ISO 48-6:2018
Rubber, vulcanized or thermoplastic — Determination of hardness — Part 6: Apparent hardness of rubber-covered rollers by IRHD method
This document specifies a method for the determination of the apparent hardness, expressed in International 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 rubber in ISO 48-2 in that it consists essentially of measuring the depth of penetration of a spherical indentor operating under a specified force. The apparatus used is similar to that described in ISO 48-2, having a base 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 of the roller, which could affect the measured apparent hardness.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Time interval between forming and finished grinding, and testing
5 Conditioning and temperature of test
6 Apparatus
6.1 Rollers having a radius greater than 50 mm
6.2 Rollers having a radius of 4 mm to 50 mm
6.3 Small rollers having a radius less than 4 mm
7 Procedure
8 Expression of results
9 Test report
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Time interval between forming and finished grinding, and testing
5 Conditioning and temperature of test
6 Apparatus
6.1 Rollers having a radius greater than 50 mm
6.2 Rollers having a radius of 4 mm to 50 mm
6.3 Small rollers having a radius less than 4 mm
7 Procedure
8 Expression of results
9 Test report
Bibliography