ISO 48-4:2018
Rubber, vulcanized or thermoplastic — Determination of hardness — Part 4: Indentation hardness by durometer method (Shore hardness)
This document specifies a method for determining the indentation hardness (Shore hardness) of vulcanized or thermoplastic rubber using durometers with the following scales:
— the A scale for rubbers in the normal-hardness range;
— the D scale for rubbers in the high-hardness range;
— the AO scale for rubbers in the low-hardness range and for cellular rubbers;
— the AM scale for thin rubber test pieces in the normal-hardness range.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Choice of durometer
6 Apparatus
6.1 Durometer types A, D and AO
6.1.1 Pressure foot
6.1.2 Indentor
6.1.3 Indicating device
6.1.4 Calibrated spring
6.1.5 Automatic timing device (optional)
6.2 Durometer type AM
6.2.1 Pressure foot
6.2.2 Indentor
6.2.3 Indicating device
6.2.4 Calibrated spring
6.2.5 Automatic timing device (optional)
6.3 Stand
6.4 Durometer spring force calibration
7 Test pieces
7.1 General
7.2 Thickness
7.3 Surface
8 Conditioning and test temperature
9 Procedure
9.1 General
9.2 Test time
9.3 Measurements
10 Calibration and checking
10.1 Calibration
10.2 Checking using standard rubber blocks
11 Precision
12 Test report
Annex A (informative) Precision
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Choice of durometer
6 Apparatus
6.1 Durometer types A, D and AO
6.1.1 Pressure foot
6.1.2 Indentor
6.1.3 Indicating device
6.1.4 Calibrated spring
6.1.5 Automatic timing device (optional)
6.2 Durometer type AM
6.2.1 Pressure foot
6.2.2 Indentor
6.2.3 Indicating device
6.2.4 Calibrated spring
6.2.5 Automatic timing device (optional)
6.3 Stand
6.4 Durometer spring force calibration
7 Test pieces
7.1 General
7.2 Thickness
7.3 Surface
8 Conditioning and test temperature
9 Procedure
9.1 General
9.2 Test time
9.3 Measurements
10 Calibration and checking
10.1 Calibration
10.2 Checking using standard rubber blocks
11 Precision
12 Test report
Annex A (informative) Precision
Bibliography