GB/T 42267-2022Flexible cellular polymeric materials - Determination of compression set under humid conditions (English PDF)
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Issued by
State Administration for Market Regulation, China National Standardization Administration
Level / Type
National · Recommended
Issue date
December 30, 2022
Implementation date
April 1, 2023
Scope
GB/T 42267-2022 (Flexible cellular polymeric materials - Determination of compression set under humid conditions) is available as an English-translated PDF.
GB/T 42267-2022 — This document describes a method for the determination of compression set of flexible porous polymeric materials under wet conditions.
In this method, the sample is placed under the conditions of specified time, temperature, humidity and constant compression deformation, and the thickness of the sample after the specified recovery time is measured. degree of change.
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Document preview — GB/T 42267-2022
National Standard of the People's Republic of China
- ICS
- 83.140.99
- Classification
- G 47
Issued by: State Administration for Market Regulation, China National Standardization Administration
Contents
- foreword
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 principles
- 5 instruments
- 5.1 Stainless steel compression device
- 5.2 Micrometer
foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents"
drafting.
This document is equivalent to ISO 13362.2000 "Determination of compression set of flexible porous polymeric materials under wet conditions".
Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents.
1 Scope
This document describes a method for the determination of compression set of flexible porous polymeric materials under wet conditions.
In this method, the sample is placed under the conditions of specified time, temperature, humidity and constant compression deformation, and the thickness of the sample after the specified recovery time is measured.
degree of change.
2 Normative references
The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references
For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
this document.
GB/T 6342-1996 Determination of linear dimensions of foamed plastics and rubber (ISO 1923.1981, IDT)
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
compression set
The difference between the initial thickness of a porous material sample and the final thickness after being compressed at a specified temperature and time and recovered after a specified time and the initial thickness
ratio of thickness.
4 principles
Keep the sample under the specified temperature, relative humidity and constant deformation conditions for a specified time, and measure the thickness change of the sample after recovery.
5 instruments
5.1 Stainless steel compression device
It consists of two flat plates whose planar size is larger than that of the sample, a positioning piece and a fixture. The two plates are kept parallel during the test, and the distance between the two plates
The distance is adjusted according to the specimen compression requirements.
5.2 Micrometer
It should meet the provisions of 3.1 in GB/T 6342-1996.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 11 pages — is available in the English PDF.
Referenced standards
Normative references
ISO 1923.1981
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Related Standards
GB/T 6342-1996 — Cellular plastics and rubbers - Determination of linear dimensions
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