Materials & Grades
Temperature ratings and demagnetization risk
Understand temperature classes, irreversible loss risk, and how to specify grades for thermal stability.
Last updated on 2026/01/26
Why temperature ratings matter
NdFeB strength can drop as temperature increases. Exceeding a magnet's limit may cause irreversible loss, especially under load.
Temperature classes in practice
Grade suffixes indicate higher temperature capability. Common suffixes include M, H, SH, UH, EH, and AH. The suffix often matters more than the N-number for thermal stability.
Demagnetization risk factors
- Elevated operating temperature or thermal spikes.
- Reverse fields from neighboring magnets or assemblies.
- Thin cross-sections or complex magnetization patterns.
RFQ guidance
- Provide operating temperature range and peak exposure.
- Confirm any thermal cycles or spikes.
- Specify whether strength must be maintained after exposure.
When to consider SmCo
If temperature stability or corrosion resistance is critical, SmCo may be a better fit even if initial strength is lower.
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