GB/T 8811-2008 PDF English
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GB/T 8811: Historical versions
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| GB/T 8811-1988 | 199 | Add to Cart | 3 days | Test method for dimensional stability of rigid cellular plastics | Obsolete |
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GB/T 8811-2008: Test method for dimensional stability of rigid cellular plastics
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT8811-2008GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 83.100 G 31 GB/T 8811-2008 / ISO 2796.1986 Replacing GB/T 8811-1988 Rigid cellular plastics - Test method for dimensional stability (ISO 2796.1986, IDT) Issued on: JANUARY 04, 2008 Implemented on: SEPTEMBER 01, 2008 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of PRC; National Standardization Administration.
Table of Contents
Foreword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 4 4 Principle... 4 5 Instruments... 5 6 Specimens and preparation... 5 7 Test methods... 5 8 Results representation... 7 9 Test report... 7Foreword
This standard identically adopts ISO 2796.1986 "Cellular plastics, rigid - Test for dimensional stability". This standard makes only the following editorial modifications to ISO 2796.1986. - ADJUST the order of some clauses in Article 7.3 "Test procedures"; - DELETE the statements regarding precision and accuracy in ISO 2796.1986. This standard is a revision of GB/T 8811-1988 "Rigid cellular plastics - Test method for dimensional stability". The main differences between this standard and GB/T 8811-1988 are as follows. - ADD the foreword; - ADD the terms and definitions; - SPECIFY that the given specimen size is the minimum size; - CHANGE the placement time of the specimen after removal from the selected test conditions from 1 hour to 1 ~ 3 hours; - ADD the information on the "Arithmetic mean of the rate of dimensional change" to the test report. This standard replaces GB/T 8811-1988, from the date of its implementation. This standard was proposed by the China National Light Industry Council. This standard shall be under the jurisdiction of the National Technical Committee on Standardization of Plastics Products. The drafting organizations of this standard. Beijing Plastics Research Institute, Beijing Technology and Business University. The main drafters of this standard. Zhu Wulan, Chen Qian. This standard replaces the standard previously issued as follows. - GB/T 8811-1988. Rigid cellular plastics - Test method for dimensional stability1 Scope
This standard specifies a method for determining the dimensional stability of rigid cellular plastics under specific temperature and relative humidity conditions. This standard is applicable to the determination of the dimensional stability of rigid cellular plastics.2 Normative references
The provisions in following documents become the provisions of this Standard through reference in this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 2918-1998 Plastics - Standard atmospheres for conditioning and testing (idt ISO 291.1997) GB/T 6342-1996 Cellular plastics and rubbers - Determination of linear dimensions (idt ISO 1923.1981)3 Terms and definitions
The following terms and definitions apply to this standard. 3.1 Dimensional stability The irreversible dimensional change in three mutually perpendicular directions that occurs after a specimen has been placed under specific temperature and relative humidity conditions for a certain period of time.4 Principle
The change in linear dimensions of a specimen is measured, after it has been placed under specified test conditions for a certain period of time and conditioned under a standard environment.5 Instruments
5.1 Constant temperature or humidity chamber Any constant temperature or humidity chamber capable of meeting the test conditions required in 7.1. 5.2 Measuring instruments Measuring instruments for measuring the linear dimensions of the specimen shall conform to the requirements of GB/T 6342-1996.6 Specimens and preparation
6.1 Specimen preparation Specimens shall be cut from the sample by sawing or other mechanical processing methods, ensuring the specimen surface is flat and free of cracks. Unless otherwise specified, the outer layer of the cellular plastic shall be removed. 6.2 Specimen dimensions The specimen shall be a cuboid, which has a minimum dimension of (100 ± 1) mm × (100 ± 1) mm × (25 ± 0.5) mm. 6.3 Number of specimens For any selected test conditions, at least three specimens shall be tested for each sample. 6.4 Conditioning The specimens shall be conditioned according to GB/T 2918-1998, at a temperature of (23 ± 2) °C and a relative humidity of 45% ~ 55%.7 Test methods
7.1 Test conditions 7.1.1 Select test conditions from the following. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
