GB/T 8811-2008 English PDF

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GB/T 8811-2008: Test method for dimensional stability of rigid cellular plastics
Status: Valid

GB/T 8811: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 8811-2008	114	Add to Cart	3 days	Test method for dimensional stability of rigid cellular plastics	Valid
GB/T 8811-1988	199	Add to Cart	3 days	Test method for dimensional stability of rigid cellular plastics	Obsolete

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Basic data

Standard ID: GB/T 8811-2008 (GB/T8811-2008)
Description (Translated English): Test method for dimensional stability of rigid cellular plastics
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G31
Classification of International Standard: 83.100
Word Count Estimation: 6,671
Date of Issue: 2008-01-04
Date of Implementation: 2008-09-01
Older Standard (superseded by this standard): GB/T 8811-1988
Quoted Standard: GB/T 2918-1998; GB/T 6342-1996
Adopted Standard: ISO 2796-1986, IDT
Regulation (derived from): China National Standard Approval Announcement2008 No.1 (Total No.114)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the method for determining rigid foam dimensional stability under specified temperature and relative humidity conditions. This standard applies to the determination of rigid foam dimensional stability.

GB/T 8811-2008: Test method for dimensional stability of rigid cellular plastics

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Test method for dimensional stability of rigid cellular plastics ICS 83.100 G31 National Standards of People's Republic of China GB/T 8811-2008/ISO 2796. 1986 Replacing GB/T 8811-1988 Rigid foam dimensional stability test methods (ISO 2796. 1986, IDT) Posted 2008-01-04 2008-09-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard is identical with ISO 2796. 1986 "rigid foam dimensional stability test methods." The standard ISO 2796. 1986 only made the following editorial changes. --- Sequentially 7.3 Test Procedure some provisions have been adjusted; --- Remove the ISO 2796. 1986 in the statement of the precision and accuracy. This standard is GB/T 8811-1988 "rigid foam dimensional stability test methods" amendments. This standard and GB/T 8811-1988 The main differences are as follows. --- Increasing the foreword; --- Increasing the terms and definitions; --- Provisions given the sample size is the smallest; --- After the samples were removed from the selected test conditions, storage time is changed from 1h 1h ~ 3h; --- Test report adds, "size change rate arithmetic mean" information. Since the implementation of this standard, instead of the GB/T 8811-1988. The standard proposed by China National Light Industry Council. This standard by the National Standardization Technical Committee of plastic products. This standard was drafted. Beijing Plastics Research Institute, Beijing Technology and Business University. The main drafters of this standard. Zhuwu Lan, Chen Qian. This standard replaces the standards previously issued as follows. --- GB/T 8811-1988. GB/T 8811-2008/ISO 2796. 1986 Rigid foam dimensional stability test methods

1 Scope

This standard specifies the method for determining the rigid foam dimensional stability under specified temperature and relative humidity conditions. This standard applies to the determination of rigid foam dimensional stability.

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 foam rubber - Determination of linear dimensions (idt ISO 1923. 1981)

3 Terms and Definitions

The following terms and definitions apply to this standard. 3.1 Sample placed at a certain time at a particular temperature and relative humidity conditions, resulting in three-dimensional directions perpendicular to each other on an irreversible dimension Variety. Principle 4 The sample is placed in a certain period of time under specified test conditions, and state regulation in a standard environment, the linear dimensions measured hair Health changes.

5 Instruments

5.1 thermostat or humidity chamber Can satisfy any constant temperature and humidity chamber or 7.1 test conditions required. Measuring 5.2 Measuring linear dimensions measuring sample shall comply with GB/T 6342-1996 of.

6 Sample and preparation

6.1 Preparation of the sample By sawing or other machining methods specimen was cut from the sample, and the sample surface to ensure smooth without cracks, without special rules shall Remove the foam skin. 6.2 Sample size Rectangular parallelepiped sample, the sample size is the smallest (100 ± 1) mm × (100 ± 1) mm × (25 ± 0.5) mm. 6.3 Number of specimens Any one of the selected test conditions, each sample was tested at least three specimens. 6.4 conditioning Samples shall GB/T 2918-1998 requirements, at a temperature of (23 ± 2) ℃, the state relative humidity of 45% to 55% under the conditions GB/T 8811-2008/ISO 2796. 1986 ......

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