... measure vulcanized rubber and plastic products.This apparatus has three models of Type A, Type C and Type D, and ... 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.Type D: applicable to hard rubber, hard resin, acrylic, glass, cushiony ...