This standard specifies three methods for determining the compression set of flexible cellular polymeric materials.
This standard applies only to latex and polyurethane foams of thickness greater than 2mm.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 6342-1996 Cellular plastics and rubbers - Determination of linear dimensions (idt ISO 1923: 1981)
3 Term and definition
For the purpose of this standard, the following term and definition apply.
3.1
compression set
the difference between the initial thickness and the final thickness of a test piece of the flexible cellular polymeric material after compression for a given time at a given temperature and after a given recovery time, the difference being referred to the initial thickness
4 Principle
Foreword i 1 Scope 2 Normative references 3 Term and definition 4 Principle 5 Apparatus 6 Test pieces 7 Test procedure 8 Calculation and expression of results 9 Test report
1 Scope
This standard specifies three methods for determining the compression set of flexible cellular polymeric materials.
This standard applies only to latex and polyurethane foams of thickness greater than 2mm.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 6342-1996 Cellular plastics and rubbers - Determination of linear dimensions (idt ISO 1923: 1981)
3 Term and definition
For the purpose of this standard, the following term and definition apply.
3.1
compression set
the difference between the initial thickness and the final thickness of a test piece of the flexible cellular polymeric material after compression for a given time at a given temperature and after a given recovery time, the difference being referred to the initial thickness
4 Principle
Contents of GB/T 6669-2008
Foreword i
1 Scope
2 Normative references
3 Term and definition
4 Principle
5 Apparatus
6 Test pieces
7 Test procedure
8 Calculation and expression of results
9 Test report
