Request a QuoteA higher grade number is not automatically a better design. The correct magnet balances flux target, operating point, temperature, irreversible loss, coating and assembly conditions.
Review material family, temperature and demagnetization margin together. Use the published data as a selection reference and confirm the requirement for the actual geometry.
Define continuous and peak temperature at the magnet, not only ambient temperature. Include reverse fields, air gap, nearby steel, mechanical shock and any thermal cycle that can move the operating point toward the knee of the demagnetization curve.
Final grade selection requires a magnetic-circuit review, but the material family narrows the route.
| Material | Strength | Temperature / environment position |
|---|---|---|
| NdFeB | Highest energy density | Grade-dependent temperature; coating usually required |
| SmCo | High energy density | Strong high-temperature and corrosion performance |
| Ferrite | Moderate | Stable, economical and naturally corrosion resistant |
| AlNiCo | Moderate remanence | Excellent temperature stability but lower coercivity |
Ningbo Empire can review the B-H curve, load line, tolerance stack and magnetization fixture requirements. Prototype validation should measure the assembly output at temperature rather than relying only on room-temperature magnet data.
Magnet temperature and reverse field
Magnetic circuit, material and grade
Assembly output at temperature
This sequence is a review aid, not a measured result or product approval.
No. N52 offers higher room-temperature energy density, while another grade may provide better coercivity, temperature margin, availability or cost for the application.
SmCo is often considered for high temperature, corrosive environments or applications needing strong magnetic stability, subject to geometry and cost review.
Review the relevant product and manufacturing capability.
View capabilityCompare the adjacent material or application route.
Learn moreCompare nickel, zinc, epoxy, phosphate, parylene and other coatings for NdFeB magnets by corrosion protection, dimensions, adhesion and assembly use.
Read the guideCompare the available permanent magnet families before selecting a grade.
Compare materialsSend the drawing, application conditions and annual volume. Engineering will review the material, process and inspection route.