... , EH, and AH grades. When you purchased magnets form Ketian magnet you get the following superb benefits: Improved Corrosion Resistance: The ... can qualitatively reflect the service life of the magnet. This test exposes the magnet to 130°C, 95% RH, at 2 ATM ... working temperatures up to 240°C. Excellent Corrosion Resistance:Ketian magnet offers a number of coatings including: Nickel, Epoxy, Zinc, Tin ...