International Standards Normal IRHD Hardness:
ASTM D 1415 - DIN ISO 48-2 - ISO 48-1 - ISO 48-2 - JIS K 6253-1 - JIS K 6253-2 - VDA 675 101 - a.o.
For the measurement of the normal IRHD hardness N, 5 modular digital measuring systems for fully automatic hardness testing are available in our laboratory. The method is suitable for measuring elastomers and thermoplastic elastomers in the normal hardness range from 35 IRHD to 85 IRHD.
The IRHD (International Rubber Hardness Degree) hardness test is a test method for determining the ball indentation hardness of elastomers and thermoplastic elastomers. A ball is pressed onto the specimen surface with a defined force. The penetration depth of the ball is measured, and the degree of hardness is calculated accordingly. The IRHD hardness test is divided into different methods, each of which differs in the diameter of the penetrating ball and the penetration force.
Measured values determined with Method N (normal test) show a good comparability to the measured values determined with the durometer method Shore A.