ISO 844:2021
Rigid cellular plastics — Determination of compression properties
This document specifies methods for determining the compressive strength and corresponding relative deformation, the compressive stress at 10 % relative deformation, and the compressive modulus of rigid cellular plastics.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Principle
6 Apparatus
6.1 Compression-testing machine
6.2 Devices for measuring displacement and force
6.2.1 Measurement of displacement
6.2.2 Measurement of force
6.2.3 Calibration
6.3 Instruments for measuring the dimensions of the test specimens
7 Test specimens
7.1 Dimensions
7.2 Preparation
7.3 Number
7.4 Conditioning
8 Procedure
9 Expression of results
9.1 General
9.2 Compressive strength and corresponding relative deformation
9.2.1 Compressive strength
9.2.2 Nominal relative deformation (procedure A)
9.2.3 Relative deformation (procedure B)
9.3 Compressive stress at 10 % nominal relative deformation (procedure A)
9.4 Nominal compressive modulus of elasticity (procedure A)
9.5 Compressive modulus of elasticity (procedure B)
10 Precision
10.1 Procedure A
10.2 Procedure B
11 Test report
Annex A (informative) Remarks about the determination of the compressive modulus
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Principle
6 Apparatus
6.1 Compression-testing machine
6.2 Devices for measuring displacement and force
6.2.1 Measurement of displacement
6.2.2 Measurement of force
6.2.3 Calibration
6.3 Instruments for measuring the dimensions of the test specimens
7 Test specimens
7.1 Dimensions
7.2 Preparation
7.3 Number
7.4 Conditioning
8 Procedure
9 Expression of results
9.1 General
9.2 Compressive strength and corresponding relative deformation
9.2.1 Compressive strength
9.2.2 Nominal relative deformation (procedure A)
9.2.3 Relative deformation (procedure B)
9.3 Compressive stress at 10 % nominal relative deformation (procedure A)
9.4 Nominal compressive modulus of elasticity (procedure A)
9.5 Compressive modulus of elasticity (procedure B)
10 Precision
10.1 Procedure A
10.2 Procedure B
11 Test report
Annex A (informative) Remarks about the determination of the compressive modulus
Bibliography