Neodymium magnet 10x10x10 fit tool first, then the fixed-geometry sourcing decision report.
This route keeps geometry fixed at a 10 x 10 x 10 mm NdFeB cube. Run the tool first to classify fit, conditional, or not-fit status for temperature, corrosion, shipment, and channel assumptions. Then use the report layer to verify size-specific boundaries and RFQ-ready next actions.
1) Neodymium magnet 10x10x10 fit tool (primary interaction layer)
Geometry is fixed at 10 x 10 x 10 mm. Input duty, corrosion, shipment, and channel assumptions to get a fit classification, boundary note, and immediate next actions.
No result yet
Run the tool to generate fit classification, grade window, and RFQ action path.
Geometry is fixed at 10 x 10 x 10 mm, so the output answers whether this exact cube still fits your duty and route assumptions.
The output includes suitability boundaries and a fallback route when NdFeB is not a safe primary lane.
Reference run for neodymium magnet 10x10x10: fixed 10 mm cube latch/holder module with humid indoor duty, occasional sample flights, and possible mixed industrial / aftermarket distribution.
- Geometry fixed: 10 x 10 x 10 mm cube
- Target flux density: 760 mT
- Max operating temp: 90C
- Peak temp: 108C
- Corrosion exposure: Humid indoor with periodic hand contact during service
- Shape complexity: Standard cube geometry
- Shipment lane: Mixed air + surface lanes
- Channel scope: Mixed industrial + consumer-adjacent spare-part paths
Observed output: Typical output is "Conditional fit": the 10 mm cube remains viable, but release depends on temperature-class confirmation, coating validation for humidity / handling, and package-field plus channel-scope checks before final PO.
Why this matters: This keeps the exact-size query actionable. Users are not asking about neodymium magnets in general; they need to know whether a fixed 10 mm cube is still safe, practical, and RFQ-ready under their actual route assumptions.
2) Report summary (decision-ready conclusions)
These cards summarize the key decisions, core numbers, and applicability boundaries so teams can align quickly.
Run tool
Confidence is calculated after thermal/corrosion/shape penalties.
Pending result
Adjusted value includes environment, geometry, and compliance penalties before class mapping.
Pending result
Uses max(adjusted peak, adjusted operating + 8C) so sustained-duty risk is not hidden by transient-only checks.
28-53 MGOe
Source: [S11] plus supplier datasets; usable output still depends on load-line, geometry, and temperature.
35%-40% N-1 coverage
Source: [S4], 2035 shock scenario for graphite + rare earth elements. Use contingency lanes before RFQ freeze.
100% U.S. net reliance (2025)
Source: [S2] heavy rare earth chapter. High-temperature programs should disclose Dy/Tb exposure assumptions.
10 x 10 x 10 mm
Route holds geometry constant. Derived facts: 1 cm3 volume, 100 mm2 per face, and 600 mm2 total pre-coating surface area.
7.6 g | about 37.3 N | N42
Source: [S88]. Exact-size stock reference uses Ni-Cu-Ni coating, +/-0.1 mm tolerance, and 80C max working temperature.
10 mm cube clearly fits CPSC fixture
Sources: [S91][S20]. Geometry screening is straightforward; flux-index evidence is still required before consumer-route decisions.
Different size -> use block/custom route
If length, width, thickness, or tolerance class changes materially, stop treating this page as final-fit proof and move to a block/custom RFQ lane.
- Engineering teams defining first-pass material lanes before RFQ.
- Procurement teams that need explicit evidence gates before supplier ranking.
- Programs balancing compact size requirements with thermal and corrosion boundaries.
- Teams expecting universal grade answers without duty-cycle evidence.
- Projects that cannot execute minimum thermal/corrosion validation.
- Cost-only sourcing workflows with no fallback lane definition.
2.5) Stage1b gap audit and information deltas
This audit captures where stage1-primary coverage was thin, what evidence was added in stage1b, and which items still need project-specific confirmation.
| Gap identified | Why it was weak | Stage1b information delta | Current state | Source ref |
|---|---|---|---|---|
| Air-shipment compliance blind spot | Stage1-primary emphasized material fit but did not include the package-level magnetic field threshold that can block aircraft carriage. | Added U.S. air-carriage threshold details, decision implications, and minimum logistics actions in key numbers, policy, and open-gap sections. | Closed for first-pass planning; shipment-level field measurement remains mandatory before booking. | [S19] |
| Consumer safety scope ambiguity | Earlier copy focused on industrial sourcing and did not define when consumer magnet safety rules override pure performance screening. | Added 16 CFR hazard criteria, injury context, and FAQ guidance for consumer-channel scope screening. | Closed for U.S. compliance framing; SKU-level exemption interpretation still requires legal/compliance review. | [S20][S21] |
| Recycling vs concentration tradeoff density | The page discussed concentration risk but lacked a concrete demand-versus-secondary-supply baseline for 2024. | Added IEA demand, secondary supply, and concentration figures plus an explicit inferred-ratio label (~30%). | Partially closed; refresh required with each new IEA data cycle. | [S22] |
| US trigger timing visibility | Policy timing focused mainly on EU lanes and omitted immediate U.S. shipment and consumer-rule triggers. | Extended policy matrix with U.S. transport and consumer-safety triggers, each mapped to executable minimum actions. | Closed as of 2026-02-19; monitor CFR updates for scope changes. | [S19][S20] |
| Exact 10 mm cube benchmark lacked an auditable numeric anchor | Stage1-primary kept geometry fixed but still explained the route mostly through generic NdFeB boundaries, without a current public benchmark for an actual 10 x 10 x 10 mm cube. | Added an exact cube benchmark (N42, Ni-Cu-Ni, 7.6 g, about 37.3 N, 80C max) plus a density-based mass cross-check so the route has a size-specific data anchor. | Closed as of 2026-03-22; the stock benchmark is now explicit, but final assembly force still needs fixture-specific validation. | [S88][S89] |
| Temperature escalation logic for the fixed cube was under-specified | Earlier copy implied a high-temp fallback was needed but did not show what changes when a 10 mm cube must stay in the same envelope above 80C. | Added a same-family N42 temperature ladder (80C, 100C, 120C, 150C) and tied it to a stock-vs-custom decision rule for the exact cube. | Partially closed; final 10 mm cube approval above 80C still requires custom BH-curve and duty-cycle evidence. | [S89] |
| Coating advice stayed too generic for a hand-carried 10 mm cube route | The page warned about corrosion, but it did not show comparative coating choices or the published limit that stock Ni-Cu-Ni is not robust enough for continuous outdoor use. | Added a coating comparison baseline, explicit outdoor/humidity/hydrogen boundaries, and a warning that salt-fog figures remain comparative rather than lifecycle proof. | Partially closed; continuous outdoor, washdown, and chipped-coating life still require project-level testing. | [S88][S89][S90] |
| Consumer and air-shipment screening looked generic rather than cube-specific | Prior copy referenced consumer and shipment risk, but it did not make clear that a 10 mm cube obviously fits the small-parts fixture and still needs flux-index plus package-field evidence. | Added the small-parts cylinder dimensions, the aircraft threshold, and explicit open-data rows showing where public evidence still ends and testing must begin. | Partially closed; product-scope interpretation, flux-index evidence, and shipment-ready package measurement remain execution tasks. | [S91][S92][S93] |
Stage1b evidence refresh completed on 2026-03-22. Re-check U.S. transport, consumer-safety, and IEA concentration datasets at each quarterly compliance review.
3) Key numbers and scope boundaries
Numeric claims are disclosed with date markers. Unknown or uncertain items are explicitly labeled to avoid false certainty.
| Metric | Value | Date marker | Decision implication | Source ref |
|---|---|---|---|---|
| U.S. rare-earth concentrate output (REO) | 51,000 t and USD 240M | USGS MCS 2026 chapter, published 2026-02 | Shows domestic output scale but not full self-sufficiency for downstream NdFeB supply chains. | [S1] |
| U.S. imports of RE compounds/metals | +169% volume in 2025; value USD 165M vs USD 168M in 2024 | USGS MCS 2026 chapter, published 2026-02 | Procurement risk is driven by product mix and category shifts, not only by headline import value. | [S1] |
| World rare-earth production estimate | 390,000 t in 2025 | USGS MCS 2026 foreword (published 2026-02) | Global supply expanded, but growth does not remove concentration and policy-shock exposure. | [S3] |
| Heavy rare-earth net import reliance (U.S.) | 100% in 2025 (compounds and metals) | USGS MCS 2026 heavy rare earths chapter, published 2026-02 | High-temperature NdFeB lanes can inherit geopolitical and licensing risks through Dy/Tb exposure. | [S2] |
| Rare-earth demand change in STEPS | +50% to +60% by 2040 | IEA Global Critical Minerals Outlook 2025 | Even moderate scenario growth keeps pressure on magnet-material qualification and sourcing plans. | [S4] |
| China projected refining share (battery-grade graphite + rare earths) | Around 80% in 2035 | IEA Global Critical Minerals Outlook 2025 | Dual-lane sourcing should start before RFQ freeze for high-risk temperature classes. | [S4] |
| N-1 supply coverage for graphite + rare earths | Only 35% to 40% of N-1 demand in 2035 | IEA Global Critical Minerals Outlook 2025 | Single-country disruption can invalidate otherwise "balanced" supply assumptions. | [S4] |
| Salt spray as field-life predictor | Seldom correlates when used as stand-alone data | ASTM B117-26, last updated 2026-01-19 | Do not convert fog-test hours directly into service-life commitments without corroborating evidence. | [S10] |
| U.S. net import reliance (RE compounds/metals) | About 67% in 2025 (down from >90% in 2024) | USGS MCS 2026 Rare Earths chapter, published 2026-02 | Dependence improved versus 2024, but import exposure remains high enough to require dual-lane planning. | [S14] |
| U.S. apparent consumption (RE compounds/metals) | 27,000 t REO in 2025 vs 9,010 t in 2024 | USGS MCS 2026 Rare Earths chapter, published 2026-02 | Demand rebound can compress lead-time buffers if RFQ and validation gating are delayed. | [S14] |
| China share of U.S. RE imports by value | Average 71% (2021-2024) | USGS MCS 2026 Rare Earths chapter, published 2026-02 | Country concentration remains material for NdFeB programs even when domestic mine output increases. | [S14] |
| Rare-earth oxide price dispersion (2025, China market) | NdPr +25% ($55->69/kg), Tb +24% ($812->1,010/kg), Dy -7% ($257->239/kg) | USGS MCS 2026 Rare Earths + Heavy Rare Earths chapters | Do not treat heavy-RE exposure as one blended surcharge; element-specific terms are safer for contracts. | [S14][S15] |
| Chinese permanent-magnet exports | About 58,000 t in 2024 | IEA commentary on export controls, published 2025-12-04 | Short approval delays can rapidly affect downstream inventories when market dependence is high. | [S16] |
| EU strategic benchmark package (CRMA) | 2030 targets: 10% extraction, 40% processing, 25% recycling, <=65% single-country dependency | Regulation (EU) 2024/1252, effective 2024-05-23 | EU-facing RFQs should include origin traceability and recycling disclosure gates before final award. | [S12] |
| Air carriage magnetic-field limit (U.S.) | >0.00525 gauss at 4.5 m from any package surface is forbidden | FAA PackSafe page last updated 2023-03-15; eCFR current to 2026-03-19 | Technical fit alone does not guarantee ship readiness; package-field checks must be part of launch gating. | [S19] |
| U.S. consumer magnet hazard threshold | Hazard criteria include small-part fit plus flux index >=50 kG2 mm2; subject products must stay below 50 | 16 CFR part 1262 current text, accessed 2026-02-19 | Consumer-facing loose-magnet products need compliance screening before using catalog strength claims in go-to-market plans. | [S20] |
| U.S. high-powered magnet injury baseline | Estimated 26,600 emergency-department visits (2010-2021) and 7 reported deaths | 16 CFR part 1262 findings and CPSC final-rule release (2022) | If magnets can become loose parts, safety risk can dominate material-choice logic even when force targets are met. | [S20][S21] |
| Rare-earth demand vs secondary supply (2024, STEPS) | 91 kt demand vs 27 kt secondary supply (~30%, inferred) | IEA rare-earth data page, updated 2025-05-21 | Secondary supply helps but does not replace primary extraction and refining resilience planning. | [S22] |
| Top-three concentration (2024, STEPS) | Mining 86%; refining 97% | IEA rare-earth data page, updated 2025-05-21 | Supplier-count diversification can still mask concentration risk if upstream refining remains highly clustered. | [S22] |
| 10 mm cube stock benchmark (exact-size proxy) | 10 x 10 x 10 mm, +/-0.1 mm, 7.6 g, N42, Ni-Cu-Ni, approx. 37.3 N hold force | Supermagnete W-10-N data sheet, last updated 2026-03-22 | Useful as an auditable exact-size benchmark. Do not treat catalog hold force as final assembly force without fixture and gap disclosure. | [S88] |
| 1 cm3 cube mass cross-check | Dexter density 7.4-7.8 g/cm3 implies about 7.4-7.8 g for a 10 mm cube; catalog sample is 7.6 g | Dexter NdFeB page accessed 2026-03-22 + Supermagnete W-10-N updated 2026-03-22 | This is an inference from public density data plus exact cube volume. It helps catch quote-sheet mistakes in weight, pack count, and freight calculations. | [S89][S88] |
| N42-family temperature upgrade path | N4212 80C / N4216 100C / N4217 120C / N4220 150C max operating temp; Br steps from 13.5 to about 13.0 kG | Dexter NdFeB page accessed 2026-03-22 | If required operating temp exceeds 80C, stock N42 cube data is no longer the right proxy; request a custom high-coercivity quote and re-check magnetic reserve. | [S89] |
| Sintered NdFeB coating comparison baseline | Ni-Cu-Ni >20 um / >120 h / <200C; Parylene-C >7 um / >120 h / <250C; E-Cote >25 um / >120 h / <150C | Dexter coating-options PDF accessed 2026-03-22 | A coating change can solve one constraint and create another. Choose by humidity, handling, and temperature together, not by coating name alone. | [S90] |
| Small-part geometry screen for a 10 mm cube | CPSC small-parts cylinder is 57.10 mm long x 31.70 mm wide; a 10 mm cube clearly fits | CPSC small-parts guidance PDF, published 2023-03 | If the magnet can become an accessible loose part, small-part screening is triggered by geometry alone. Flux index still needs test or supplier data. | [S91][S20] |
| Air-carriage hard gate for packaged magnets | >0.00525 gauss at 4.5 m from any package surface cannot fly by aircraft | FAA PackSafe last updated 2023-03-15; eCFR current to 2026-03-19 | One loose 10 mm cube and a multi-pack carton do not share the same shipment status. Measure the shipment-ready package, not the part in isolation. | [S92][S93] |
Note: Grade suffix windows shown here are supplier planning conventions. Final qualification always depends on measured magnetic curves, thermal reserve checks, and application-specific validation.
Evidence refresh timestamp for this section: 2026-03-22.
Share your duty profile, shipment lane, and channel assumptions. We will return an RFQ-ready action list with fallback triggers.
3.5) Policy and compliance trigger matrix (neodymium route)
This section adds time-bound regulatory and market triggers that materially change NdFeB procurement decisions for EU-facing and globally exposed programs.
| Trigger | What changed | Timing | Sourcing impact | Minimum action | Source ref |
|---|---|---|---|---|---|
| EU strategic benchmark gate (CRMA Article 5) | EU defines 2030 targets: >=10% extraction, >=40% processing, >=25% recycling, and <=65% single-country dependency. | Regulation in force since 2024-05-23; benchmark horizon is 2030. | EU-bound programs need upstream origin transparency and backup processing lanes earlier in the RFQ cycle. | Request country-of-processing disclosure and contingency sources before price-only negotiations. | [S12] |
| Permanent-magnet label and digital data carrier (CRMA Article 28) | Products containing permanent magnets in covered categories must carry recycler-readable labels and a data carrier. | Delegated act due by 2026-11-24; obligations apply two years after delegated act enters into force. | Packaging and traceability workflows may need redesign if label/data fields are not planned upfront. | Insert label-readiness clauses in supplier agreements and reserve packaging change budget before SOP. | [S13] |
| Recycled-content statement for magnets (CRMA Article 29) | For products with >0.2 kg permanent magnets, recycled-content share for Nd, Dy, Pr, Tb and related elements must be disclosed. | Applies from 2027-05-24 or two years after delegated methodology act, whichever is later. | Quotes without elemental recycled-content accounting can become non-comparable for EU programs. | Add recycled-content traceability fields to RFQ templates and require method disclosure with each quote revision. | [S13] |
| 2025 export-control disruption window | IEA reports licensing restrictions and approval bottlenecks after China export-control tightening in 2025. | Controls announced 2025-04 and extended by 2025-10; approvals remained constrained through 2025-11. | Single-lane NdFeB sourcing can face abrupt lead-time shocks even when nominal capacity exists. | Define trigger-based switch rules (lead time, surcharge, and element exposure) before final supplier award. | [S15][S16] |
| Corrosion test comparability gate | ISO 9227 and IEC 60068-2-11 define controlled salt-mist methods, but they remain comparative screening tools rather than direct field-life predictors. | ISO 9227 published 2022-08; IEC 60068-2-11 updated 2021-06-17; ASTM B117 current revision 2026-01-19. | Quote claims based only on fog-test hours can overstate lifecycle confidence across real media and duty cycles. | Require combined corrosion + thermal-cycle validation criteria in RFQ instead of accepting stand-alone salt-spray hours. | [S10][S17][S18] |
| U.S. air-carriage magnetized-material gate | FAA PackSafe and 49 CFR 173.21(d) align on the aircraft carriage limit of >0.00525 gauss at 4.5 m from any package surface. | FAA page last updated 2023-03-15; eCFR current to 2026-03-19. | High-strength packages can require shielding redesign or route changes even after technical material fit is approved. | Add package-field measurement records to logistics release checklists before air-freight booking. | [S19] |
| U.S. consumer loose-magnet safety gate | 16 CFR part 1262 defines hazardous consumer magnet products by small-part fit and flux index threshold; CPSC attributes major injury burden to this category. | Effective since 2022-10-21; current text accessed 2026-02-19. | Consumer-facing SKUs can fail compliance even when engineering pull-force targets are met. | Screen product scope and flux-index risk before tooling and packaging lock for consumer channels. | [S20][S21] |
| Pending item | Current status | Impact | Minimum action | Source ref |
|---|---|---|---|---|
| CRMA Article 28 magnet-label implementation template | Pending delegated act text (deadline 2026-11-24). As of 2026-02-18, no reliable public final label template is available. | Teams may under-scope packaging, serialization, or data-carrier changes if they wait for late-stage interpretation. | Track Official Journal updates monthly and require suppliers to provide draft label/data payload mapping in advance. | [S13] |
| CRMA Article 29 recycled-content calculation method | Delegated methodology act is due by 2026-05-24; as of 2026-02-18, no reliable public finalized method text is available. | Supplier recycled-content declarations may use inconsistent assumptions, reducing quote comparability. | Ask each supplier for current method assumptions and third-party verification path until EU method is finalized. | [S13] |
| Part-level Dy/Tb intensity for specific commercial grades | No reliable public open dataset; supplier formulas are typically confidential and program-specific. | Element-specific price and export-license exposure can remain hidden until late quote revisions. | Use NDA-backed composition range disclosure and element-indexed surcharge clauses before committing long-horizon POs. | [S15] |
| Carrier-specific acceptance workflow for magnetized packages | No single reliable public cross-carrier template; regulatory thresholds are clear but acceptance workflows vary by route and operator. | Programs can hit late booking friction even after in-house technical and compliance reviews pass. | Collect route-specific carrier checklists and sample package-field evidence before ramp milestones. | [S19] |
Pending labels use explicit status wording when no reliable public implementation text is available as of 2026-03-22.
4) Methodology
The method combines technical feasibility and sourcing execution in one path so output can directly drive next actions.
Step 1 - Convert max and peak temperatures into planning duty
For this neodymium magnets route, the tool adjusts both max operating and peak temperatures, then applies an 8C planning guard band on sustained duty.
Step 2 - Gate against thermal class and flux demand
Planning duty maps to N/AH planning windows while requested flux density screens for sintered, bonded, or fallback routes.
Step 3 - Add coating and validation burden
Corrosion exposure determines coating stack and required validation evidence before RFQ lock.
Step 4 - Produce action path with confidence
The output reports confidence, risk rows, and next actions so teams can move directly into RFQ or fallback planning.
5) Data sources and evidence trail
Every key conclusion maps to a source and date marker so reviewers can validate or challenge assumptions quickly.
| Ref | Source | Signal used on this page | Date marker |
|---|---|---|---|
| S1 | USGS MCS 2026 - Rare Earths chapter | Reports U.S. REO concentrate output (51,000 t, USD 240M) and import shift (+169% volume; value USD 165M vs USD 168M in 2024). | Published 2026-02 |
| S2 | USGS MCS 2026 - Heavy Rare Earths chapter | Shows U.S. net import reliance at 100% in 2025 and documents 2025 export-control timeline affecting heavy rare earths. | Published 2026-02 |
| S3 | USGS Mineral Commodity Summaries 2026 (foreword) | States world rare-earth production estimate reached 390,000 tons in 2025. | Manuscript approved 2026-02-06 |
| S4 | IEA Global Critical Minerals Outlook 2025 | Rare-earth demand rises 50%-60% by 2040 in STEPS; China around 80% refining share in 2035; N-1 coverage for graphite + rare earths only 35%-40%. | Published 2025 |
| S5 | DOE Critical Materials Assessment 2023 | Executive summary states Nd, Pr, Dy, Tb used in EV motor and wind generator magnets continue to be critical. | Published 2023-07-31 |
| S6 | IEC 60404-5:2015 | Defines measurement methods for magnetic flux density, polarization, field strength, demagnetization curve, and recoil line for permanent magnets. | Publication date 2015-04-16 |
| S7 | IEC 60404-8-1:2023 | Specifies minimum magnetic-property values and dimensional tolerances for magnetically hard materials, including updated REFeB grades. | Publication date 2023-09-20 |
| S8 | IEC 60404-18:2025 | Defines open-circuit superconducting-magnet methods (SCM-VSM and SCM-extraction) and self-demagnetizing-field corrections. | Publication date 2025-02-20 |
| S9 | IEC TR 62518:2009 | Details flux-loss behavior of Nd-Fe-B and SmCo sintered magnets from 50C to 200C for up to 1000 h; explicitly excludes corrosion-coupled stability modeling. | Publication date 2009-03-17 |
| S10 | ASTM B117-26 | Defines salt-spray apparatus as a controlled comparative test and warns that stand-alone correlation to natural environment is seldom reliable. | Last updated 2026-01-19 |
| S11 | Review paper on bonded NdFeB (Journal of Alloys and Compounds 2025) | Notes isotropic bonded NdFeB is often <=16 MGOe while anisotropic bonded routes can approach ~25 MGOe. | Published 2025-07-15 |
| S12 | Regulation (EU) 2024/1252 (CRMA), Article 5 | Sets 2030 EU benchmarks: >=10% extraction, >=40% processing, >=25% recycling, and <=65% single-country dependency at each strategic stage. | Entered into force 2024-05-23 |
| S13 | Regulation (EU) 2024/1252 (CRMA), Articles 28-29 | Defines permanent-magnet labeling/data-carrier obligations and recycled-content statement requirements for Nd, Dy, Pr, Tb and related elements. | Entered into force 2024-05-23 |
| S14 | USGS MCS 2026 - Rare Earths chapter | Reports U.S. 2025 net import reliance at about 67%, consumption at 27,000 t REO, China import share averaging 71% (2021-2024), and NdPr oxide rising from $55/kg to $69/kg in 2025. | Published 2026-02 |
| S15 | USGS MCS 2026 - Heavy Rare Earths chapter | Documents 2025 export-control timeline for seven medium/heavy rare-earth items; terbium oxide increased from $812/kg to $1,010/kg while dysprosium oxide declined from $257/kg to $239/kg. | Published 2026-02 |
| S16 | IEA commentary: China’s export restrictions and strategic responses | Notes roughly 58,000 t Chinese permanent-magnet exports in 2024 and reports 2025 licensing disruptions affecting downstream inventories. | Published 2025-12-04 |
| S17 | ISO 9227:2022 Corrosion tests in artificial atmospheres | Defines NSS/AASS/CASS test methods and warns that salt-spray performance does not translate directly into corrosion behavior in other environments. | Published 2022-08 |
| S18 | IEC 60068-2-11:2021 Environmental testing - Test Ka | Provides an electrotechnical salt-mist test protocol used for comparative corrosion qualification and test reproducibility. | Published 2021-06-17 |
| S19 | FAA PackSafe magnets page + 49 CFR 173.21(d) | States that any package or magnet above 0.00525 gauss at 4.5 m (15 feet) from any package surface cannot fly and points to the codified DOT rule. | FAA page last updated 2023-03-15; accessed 2026-03-22 |
| S20 | eCFR 16 CFR part 1262 - Safety standard for magnets | Defines hazard criteria using small-part fit and flux index >=50 kG2 mm2, with an effective date of 2022-10-21. | Current text (last amended 2023-09-20), accessed 2026-02-19 |
| S21 | CPSC final-rule release for magnet safety | Reports estimated 26,600 emergency-department visits (2010-2021) and seven deaths linked to high-powered magnet ingestion incidents. | Published 2022-09-22 |
| S22 | IEA data: Rare earth elements supply, demand, diversification and policy support | Shows 2024 STEPS values of 91 kt demand, 27 kt secondary supply, and top-three concentration of 86% (mining) and 97% (refining). | Updated 2025-05-21 |
| S88 | Supermagnete W-10-N exact cube data sheet | Provides an exact 10 x 10 x 10 mm sintered NdFeB cube benchmark: N42, Ni-Cu-Ni, +/-0.1 mm, 7.6 g, about 37.3 N hold force, 80C max working temperature, plus nickel-allergy, corrosion, and airfreight warnings. | Data sheet last updated 2026-03-22 |
| S89 | Dexter Magnetic Technologies - Neodymium Iron Boron Magnets | Lists NdFeB density (7.4-7.8 g/cm3), oxidation and humidity limitations, hydrogen-atmosphere warning, and an N42-family ladder from 80C to 150C (N4212, N4216, N4217, N4220). | Page accessed 2026-03-22 |
| S90 | Dexter NdFeB coating-options PDF | Compares coating stacks for fully sintered NdFeB, including Ni-Cu-Ni, Parylene-C, and E-Cote thickness, salt-fog duration, and temperature ceilings. | PDF accessed 2026-03-22 |
| S91 | CPSC small-parts guidance summary (16 CFR part 1501) | Defines the small-parts test cylinder as 2.25 in (57.10 mm) long by 1.25 in (31.70 mm) wide, which a 10 mm cube clearly fits. | Published 2023-03 |
| S92 | FAA PackSafe - Magnets | States that any package or magnet above 0.00525 gauss at 4.5 m (15 feet) from any package surface cannot fly, while packages below that threshold may travel in checked or carry-on lanes. | Last updated 2023-03-15; accessed 2026-03-22 |
| S93 | eCFR 49 CFR 173.21(d) - Forbidden materials and packages | Codifies that, for carriage by aircraft, any package with a magnetic field of more than 0.00525 gauss measured at 4.5 m (15 feet) from any package surface is forbidden. | Current to 2026-03-19 |
| S94 | Arnold Magnetic Technologies - NdFeB and GBD Neo page | Shows commercial N/M/H/SH/UH/EH/AH grade ladders and notes that GBD Neo favors smaller magnets with thickness below 6 mm or laminated materials. | Page modified 2025-10-22; accessed 2026-03-22 |
Neodymium magnets evidence expansion refs [S12]-[S22] refreshed on 2026-03-22.
6) Concept boundaries and applicability rules
These boundaries are used to prevent over-interpretation of catalog labels and to define where additional evidence is mandatory.
| Boundary | Meaning | Use when | Do not use when | Source ref |
|---|---|---|---|---|
| BHmax headline is not assembly force | Energy-product labels compare material potential, not guaranteed pull force in your magnetic circuit. | Use BHmax as first-pass screening with geometry and load-line assumptions declared. | Do not rank suppliers by BHmax alone when measurement method or working point is undisclosed. | [S6][S7][S8] |
| Grade suffix is a planning shortcut | N/M/H/SH/UH/EH/AH ranges are commonly used in commerce but are not a standalone release criterion. | Use suffix classes for early lane gating before detailed BH-curve and demag checks. | Do not treat suffix labels as universal guarantees across vendors without material test disclosure. | [S6][S7] |
| Salt spray is comparative, not life prediction | Salt-fog testing helps compare coating options in controlled chambers. | Use as a screening gate with replication and clear acceptance criteria. | Do not map salt-spray hours directly to field-life commitments without corroborating long-term exposure data. | [S10] |
| High-temperature NdFeB can raise heavy-RE exposure | Programs near EH/AH lanes can become more sensitive to Dy/Tb availability and export controls. | Trigger dual-lane sourcing and fallback windows before RFQ lock when adjusted peak duty is high. | Do not assume global supply expansion alone removes element-specific licensing or concentration risks. | [S2][S4][S5] |
| Thermal stability data has defined scope | Published stability studies include specific time/temperature windows and may exclude corrosion-coupled behavior. | Use the tested windows (for example 50C to 200C, up to 1000 h) as boundary references only. | Do not extrapolate beyond reported conditions without additional testing for corrosion, duty cycling, and geometry effects. | [S9] |
| Air-shipment eligibility is package-level | Air transport screening uses measured package field at distance, not grade labels or nominal BHmax claims. | Apply before booking aircraft lanes for strong assemblies, kits, or mixed shipments. | Do not assume a magnet is flyable because the material passes engineering performance targets. | [S19] |
| Consumer magnet safety scope is conditional | U.S. 16 CFR part 1262 addresses consumer products containing hazardous loose magnets defined by size and flux index. | Use when end products can release accessible loose magnets in consumer channels. | Do not overgeneralize as a universal industrial exemption; verify product scope and exemptions first. | [S20][S21] |
| Stock 10 mm cube data sheet is a benchmark, not universal approval | The public W-10-N data sheet is a useful exact-size anchor for one sintered N42 Ni-Cu-Ni cube, not a blanket approval for every 10 mm cube program. | Use it to screen RFQs, weight assumptions, and baseline force expectations when geometry is truly fixed at 10 x 10 x 10 mm. | Do not reuse the catalog value as final force or temperature proof when fixture, gap, magnetization map, coating, or duty profile changes. | [S88][S89] |
| Ni-Cu-Ni stock plating is not a continuous-outdoor approval | Stock nickel-copper-nickel plating gives limited corrosion protection, while Dexter explicitly recommends coating when NdFeB sees humidity, salts, alkalis, acids, or harmful gases. | Use stock plating as a dry-indoor or light-humidity benchmark while you are still screening alternatives. | Do not treat stock Ni-Cu-Ni as validated for continuous outdoor, washdown, salt, alkaline, or hydrogen-atmosphere duty. | [S88][S89][S90] |
| Small-part fit is obvious; flux index is not | A 10 mm cube clearly fits the CPSC small-parts cylinder, but hazardous-loose-magnet decisions also depend on flux index and actual product scope. | Use this screen immediately when the cube can become an accessible loose magnet in consumer-adjacent or mixed-channel products. | Do not assume geometry alone decides pass or fail under 16 CFR part 1262; flux-index evidence is still required. | [S91][S20] |
| Thin-part GBD claims do not automatically transfer to a 10 mm cube | Arnold states GBD Neo favors magnets below 6 mm thick or laminated materials, so thin-part coercivity gains are not a generic 10 mm cube shortcut. | Use this boundary when a supplier tries to transfer thin-laminate or sub-6 mm high-temperature data into a fixed 10 mm cube discussion. | Do not copy GBD claims into a 10 mm cube quote without geometry-bounded evidence and lot-level validation. | [S94] |
7) Material comparison and tradeoffs
Compare material routes using reproducible dimensions instead of marketing-only descriptors.
| Decision dimension | Sintered NdFeB | Bonded NdFeB | SmCo | Comment | Source ref |
|---|---|---|---|---|---|
| Typical magnetic energy density window | 28-53 MGOe | <=16 MGOe (isotropic), up to ~25 MGOe (anisotropic) | 20-33 MGOe | Values are orientation windows from cited source sets; geometry and working point still shift usable output. | [S11] |
| Planning temperature ceiling | Commercial planning classes often run through AH around 220C (verify by curve and load-line) | Typically lower than sintered due to polymer binder constraints | Used as high-temperature fallback; IEC TR 62518 discusses elevated-temperature stability behavior | Use adjusted peak temperature, not ambient. Final limit must come from vendor curves under your duty profile. | [S9] |
| Shape freedom and manufacturing | Strong but brittle; machining tolerance management is critical | Higher shape freedom for complex and thin-wall geometries | Brittle ceramic-like behavior; machining control required | Shape complexity can justify bonded routes even when peak BHmax is lower. | [S11] |
| Corrosion baseline | Coating usually required (Ni-Cu-Ni, epoxy, or equivalent) | Binder contributes baseline protection but media compatibility must still be verified | Better inherent corrosion behavior in many environments | ASTM B117 / IEC 60068-2-11 are gate checks, not direct life models. | [S10] |
| Supply concentration exposure (2035 view) | High for Nd/Pr, and potentially Dy/Tb in high-temperature coercivity lanes | Still tied to rare-earth feedstock plus binder/process dependencies | Different critical-material exposure profile (includes cobalt) | IEA N-1 analysis shows concentration shock can leave only 35%-40% coverage for rare-earth linked chains. | [S4] |
| Measurement comparability baseline | Require demag curve + recoil line under disclosed method | Request the same measurement family and working-point disclosure | Normalize by same method before ranking across vendors | IEC 60404-5 and IEC 60404-18 describe measurement methods; IEC 60404-8-1 defines minimum property specifications. | [S6][S7][S8] |
| Best-fit program conditions | General high-flux motors, sensors, compact electromechanics | Complex geometry, high-volume molding, lower peak flux density demands | Very high-temperature or severe thermal-cycle duty | Always close loop with demag, corrosion, and thermal evidence before release. | [S5][S9] |
| Logistics and consumer-compliance friction | High-field packages can breach air-carriage thresholds; loose consumer magnet formats need explicit safety screening. | Lower energy density can reduce some package-field pressure, but product-level safety checks still apply. | No automatic exemption; package-field and end-use safety scope must still be verified. | Inference from [S11][S19][S20]: compliance is tested at package/product level, not guaranteed by material family alone. | [S11][S19][S20] |
| Exact 10 mm cube with stock-like indoor duty | Direct exact-size benchmark exists: N42 Ni-Cu-Ni, 7.6 g, and about 37.3 N hold force at 80C max. | No public 10 mm bonded-cube benchmark is used on this page; lower energy density usually means lower force or a larger magnetic volume. | Useful only when thermal or corrosion margin matters more than stock-like availability and cost. | This row anchors the route to an exact-size public proxy, but catalog hold force remains fixture-sensitive. | [S88][S11] |
| Exact 10 mm cube above 80C | Higher-coercivity N42-family lanes exist: N4216 at 100C, N4217 at 120C, and N4220 at 150C, with Br stepping down from 13.5 to about 13.0 kG. | Binder-based routes usually sacrifice temperature or force density first; use only when shape freedom offsets the magnetic penalty. | Thermal fallback remains relevant when the cube envelope must stay fixed and NdFeB margin collapses. | Counterexample to stock thinking: the same 10 mm envelope can stay NdFeB, but the stock N42 cube is no longer the right proxy once duty rises. | [S89][S9] |
| Humidity, hand contact, and outdoor exposure | Ni-Cu-Ni stock coating provides limited corrosion protection and is not robust enough for continuous outdoor use; coating changes must still respect temperature limits. | Binder can help certain corrosion paths, but aggressive media and direct-contact decisions still need article-level validation. | Intrinsic corrosion behavior can be better, but handling, cost, and system-level constraints remain. | Dexter coating figures are comparative inputs. ASTM B117 still warns against turning salt-fog hours into service-life claims. | [S88][S90][S10] |
8) Risk matrix and mitigation
Misuse risk, cost risk, and scenario mismatch risk are shown together so the team can sequence mitigation actions.
| Risk | Probability | Impact | Mitigation |
|---|---|---|---|
| Thermal misclassification versus real hotspot duty | Low | Medium | Recalculate adjusted operating + peak duty with measured cycle data and confirm class with demag-curve checks before PO. |
| Coating-lifecycle mismatch under real media exposure | Medium | Medium | Map media profile to explicit corrosion + thermal-cycle tests and define pass/fail criteria up front. |
| Supplier data non-comparability (test method mismatch) | Medium | Medium | Require method disclosure (IEC 60404 family) and normalize working points before ranking quotes. |
| High-temperature lane heavy-rare-earth exposure | Medium | Medium | When adjusted duty approaches EH/AH lanes, request Dy/Tb exposure disclosure and define export-control fallback triggers before award. |
| Supply concentration shock during launch window | High | Medium | Maintain contingency lane and pre-define switch triggers for temperature, lead time, and cost tolerance. |
| Air-lane rejection despite technical material fit | Medium | Medium | Measure shipment-ready package fields before booking, prepare shielding iterations, and pre-authorize a surface-transport fallback workflow. |
| Consumer-channel compliance mismatch | Medium | Medium | Before release, confirm whether the SKU enters consumer magnet scope, then align flux-index testing, warnings, and channel restrictions. |
9) Open evidence gaps and minimum closure path
Where public evidence is incomplete, this page does not force a hard conclusion. Each gap includes a minimal executable closure action.
| Evidence gap | Current status | Decision impact | Minimum closure action | Source ref |
|---|---|---|---|---|
| Cross-supplier suffix mapping to guaranteed demag margin | No single public standard mapping N/M/H/SH/UH/EH/AH suffix labels to guaranteed in-application demag reserve. | Quote comparisons can look equivalent while actual thermal headroom differs by method and working point. | Request vendor-specific BH curves, recoil data, and temperature conditions before release decisions. | [S6][S7] |
| Salt-spray hours to field-life conversion | No reliable universal conversion model in open standards; ASTM B117 warns stand-alone correlation is seldom robust. | Warranty and lifecycle assumptions can be overstated if fog-hour data is treated as direct service-life evidence. | Pair chamber tests with application-specific thermal/media cycling and clearly documented acceptance criteria. | [S10] |
| Corrosion-coupled high-temperature flux-loss dataset for each coating stack | Public IEC thermal-stability report excludes corrosion-coupled behavior modeling for full lifecycle prediction. | High-temperature and aggressive-media programs may underestimate long-term drift and reserve loss. | Run combined thermal + corrosion + load-line validation for each candidate stack before final PO. | [S9] |
| Program-specific heavy-rare-earth exposure breakdown | Public macro data confirms concentration risk, but part-level Dy/Tb intensity is typically supplier-confidential. | Lead-time and export-license risk can remain hidden until late sourcing stages. | Add material disclosure checkpoints and contingency triggers in RFQ templates. | [S2][S4] |
| Package-field prediction from CAD/BHmax alone | No reliable universal public model converts part-level grade and geometry into certified package-field outcomes at transport distance. | Teams can discover non-compliant shipping configurations late, after packaging design and launch schedules are locked. | Run measured package-field checks on shipment-ready units and reserve shielding iteration time before booking. | [S19] |
| Exact flux-index benchmark for a 10 mm cube | No reliable public dataset on this page publishes a verified flux-index value for the exact 10 x 10 x 10 mm cube benchmark under the ASTM F963 test method. | Teams can correctly identify the small-part screen yet still misjudge consumer hazard scope if they assume flux index from pull force or grade name alone. | Request flux-index evidence from the supplier or test the exact cube under the ASTM F963 procedure before any consumer or mixed-channel release decision. | [S88][S20][S91] |
| Package-field outcome for multi-piece 10 mm cube cartons | No reliable public model converts cube count, orientation, spacing, shielding, and box size into guaranteed <=0.00525 gauss aircraft-pass results for every package design. | A single sample cube may look flyable while the production carton still fails air carriage after packout is finalized. | Measure the shipment-ready package at the regulatory distance, version the result by packaging revision, and keep a surface-lane fallback until measurements pass. | [S92][S93] |
| Continuous outdoor or washdown life for exact 10 mm Ni-Cu-Ni cubes | No reliable public lifecycle dataset proves how an exact 10 mm nickel-plated cube survives long-duration outdoor, washdown, or mixed-handling duty after coating damage. | Programs can overstate durability if they convert stock indoor or salt-fog data into field-life guarantees. | Run project-specific corrosion plus thermal-cycle validation on the final coating stack and include damage-tolerance checks for chipped or cracked plating. | [S88][S89][S90] |
Labeling policy: when reliable public data is insufficient, status is marked as "no reliable public data" and converted into a validation task instead of a forced conclusion.
10) Scenario examples
Each scenario includes assumptions, tool outcome, and minimum executable next step.
Assumptions
Peak 145C, humid but sealed enclosure, target flux 820 mT, annual volume 120k.
Outcome
Fit: SH/UH sintered NdFeB lane with epoxy-over-Ni coating and standard validation depth.
Next step
Proceed with NdFeB primary lane and run salt-mist + thermal cycle validation before pilot freeze.
Assumptions
Peak 198C, coolant splash exposure, target flux 960 mT, annual volume 45k, automotive compliance.
Outcome
Conditional: EH/AH planning window with tighter demag reserve checks and contingency lane recommendation.
Next step
Open parallel SmCo contingency lane until demag and corrosion evidence both pass program criteria.
Assumptions
Peak 238C, high corrosion medium, target flux 680 mT, low annual volume, medical-grade audit controls.
Outcome
Not fit: adjusted thermal duty exceeds AH planning envelope for NdFeB.
Next step
Prioritize SmCo fallback or architecture redesign before spending cycle budget on high-risk NdFeB trials.
Assumptions
Peak 172C, humid industrial floor, target flux 910 mT, annual volume 80k, products destined for EU compliance lanes.
Outcome
Conditional: NdFeB is technically feasible but procurement path is gated by CRMA traceability and recycled-content disclosure readiness.
Next step
Hold dual-source lane and lock supplier traceability payload (origin + recycled content assumptions) before line-freeze milestone.
Assumptions
Fixed 10 x 10 x 10 mm cube, dry indoor duty, peak 70C, industrial-only channel, and no air-priority shipment requirement.
Outcome
Fit: the public stock benchmark can anchor a first-pass NdFeB lane because the route stays inside the published 80C and dry-indoor envelope.
Next step
Normalize pull-force test method, lock geometry/tolerance scope, and request lot-level orientation plus coating declarations before PO release.
Assumptions
Fixed 10 mm cube, humid indoor duty, periodic hand contact, peak 92C, mixed air + surface sample lanes, and possible aftermarket spare-part exposure.
Outcome
Conditional: geometry remains viable, but the stock N42 cube is no longer a sufficient proxy for temperature, coating, shipment, or channel decisions.
Next step
Request a higher-temperature exact-size quote, compare coating stacks, measure the shipment-ready package field, and screen consumer scope before launch.
Assumptions
The same 10 mm cube is proposed for continuous outdoor splash or 130C duty, with a chance of becoming an accessible loose spare part.
Outcome
Not fit for stock-like release: the public cube benchmark breaks at corrosion, temperature, and consumer-risk boundaries even though geometry remains fixed.
Next step
Move to a custom NdFeB or SmCo fallback lane, then build a validation plan covering coating life, flux index, and package-field measurement before RFQ freeze.
11) FAQ (decision-focused)
Questions are grouped by decision intent so teams can move from explanation to execution.
12) Next action
Share your duty profile and we will return a material-lane recommendation with grade window, coating strategy, validation checklist, and RFQ normalization notes.
Product Gallery
10 mm cube and block-style NdFeB planning geometry
Specifications
| Fixed geometry | 10 x 10 x 10 mm square NdFeB cube/block with 1:1:1 aspect ratio |
| Published stock benchmark | N42, Ni-Cu-Ni, 7.6 g, approx. 37.3 N hold force, 80 C max working temperature (source refreshed 2026-03-22) |
| Derived geometry facts | 1 cm3 volume, 100 mm2 per face, and 600 mm2 total surface area before coating |
| Typical planning lane | Sintered NdFeB in N35-N52 range for standard duty; H/SH/UH fallback when planning temperature rises |
| Coating planning | Ni-Cu-Ni baseline for dry/light-duty lanes; upgrade or validate for humid, splash, salt, or skin-contact-adjacent routes |
| Best-fit use pattern | Compact fixtures, latches, holders, demonstrators, and modules where a 10 mm cube is still the final geometry |
| Release rule | Do not award volume lots until temperature class, coating scope, package-field behavior, and channel intent are normalized in the RFQ pack |
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Reference Guides
Procurement-ready guides covering grades, coatings, QC, and RFQ prep.
Coatings & Corrosion
Corrosion protection for rare earth magnets
Environment-based guidance for selecting coatings and corrosion controls.
Manufacturing & Quality
Inspection and testing for NdFeB magnets
How to define inspection scope, measurement methods, and acceptable criteria.
Sourcing & Logistics
Magnet storage and handling safety
Storage, handling, and packaging guidance to avoid chipping, demagnetization, and injury.
Case studies
HVAC - Linear actuator assemblies
Block Magnets for HVAC Linear Actuator Production Line
Scaling from 500 to 10,000 pcs/month of N35 block magnets for HVAC damper actuators while reducing unit cost by 18%.
Subsea / Marine - Magnetic coupling for ROV thrusters
Magnetic Assembly for Underwater ROV Thruster Coupling
Custom magnetic coupling assembly using N42 NdFeB ring magnets with epoxy coating for subsea ROV thruster applications.
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Spec sheet downloads
Reference assets to speed up RFQ prep. Confirm specs before ordering.
NdFeB spec sheet (reference)
Grades, coatings, and RFQ checklist for NdFeB magnets.
SmCo spec sheet (reference)
High-temperature SmCo summary and RFQ checklist.
Ferrite spec sheet (reference)
Cost-optimized ferrite basics and RFQ checklist.
Alnico spec sheet (reference)
High-temperature Alnico grades and RFQ checklist.
Bonded NdFeB spec sheet (reference)
Bonded NdFeB process notes and RFQ checklist.
Flexible rubber magnet spec sheet (reference)
Flexible magnet tape basics and RFQ checklist.
Magnetic assembly spec sheet (reference)
Pot magnet assembly fundamentals and RFQ checklist.
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