GB/T 18426-2021 English PDF (GBT18426-2021)

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GB/T 18426-2021: Rubber-or plastics-coated fabrics -- Low-temperature bend test
GB/T 18426-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.40
CCS G 42
GB/T 18426-2021 / ISO 4675:2017
Replacing GB/T 18426-2001
Rubber- or plastics-coated fabrics - Low-temperature bend
test
(ISO 4675:2017, IDT)
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: MAY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Principle ... 6 
5 Apparatus ... 6 
6 Test pieces ... 8 
7 Time-interval between manufacture and testing ... 8 
8 Conditioning of test pieces... 8 
9 Procedure ... 8 
10 Assessment of damage ... 9 
11 Test report ... 10 
Foreword
This document is drafted in accordance with GB/T 1.1-2020 "Directives for
standardization - Part 1: Rules for the structure and drafting of standardizing
documents".
This document replaces GB/T 18426-2001 "Rubber or plastics-coated fabrics - Low-
temperature bend test". Compared with GB/T 18426-2001, the main technical changes
are as follows:
- Change normative references (see Clause 2; Clause 2 of the 2001 edition);
- Add Clause "Terms and definitions" (see Clause 3);
- Change Figure 1, Figure 2 and the marking method; correct the dimension of part
H of the test device bending jig in Figure 2 (see Clause 5; Clause 4 of the 2001
edition);
- Change the magnification for examining the cracks on the coated surface (see 9.4;
8.4 of the 2001 edition);
- Change the determination of crack length (see 10.3; 9.3 of the 2001 edition).
This document, using translation method, is identical to ISO 4675:2017 "Rubber- or
plastics-coated fabrics - Low-temperature bend test".
China’s documents which have a consistent correspondence with the international
documents normatively referenced in this document are as follows:
- GB/T 24133-2009 Rubber-or plastics-coated fabrics - Standard atmospheres for
conditioning and testing (ISO 2231:1989, IDT);
- HG/T 3050.3-2020 Rubber or plastic coated fabrics - Determination of roll
characteristics - Part 3: Method for determining thickness (ISO 2286-3:2016, IDT).
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority of this document shall not be held
responsible for identifying any or all such patent rights.
This document was proposed by China Petroleum and Chemical Industry Federation.
This document shall be under the jurisdiction of Subcommittee 10 on Coated Products,
National Technical Committee 35 on Rubber and Rubber Products of Standardization
Administration of China (SAC/TC 35/SC 10).
Drafting organizations of this document: Fuzhou University, Fujian Polytechnic
Normal University, Fujian Sijia Environmental Protection Material Technology Co.,
Ltd., Shenyang Rubber Research and Design Institute Co., Ltd., Xiamen Kingtom
Rubber- or plastics-coated fabrics - Low-temperature bend
test
WARNING: Persons using this document should be familiar with normal
laboratory practice. This document does not purport to address all of the safety
problems, if any. It is the responsibility of the user to establish appropriate safety
and health practices and to ensure compliance with any national regulatory
conditions.
1 Scope
This document specifies a method for determining the ability of fabrics coated with
rubber or plastics to resist the effect of low temperature when subjected to bending at
specified temperatures after definite periods of exposure. This document is applicable
to coated fabrics with a thickness within the range 0.1 mm to 2.2 mm. For materials of
greater thickness than this, modifications to the standard equipment apply (see 9.2,
second paragraph).
Because fabrics coated with rubber or plastics are used in different applications
requiring low temperature flexing, this test cannot be used as the only standard to
determine their service performance.
2 Normative references
The contents of the following documents, through normative references in this text,
constitute indispensable provisions of this document. Among them, for dated references,
only the edition corresponding to that date applies to this document. For undated
references, the latest edition (including all amendments) applies to this document.
ISO 2231 Rubber- or plastics-coated fabrics - Standard atmospheres for conditioning
and testing
ISO 2286-3 Rubber- or plastics-coated fabrics - Determination of roll characteristics
- Part 3: Method for determination of thickness
3 Terms and definitions
No terms and definitions are listed in this document.
ISO maintains terminological databases for use in standardization at the following
address: