This file is in GB/T 1.1-2020 Standardization Guidelines Part 1: Rules for the structure and drafting of standardization Documents。

This document is part 1 of GB/T 18743 "Measurement of impact strength of simple supported beams for thermoplastic pipes"。GB/T 18743 has been released in the following parts:

- Part 1: General test methods;

-- Part 2: Test conditions for pipes of different materials。

This document and Part 2 of GB/T 18743 replace GB/T 18743-2002 "Impact test method for simple supported beams of thermoplastic pipes for fluid transport"，Compared with GB/T 18743-2002，Except for structural adjustments and editorial changes，The main technological changes are as follows:

a) The description of the scope of application of the standard has been changed，The deletion of this document applies to homopolymer and copolymer polypropylene pipes, unplasticized polyvinyl chloride pipes, modified high-impact polyvinyl chloride pipes, chlorinated polyvinyl chloride pipes, propylene wax-butadiene-styrene and propylene wax-stylene-acrylic pipes (see Chapter 1)，Chapter 1 of the 2002 edition);

b) Terms and definitions have been added (see Chapter 3),

c) The rationale has been changed (see Chapter 4, chapter 3 of the 2002 edition);

d) Added sample type 4 and sample type 5 for circular sampling (see Table 1,2002 edition);

e) Methods A, B and C have been added (see 6.2、6.3和6.4）；

f) Requirements and test methods for notched samples have been added (see 6.2、6.3）；

g) Changed the range of tube wall thickness corresponding to sample type 1 in method A (see 6.2.1，2002年版5.2.1）；

h) Remove the homopolymer and copolymer polypropylene pipe wall thickness greater than 10.Processing requirements for specimens at 5 mm (see 6.2.2，2002年 版 5.1）；

i) Changed the state adjustment time (see Table 4,2002 edition, Table 2).

Please note that some aspects of this document may involve patents。The issuing authority of this document is not responsible for the identification of patents。

范围

This document specifies a common test method for determining the impact strength of simple supported beams of thermoplastic pipes。

-- Method A: Using unnotched samples, the result is expressed as a percentage of the number of damaged samples to the total number of samples。

-- Method B: Use a single notch sample and express the result by impact strength。

-- Method C: Using double-notched samples, the results are expressed in terms of impact strength。

This document is applicable to the measurement of impact strength of thermoplastic pipe simple supported beam。

pantometricPlastic pendulum impact testing machineApplicable to this standard。Plastic pendulum impact testing machine The impact resistance of non-metallic materials such as plastic, nylon, rubber, glass fiber reinforced plastic, composite plastic pipes, electrical insulation materials under dynamic load is tested。