GB/T 1634.2-2004
Plastics-Determination of temperature of deflection under load-Part 2:Plastics,ebonite and long-fibre-reinforced composites (English Version)

Standard No.

GB/T 1634.2-2004

Language

Chinese, Available in English version

Release Date

2004

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Status

Be replaced 2020-04

Replace By

GB/T 1634.2-2019

Latest

GB/T 1634.2-2019

Replace

GB/T 1634-1979

Scope

This part of GB/T 1634 specifies three methods for determining the deformation temperature under load of plastics, hard rubber and long-fiber reinforced composite materials using different constant bending stress values, namely——method A using bending stress of 1.80 Mpa;—— Method B using a bending stress of 0.45 Mpa; - Method C using a bending stress of 8.00 Mpa. The standard deflection △s used to determine the load deflection temperature corresponds to the bending strain increment △εf specified in this part of GB/T 1634. The initial bending strain due to the load at room temperature cannot be specified in this part of GB/T 1634. , also cannot be measured. The ratio of this difference in bending strain to the initial bending strain depends on the room temperature modulus of elasticity of the material under test. Therefore, this method is only suitable for comparing the load deflection temperature of materials with similar elastic properties at room temperature. NOTE: This method has better reproducibility for amorphous plastics than for partially crystalline plastics. Certain materials may require annealing of the specimens for reliable test results. If an annealing procedure is used, this usually results in an increase in the load deflection temperature (see 6.6). For other information, see Chapter 1 of GB/T 1634.1-2004.

GB/T 1634.2-2004 history

• 2019 GB/T 1634.1-2019 Plastics—Determination of temperature of deflection under load—Part 1:General test method
• 2004 GB/T 1634.1-2004 Plastics-Determination of temperature of deflection under load-Part 1:General test method
• 1979 GB/T 1634-1979 Test method of heat deflection temperature under bending load for plastics

GB/T 1634.2-2004 Plastics-Determination of temperature of deflection under load-Part 2:Plastics,ebonite and long-fibre-reinforced composites has been changed from GB/T 1634-1979 Test method of heat deflection temperature under bending load for plastics.

GB/T 1634.2-2004 -All Parts