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GB/T 8811: Evolution and historical versions
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Test method for dimensional stability of rigid cellular plastics
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| GB/T 8811-1988 | English | 199 |
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Test method for dimensional stability of rigid cellular plastics
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GB/T 8811-2008: Test method for dimensional stability of rigid cellular plastics
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GB
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... 7
Foreword
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 stability
1 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.
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