Rubber, vulcanized or thermoplastic — Determination of hardness — Part 6: Apparent hardness of rubber-covered rollers by IRHD method (ISO 48-6:2018)
This document specifies a method for the determination of the apparent hardness, expressed inInternational Rubber Hardness Degrees (IRHD), of vulcanized- or thermoplastic-rubber roller covers.The method is similar in principle to the methods used for the determination of the hardness of rubberin ISO 48-2 in that it consists essentially of measuring the depth of penetration of a spherical indentoroperating under a specified force. The apparatus used is similar to that described in ISO 48-2, having abase specifically designed for application to roller covers and similar curved surfaces.NOTE With some rollers, there can be significant variation in the thickness of the rubber over the surface ofthe roller, which could affect the measured apparent hardness.
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