Br = remanence — flux density with no applied field. Hci = intrinsic coercivity — resistance to demagnetization. BHmax = energy product — overall magnetic strength figure of merit. Higher temperature suffix (H → SH → UH → EH) trades slightly lower Br for much higher coercivity, essential in motors and elevated-temperature assemblies.

Salt spray hours per ASTM B117 at 35°C. Coating thickness adds 5–25 µm per side — account for this in tight-tolerance assemblies. Gold and black nickel are cosmetic variants of the Ni-Cu-Ni system. Parylene is applied via CVD and is not available for all geometries.

Reversible losses recover fully when the magnet cools back to room temperature. Irreversible losses occur when the operating point crosses the knee of the demagnetization curve — permanent partial flux loss. The threshold depends on grade and geometry (permeance coefficient Pc). Contact Radial Magnets for a full operating point analysis.