Original standard number GB 7539-87 HG/T 2867-1997 Standard environment for the conditioning and testing of rubber or plastic coated fabrics HG/T2867-1997 Standard download decompression password: www.bzxz.net

HG/T2867-1997
This standard is equivalent to the international standard ISO2231:1989 (1994) G13753987 is equivalent to the international standard ISO2231:1973. Two standard environments are specified for the test, namely environment A and environment B; two methods are also specified for adjustment, namely method A and method B. In 1992, China's standards were rectified and made mandatory industry standards. The international standard has been revised, the second edition was released in 1989, and confirmed in 1994. The international standard specifies five standard test environments, namely environment A, B, C, D, and E, and two methods are specified for adjustment, namely method 1 and method 2. my country has a vast population, located in temperate, subtropical, and tropical zones. The new version of the international standard is equivalent to the new version of the international standard, and there are multiple standard environments to choose from after the release. Appendix A of this standard is the appendix of the standard.
From the date of implementation of this standard, the original national standard GB7539-87 Standard environment for parking and testing of rubber coated fabrics is abolished: This standard is issued by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Rubber and Rubber Products Standardization Technical Committee for Coated Fabrics and Products. The drafting unit of this standard is: Shenyang Rubber Industry Products Research Institute of the Ministry of Chemical Industry. The main drafter of this standard is Zhang Jingzhi.
HG/T2867-1997
ISO Foreword
ISO (International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of formulating international standards is usually carried out by ISO technical committees. Any member body interested in the project for which a technical committee has been established has the right to participate in the committee. All governmental and non-governmental international organizations that have relations with ISO may also participate in this work. In all aspects of electrotechnical standardization, TSO cooperates closely with the International Electrotechnical Technical Committee (IEC). Draft international standards adopted by the technical committees are sent to the member groups for voting before they are approved as international standards by the ISO Council. According to the ISO(I) procedure, at least 75 of the voting member groups must vote in favor before they can be published as international standards. International Standard ISO 2231 was prepared by ISO/TC45 Technical Committee Rubber and Rubber Products. This second edition abolishes and replaces the first edition (ISO 2231: 1973). The original Chapters 3 and 4 have been technically revised (see Chapters 5 and 6 of the revised version). In addition, a regulation chapter has been added (see Chapter 1 of the revised version). 149
HG/T 2867—1997
Most coated fabrics contain a certain amount of moisture, which is absorbed from the air with which the fabric is exposed. The moisture content depends on the maximum amount of water vapor in the air.
Some properties, especially quality and those related to the tearing of fabric yarns, are affected by moisture content. Therefore, in order to standardize the test method, it is necessary to control the moisture content of the test material. This requirement can be achieved by placing the sample in a humidity-controlled environment before the test. For some other properties, the amount of moisture in the fabric has little effect on it, so only the temperature needs to be controlled. 150
1 Scope
Chemical Industry Standard of the People's Republic of China
Rubber-or plastics-coated fabrics
Standard atmospheres for conditioning and testing
Rubber-or plastics-coated fabrics-standardatmospheres for conditioning and tesling This standard specifies the conditioning requirements and conditioning methods for rubber or plastics-coated fabrics. 2 Referenced standards
HG/T 2867—1997
IDT is0 2231: 1989(1994)
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. The versions shown are valid when this standard is published. All standards are subject to revision and parties using this standard should investigate the possibility of using the latest versions of the following standards. IS0554:1976 Standard atmospheres for conditioning and/or testing --- Specifications (see Annex A). 3 Definitions
This standard adopts the following definitions.
3.1 Reference atmosphere rcfcrcncetmosphere is a theoretical atmosphere. If the relevant conversion factors are known, the characteristic values ​​measured under different ambient conditions can be related to this theoretical atmosphere.
Note: Standard reference atmospheres are defined in IS0551: 3.2 Standard atmosphere for conditioning and for testing The actual environment in which the test is carried out.
3.3 Method of conditioning The characteristics of the environment in which the coated fabric is tested and the time of exposure to the environment. 3.4 Standard condition The condition in which the coated fabric reaches equilibrium in the standard atmosphere for conditioning and testing. 3.5 Moisture equilibrium Moisture equilibrium The equilibrium in which the coated fabric reaches no significant change in mass after exposure to flowing air. 4 Preconditioning
When the fabric base is a highly hygroscopic material or the test method requires high precision, the sample should be placed in an environment with a relative humidity of no more than 10% and a temperature of 60℃~70℃ for preconditioning to allow the sample to reach equilibrium (see 3.5). Note: When the relative humidity is 65% and the temperature is 20℃, the relative humidity is about 5% when heated to 60~70℃ under constant bed force. Higher temperatures will cause changes in some coating layers.
Approved by the Ministry of Chemical Industry of the People's Republic of China on April 21, 1997 and implemented on October 1, 1997
5 Characteristics of the test environment
HG/T 2867—1997
According to the standards or specifications specified for each test or material, one of the following harmonic environments shall be selected. The selection of these environments is related to the adoption practices and different applications in my country and shall be stated in the test report. 5.1 Environment A
Temperature is 20°C+2°C;
Relative humidity is 65%-5%.
5.2 Environment B
Temperature is 23°C±2°C;
Relative humidity is 50%±5%.
5.3 Environment C (tropical area)
Temperature is 27°C±2°C;
Relative humidity is 65±5%.
5.4 Environment D (instrument controlled temperature)
Temperature is 23°C±2°C.
5.5 Environment E (only tropical temperature control)
Temperature is 27℃12
6 Adjustment method
According to the standard or specification specified in the test item or material, select one of the following adjustment methods. 6-1 Adjustment method 1
The sample should be exposed to standard environment A, B or (medium) until it reaches equilibrium. If the difference in the mass of the sample exposed to flowing air (each time interval is 2 hours) is less than 0.1%, it is considered to have reached the equilibrium state under this standard environment. For single-sided coated fabrics, it is recommended to expose for at least 16 hours. For double-sided coated fabrics, it is recommended to expose for at least 24 hours. 6.2 Conditioning method 2
The specimen shall be freely exposed to standard environment D or E. The exposure time is 3h. 152
AO Introduction
IIG/T28671997
Appendix A
(Appendix of the standard)
Standard environment for adjustment and/or testing - It is ideal to stipulate a single standard environment for adjustment and/or testing. However, due to the variety of climates and the difficulty in converting the test results obtained under different test and/or adjustment environment conditions into the values ​​of the single standard environment, it is not recommended to stipulate a single standard environment. Standard environments are not possible.
However, when implementing this International Standard, it is best to select an environment for each test item from the environments specified in the document. A1
Scope
This International Standard specifies standard environments for adjustment and/or testing that do not differ greatly from normal environmental conditions. A2 Specifications
A2.1 Standard environments for adjustment and/or testing
Expression method
Standard tolerance (wide tolerance)
Small tolerance (narrow tolerance)
Temperature/°C
# In this way,The tolerance range of relative humidity is standard tolerance: 15%~~55% and 0%~70%; - small tolerance: 48%~-52% and 63%~-67%. Relative humidity/%
Temperature/C
Pressure/kPawww.bzxz.net
Between 86 and 106
Recommended
Applicable to tropical countries
Used in certain specific occasions
Relative humidity/%
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