GB/T 26392-2011Slow recovery foam - Determination of recovery time (English PDF)
慢回弹泡沫 复原时间的测定
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
May 12, 2011
Implementation date
September 15, 2011
Scope
GB/T 26392-2011 is the English-translated version of 慢回弹泡沫 复原时间的测定.
GB/T 26392-2011 is the Chinese standard "Slow recovery foam - Determination of recovery time". Its scope clause reads: This standard specifies the method for determination of the recovery time after the slow rebound foam under pressure.
This standard applies to the determination of the slow rebound foam recovery time. Its clauses include test instruments; sample; for conditioning and testing environment; test procedure.
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Document preview — GB/T 26392-2011
National Standard of the People's Republic of China
- ICS
- 83.140.10
- Classification
- G 32
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 4 Test Instruments
- 5 Sample
- 6 for conditioning and testing environment
- 7 Test procedure
1 Scope
This standard specifies the method for determination of the recovery time after the slow rebound foam under pressure.
This standard applies to the determination of the slow rebound foam recovery time.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research
Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 2918-1998 standard plastic sample conditioning and environmental tests (idt ISO 291.1997)
GB/T 6342-1996 plastics and rubbers - Determination of linear dimensions (idt ISO 1923. 1981)
Principle 3
Slow rebound foam is applied to the sample indentation force, to produce a predetermined deformation, after holding a predetermined time, the measurement sample required basic rehabilitation time.
4 Test Instruments
Instrument uses a 203mm diameter circular flat indenter, through flexible swivel joint is connected with the load measuring device, thereby
The instrument can be (1000 ± 100) mm/min sample rate of indentation, thus producing deformation. The instrument has a horizontal supporting plate for supporting the
Sample support plate opening has a diameter of about 6.5mm, hole spacing of 20mm, so that the air can be discharged from below the sample during the test.
5 Sample
5.1 Sample Requirements
Specimens should be able to meet part of the requirements of the test sample.
Arbitration test, at least the production of foam samples 7d or more.
5.2 Sample Size
Unless otherwise specified, the sample size should not be less than 380mm × 380mm × 100mm, the thickness of the sample is not equal to 100mm, and should try
Indicate the thickness of the sample inspection report.
Sample size according to the provisions of GB/T 6342-1996 measure, parallelism tolerance parallel to the plane should not exceed 1%.
5.3 Number of specimens
A test specimen, or by the supply and demand sides agreed to determine the number of samples.
6 for conditioning and testing environment
According to the provisions of GB/T 2918-1998, the specimen before the test should be at a temperature of (23 ± 2) °C, relative humidity (50 ± 10)% into the environment
Line conditioning, settling time less than 16h. In the same conditioning test environment.
7 Test procedure
The sample is placed on the support plate, so that the pressure head drop, contacts the sample, the sample is applied to pre-load 4.5N to the point of origin determination test
The initial thickness of the sample.
GB/T 25254-2022 | GB/T 32363.2-2015 | GB/T 31062-2014 | GB/T 24150-2026 | GB/T 20219.1-2026 | GB/T 10004-2026 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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