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GB/T 12000-2017

Chinese Standard: 'GB/T 12000-2017'
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Standard ID GB/T 12000-2017 (GB/T12000-2017)
Description (Translated English) Plastics--Determination of the effects of exposure to damp heat, water spray and salt mist
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G31
Classification of International Standard 83.080.01
Word Count Estimation 14,196
Date of Issue 2017-12-29
Date of Implementation 2018-07-01
Drafting Organization Guangzhou Research Institute of Synthetic Materials Co., Ltd., Mid-Blue Chenguang Chemical Research and Design Institute Co., Ltd., Guangzhou Special Pressure Equipment Testing Institute, Beijing Tian-gang auxiliaries limited liability company, Beijing Huacu Chenguang Technology Co., Ltd., with the Chengdu Science and Technology Co., Ltd.
Administrative Organization National Technical Committee of Plastics Standardization Technical Committee aging method (SAC/TC 15/SC 5)
Proposing organization China Petroleum and Chemical Industry Federation
Issuing agency(ies) People's Republic of China General Administration of Quality Supervision, Inspection and Quarantine, China National Standardization Administration

GB/T 12000-2017
ICS 83.080.01
G 31
GB/T 12000-2017/ISO 4611.2010
Replacing GB/T 12000-2003
Plastics – Determination of the Effects of
Exposures to Dame Heat, Water Spray and Salt Mist
(ISO 4611.2010, IDT)
塑料 暴露于湿热, 水喷雾和盐雾中影响的测定
Issued by. General Administration of Quality Supervision, Inspection and
Standardization Administration of PRC.
Table of Contents
Foreword ... 4
Introduction ... 6
1 Scope ... 8
2 Normative References ... 8
3 Principle ... 8
4 General Test Conditions ... 9
4.1 Equipment requirements ... 9
4.2 Exposure conditions ... 10
4.3 Test specimens (see 5.2, 6.2 and 7.2) ... 13
5 Change of Mass ... 14
5.1 General ... 14
5.2 Test specimens ... 14
5.3 Conditioning ... 16
5.4 Procedure ... 16
5.5 Expression of results ... 16
6 Change of Dimensions and Appearance ... 17
6.1 General ... 17
6.2 Test specimens ... 17
6.3 Conditioning ... 17
6.4 Procedure ... 17
6.5 Expression of results ... 18
7 Change of Other Physical Properties ... 19
7.1 General ... 19
7.2 Test specimens ... 19
7.3 Conditioning ... 19
7.4 Procedure ... 19
7.5 Expression of results ... 20
8 Test Report ... 20
Annex A (informative) Absorption of moisture by a test specimen of a plastics
material in equilibrium with its conditioning atmosphere ... 22
Bibliography ... 23
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 12000-2003 Determination of the Effects of Exposure to
Damp Heat, Water Spray and Salty Mist for Plastics; compared with GB/T 12000-2003,
this Standard has the major technical changes as follows.
--- Modify the referenced documents in the Clause 2 “Normative References” (see
Clause 2 of this Edition; Clause 2 of Edition 2003);
--- Modify relevant contents in Clause 4 “Test Environment and Equipment”; change
the clause name into “General Test Conditions” (see Clause 4 of this Edition;
Clause 4 of Edition 2003);
--- Add detailed description of the requirements for the test equipment (see 4.1 of
this Edition);
--- Modify the contents of damp heat test conditions (see 4.2.1 of this Edition; 4.1.1
of Edition 2003);
--- Modify the contents of salt mist test conditions (see 4.2.3 of this Edition; 4.1.3 of
Edition 2003);
--- Modify the relevant contents of “status adjustment”; change the status
adjustment time into “at least 86h”; delete the requirements for air pressure
condition (see 4.3.1 of this Edition; 4.4 of Edition 2003).
This Standard adopts translation method to equivalently use ISO 4611.2010 Plastics
– Determination of the Effects of Exposure to Damp Heat, Water Spray and Salt Mist.
The documents of our country that have a consistent correspondence with the
international documents referenced in this Standard are as follows.
--- GB/T 1034-2008 Plastics – Determination of Water Absorption (ISO 62.2008,
This Standard was proposed by China Petroleum and Chemical Industry Federation.
This Standard shall be under the jurisdiction of Subcommittee on Aging Methods of
National Technical Committee on Plastics of Standardization Administration of China
(SAC/TC 15/SC 5).
Drafting organizations of this Standard. Guangzhou Synthetic Material Institute Co.,
Ltd.; China Bluestar Chengrand Chemical Co., Ltd.; Guangzhou Special Pressure
Equipment Inspection and Research Institute; Beijing Tiangang Auxiliary Co., Ltd.;
0.1 Various test methods are available for the exposure of plastics to different
aggressive agents acting in a combined and simultaneous fashion, such as natural
weathering. Other test methods are available for the purpose of a separate evaluation
of the action of individual aggressive agents. Among the latter there are, for example,
tests for the resistance to specific chemicals and to radiations of a definite spectral
For some applications, it may be desirable to evaluate the behavior of the materials in
a hot damp atmosphere just below the saturation limit of water vapor, as well as in the
presence of the liquid phase.
In these conditions not only water absorption or leaching of some ingredients of the
composition may be observed but also degradation phenomena due to hydrolysis,
exudation of plasticizers, etc.
It may also be desirable sometimes to evaluate the behavior of materials in the
presence of a highly corrosive electrolyte, such as a sodium chloride solution (salt mist),
which is the principal aggressive agent present in marine environments and of
particular importance in the case of nautical applications. It is well known that sodium
chloride has no noticeable action on the polymers that are the basic components of
plastics, and that salt solutions, owing to their higher osmotic pressure, are normally
absorbed by plastics to a lesser degree than pure water, but it cannot be assumed a
priori that they have no action on composite materials, containing fillers, reinforcing
components or pigments, for instance.
Furthermore, the evaluation of the effect of salt mist can be very important for finished
or semi-finished articles which, while basically consisting of plastic materials, do
contain some metallic elements, such as molded-in inserts, thin laminated foils, surface
coatings applied by electro-plating or other procedures, or, lastly, metal cores sheathed
with plastics by extrusion or by dipping in pastes or fluidized-bed powders.
0.2 Methods and equipment for obtaining reproducible aggressive environments of the
above types are well known and have been described by International Standards
relevant to other materials and IEC standards relevant to electrical and electronic
components. The same equipment and procedures described in these standards can
also be employed for plastics, with appropriate care and adjustments.
0.3 The present Standard is intended to provide general guidance only, on the choice
of suitable equipment and procedures for obtaining the exposure conditions described
above and for the preparation of test specimens. It also only gives general guidance
on the properties to be evaluated. Specific details are given in the various ISO and IEC
Plastics – Determination of the Effects of
Exposures to Dame Heat, Water Spray and Salt Mist
1 Scope
1.1 This Standard specifies the conditions of exposure of plastics to damp heat, water
spray, salt mist, and the methods for the evaluation of the change in some significant
characteristics after given exposure stages.
1.2 This Standard is, in general, suitable for all plastics in the form of standard test
specimens, and finished articles or parts thereof.
1.3 This Standard considers separately methods for the determination of.
⎯ change in mass,
⎯ change in dimensions and appearance,
⎯ change in physical properties.
2 Normative ......
Related standard:   GB/T 12009.2-2016  GB/T 12009.4-2016
Related PDF sample:   GB/T 37638-2019  GB/T 38287-2019
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