NdFeB Magnet Grades: Run the selector first, then review the full evidence report.
Start with the grade selector to classify whether the requested grade lane is fit, conditional, or not fit for your duty profile. Then use the report layers to verify method, boundaries, data sources, and fallback strategy before RFQ lock.
1) NdFeB grade selector (primary interaction layer)
Input duty conditions and constraints. The tool returns fit classification, route recommendation, boundary note, and immediate next actions.
No result yet
Run the tool to generate fit classification, grade window, and RFQ action path.
The output includes suitability boundaries and a fallback route when NdFeB is not a safe primary lane.
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.
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.
- 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.
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. import-source concentration (rare-earth compounds/metals) | China 71%, Malaysia 13%, Japan 5%, Estonia 5% (2021-24) | USGS MCS 2026 chapter, published 2026-02 | Single-origin dependency remains material for NdFeB programs even when aggregate import value looks stable. | [S1] |
| Heavy-RE import-source concentration signal | Terbium 100% China; Holmium 100% China; Lutetium 100% China | USGS MCS 2026 heavy-RE chapter (2021-24 shipping records) | Programs that depend on heavy-RE-enabled coercivity lanes should not assume diversified upstream availability. | [S2] |
| China medium/heavy RE export-control trigger | Announcement No.18 issued and effective 2025-04-04, licensing required for listed items | MOFCOM + GACC announcement, 2025-04-04 | RFQ assumptions need explicit license-path checks for Tb/Dy-related NdFeB lanes before launch freeze. | [S12] |
| EU CRMA 2030 benchmark package | 10% extraction, 40% processing, 25% recycling, <=65% single-country dependency | EU policy references published 2024; benchmark horizon 2030 | EU-facing programs increasingly require sourcing plans that show diversification and regional processing options. | [S13][S14] |
| U.S. mine-to-magnet policy signal (2025) | $150M heavy-RE separation loan (2025-08-10) + $5.1M recycling award (2025-01-17, est. 50 t/y REO) | U.S. Department of Defense releases in 2025 | Domestic capacity expansion is underway but still transitional; contingency lanes remain necessary for near-term programs. | [S15][S16] |
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: 2026-02-18.
4) Policy and licensing timeline (2024-2026)
Procurement assumptions can break when control status changes inside a qualification cycle. This timeline converts policy events into executable sourcing actions.
| Date | Event | Why it matters | Minimum sourcing action | Source ref |
|---|---|---|---|---|
| 2024-03-18 | Council of the EU gave final approval to the Critical Raw Materials Act (CRMA). | Sets EU benchmark direction (10/40/25) and formalizes supply-chain risk assessment pressure for strategic-material users. | For EU-bound programs, add a diversification narrative and permit-path assumptions in supplier scorecards. | [S14] |
| 2025-04-04 | China MOFCOM + Customs issued Announcement No.18 and made it effective on issuance date. | Listing includes medium/heavy rare-earth items and Tb/Dy-related NdFeB permanent magnet materials under export-control licensing. | Add license-path checkpoints and fallback-lane triggers before RFQ lock, not after PO issue. | [S12] |
| 2025-08-10 | U.S. DoD Office of Strategic Capital announced a $150 million loan to MP Materials for heavy-RE separation capability. | Signals domestic capacity buildout, but this is a transition-stage intervention rather than immediate full self-sufficiency. | Treat domestic-lane gains as medium-term upside and keep near-term dual-lane procurement buffers. | [S15] |
| 2025-10 to 2025-11 | USGS reports China expanded rare-earth controls in October and suspended the October expansion for one year in November while April controls remained active. | Policy status can change within one program cycle, so static sourcing assumptions age quickly. | Set contract language for policy-trigger reviews (quarterly minimum) and maintain clear escalation owners. | [S1][S2] |
| 2026-02 | USGS MCS 2026 refresh published 2025 data on output, imports, and concentration signals. | Confirms heavy import reliance and concentration indicators remain decision-critical for high-temperature lanes. | Refresh risk register with latest MCS values each planning cycle before supplier award decisions. | [S1][S2] |
Timeline refresh timestamp: 2026-02-18. Where official cycle-time distributions are unavailable, this page marks the item as "no reliable public data" instead of hard-coding assumptions.
5) Methodology
The method combines technical feasibility and sourcing execution in one path so output can directly drive next actions.
Step 1 - Convert inputs into adjusted peak duty
Tool applies environmental, geometry, and certification penalties to convert user-entered peak temperature into planning duty.
Step 2 - Gate against suffix windows and flux demand
Adjusted peak 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.
| Model parameter | Rule used in tool | Operational implication |
|---|---|---|
| Corrosion penalty | Indoor +0C, humid +9C, salt/aggressive media +18C | Higher media stress pushes grade lane upward and increases coating validation burden. |
| Geometry penalty | Standard +0C, complex +6C, micro/thin-wall +12C | Complex or micro geometry raises demag risk and may trigger bonded-route evaluation. |
| Compliance penalty | Standard +0C, automotive +6C, medical +9C | Regulated lanes require tighter evidence and process controls before release. |
| Cost-priority confidence offset | Cost-first mode applies an additional confidence reduction | Prevents overconfident decisions when budget pressure conflicts with thermal/corrosion risk. |
| Low-volume penalty | Annual volume below 3,000 units adds confidence reduction | Lower volume can reduce supplier process stability and increase variation risk. |
Scope note: these penalties are screening assumptions for this page tool, not a substitute for FEM, bench demag curves, or supplier CoA review.
6) 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 | MOFCOM + GACC Announcement No.18 of 2025 | Issued 2025-04-04 and effective immediately; adds export control items including Tb/Dy-containing NdFeB permanent magnet materials and requires export licensing for controlled items. | Issued 2025-04-04 |
| S13 | European Commission - Critical Raw Materials Act | States 2030 benchmarks: 10% extraction, 40% processing, 25% recycling, and <=65% of each strategic raw material from a single third country at relevant processing stages. | Policy page accessed 2026-02-18 |
| S14 | Council of the EU - CRMA final approval release | Final approval on 2024-03-18, confirms 10/40/25 benchmarks and states regulation enters into force on the 20th day after Official Journal publication. | Published 2024-03-18 (last review 2025-01-30) |
| S15 | U.S. Department of Defense - OSC loan release | Announces $150 million loan (2025-08-10) to add heavy rare-earth separation capability at Mountain Pass. | Published 2025-08-10 |
| S16 | U.S. Department of Defense - REEcycle award release | Announces $5.1 million award (2025-01-17); cites estimated 50 tons/year rare-earth-oxide production and >98% recovery for Nd, Pr, Dy, and Tb. | Published 2025-01-17 |
7) 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] |
| Policy conditions can shift faster than qualification cycles | 2025 timeline shows control scope changes across months while earlier controls remained active. | Freeze sourcing checkpoints (license status, lead-time buffer, fallback lane) at each major gate review. | Do not assume prior-quarter export-control status will remain unchanged through SOP without revalidation. | [S1][S2][S12] |
8) 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] |
| Licensing and policy-shock exposure (2025+) | High-temperature lanes may involve Tb/Dy-sensitive supply paths that can face export-license friction. | Exposure depends on feedstock chemistry, but medium/heavy-RE licensing signals can still propagate upstream. | Samarium-cobalt permanent magnet materials are explicitly listed in China Announcement No.18. | Treat policy status as a qualification variable and predefine fallback triggers before RFQ freeze. | [S12][S1][S2] |
| EU localization and diversification pressure (2030 horizon) | May need stronger EU-adjacent processing/disclosure plans for long-cycle programs. | Can help some geometry/processing flexibility but still requires diversified raw-material pathways. | Alternative chemistry route, yet still needs country-concentration checks and permit assumptions. | CRMA benchmarks (10/40/25 and <=65% single-country dependency) are planning constraints, not marketing labels. | [S13][S14] |
| 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] |
9) 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 peak with measured duty cycle 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. |
10) 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] |
| License approval lead-time distribution after Announcement No.18 | No reliable public, machine-readable dataset publishes approval-cycle distributions by element or destination (as of 2026-02-18). | Programs can under-budget or over-buffer schedule risk when assuming fixed export-license lead-time uplifts. | Collect supplier-specific license evidence (submission date, approval date, item scope) and keep dual-lane triggers active. | [S12] |
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.
11) 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.
12) FAQ (decision-focused)
Questions are grouped by decision intent so teams can move from explanation to execution.
13) 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.
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