QC/T 56-1993Performance test methods for automotive seat cushioning materials (English PDF)

1 Subject content and application scope

This standard specifies test methods for the physical and mechanical performance of molded (including cold plastic and thermoplastic) polyurethane foam plastics.

This standard applies to polyurethane foam for molded car seat cushions and backrest.

2 Normative references

GB 2918 Plastics - Standard atmospheres for conditioning and testing

GB 10802 Flexible polyurethane foam

GB 6343 Cellular plastics and rubbers - Determination of apparent density

GB 6670 Cellular plastics - Flexible polyurethane foam - Determination of resilience

GB 10807 Polymeric materials cellular flexible: Determination of hardness (indentation technique)

GB 6344 Flexible cellular polymeric materials - Determination of tensile strength and elongation at break

GB 10808 Cellular plastics: Tear resistance test for flexible materials

GB 6669 Flexible cellular polymeric materials - Determination of compression set

3 Test items

This standard specifies the methods for seven tests: determination of apparent density, determination of resilience performance, determination of compression mark performance, determination of tensile strength and elongation break, determination of tear performance, determination of compression set, test of repeated compression.

4 General conditions for test

The standard environment for test conditioning and test shall be adjusted according to the normal standard environment specified in GB 2918, i.e., temperature of 23±2°C, relative humidity of (50±5)%, and air pressure of 86-106 kPa, 16h of conditioning.