Testing Instruments By Standards
ISO 48 is the test standard that specifies the methods to determine the hardness of vulcanized and thermoplastic rubber. The hardness that is calculated from these methods is expressed in International Rubber hardness Degrees (IRHD). The range of hardness lies between 10IRHD to 100IRHD. The force and the indentation diameter used in this test method is greater as compared to the pocket hardness meter testing. The force and diameter are chosen according to the application.