GB/T 18942.1-2003Polymeric materials, cellular flexible -- Determination of stress-strain characteristic in compression -- Part 1: Low-density materials (English PDF)

Foreword

This Part of this Standard is equivalent to the international standard ISO 3386-1.1996

"Polymeric materials, cellular flexible -- Determination of stress-strain characteristics

in compression -- Part 1.Low-density materials".

GB/T 18942 "Polymeric materials, cellular flexible -- Determination of stress-strain

characteristic in compression" consists of the following two parts.

Part 1.Low-density materials;

Part 2.High-density materials.

This Standard was proposed by former State Administration of Petroleum and Chemical

Industry.

This Standard shall be under the jurisdiction of National Technical Committee on

Rubber and Rubber Products of Standardization Administration of China.

The drafting organizations of this Standard. Zhuzhou Rubber and Plastics Industry

Research and Design Institute of China Rubber Group.

Main drafters of this Standard. Zheng Sanyang, Tan Yunhua.

Polymeric materials, cellular flexible -- Determination of

stress-strain characteristic in compression -- Part 1.Low-

density materials

WARNING. Personnel using this standard should be familiar with formal

laboratory operating procedures. This standard does not purport to address all

safety issues that may arise from its use. It is the user's responsibility to establish

appropriate safety and health systems and ensure compliance with national

regulations.

1 Scope

This Part of the standard specifies the method for determining the compressive stress-

strain characteristics of low-density porous elastic materials with a mass fraction of less

than 250 kg/m3.It also describes the method for calculating the compressive stress value

of such materials.

Although such materials may not necessarily have the ability to withstand long-term

loads, the compressive stress-strain characteristics can be used as a measure of the

material's load-bearing performance.

The compressive stress-strain characteristics are different from the indentation hardness

characteristics (measured according to GB/T 12825), which are affected by the

thickness and tensile properties of the tested porous elastic material, the shape of the

compression plate, and the shape and size of the test piece.

Part 2 of this Standard specifies the method for determining compressive stress and

strain in high-density materials and differs from Part 1 in the following respects.

- Primarily relevant for materials with densities above 250 kg/m³.

- Compressive stress values have been eliminated.

- Cylindrical test pieces are not permitted.

2 References

The provisions contained in the following standards constitute the provisions of this

Standard through reference in this Standard. The versions shown are valid at the time

of publication of this standard. All standards are subject to revision, and parties using

this standard should investigate the possibility of using the latest versions of the

following standards.

GB/T 6342, Cellular plastics and rubbers. Determination of linear dimensions

GB/T 12825, Polymeric materials, cellular flexible -- Determination of hardness by

indentation technique

3 Definitions

This Standard uses the following definitions.

4 Instruments

20 mm to allow air to escape from under the test piece.

5 Test piece

6 Test steps

Measure the dimensions of the test piece and calculate the area of the load-bearing

surface according to the corresponding steps specified in GB/T 6342.

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