The Armoloy TDC coating will achieve hardness values of up to 78Rc, with results ranging from 72 to 78Rc. Standard hard chrome typically ranges from 68 to 72Rc. The higher rate of hardness is due to the increased density of the coating and lack of a micro-cracked surface. The hardness of the coating is not as applied to the part surface. Due to its incredibly thin nature, hardness readings taken directly on part surfaces measure a combination of the coating and part surface hardness. Coating hardness must be measured on a specially prepared coupon and tested per ASTM E384.
