... rubber and plastic products.This apparatus has three models of Type A, Type C and Type D, and each model is subdivided into ... T531-99, GB2411-80, hg/t2489-93, JJG304-2003.Attention: Type A: applicable to general rubber, synthetic rubber, vulcanized rubber, ... soft rubber, leather, wax, etc. Type C: applicable to the hardness test of rubber microporous material ...