EFFECTS OF SOME INFLUENCE PARAMETERS ON THE CALIBRATION METHOD FOR IRHD ELASTOMER HARDNESS TESTERS

K. Herrmann, A.Stibler, P. Strobel

Abstract

The method for hardness measurement expressed in International Rubber Hardness Degree - IRHD - of rubber and plastics is described in the standard ISO 48. Rising requirements to the accuracy of hardness measurements have led to the result that verification/calibration methods for the testers acknowledged by a standard are needed. Results of these investigations will be used as a basis for the establishment of the relevant international standard which is in preparation. Some experiments for IRHD measurement by "Low-hardness test" - method L and "Microtest" - method M are presented in this paper. Practical measurements with different indenters and variation of other measurement conditions were carried out. For the obtained results regression evaluations were applied to determine the sensitivity coefficients for the influence quantities. Finally, the effects of all influence quantities on the uncertainty of hardness testers and on the calibration uncertainty were calculated and summarized.

Keywords

Hardness, rubber, IRHD, uncertainty

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IMEKO-WC-2000-TC5-P168.pdf

DOI

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IMEKO TC

TC5 - Hardness Measurement

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