GB/T 1634.1-2019: Plastics -- Determination of temperature of deflection under load -- Part 1: General test method

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Scope

This Part of GB/T 1634 gives a test method for the determination of the
temperature of deflection under load (flexural stress under three-point loading)
of plastics. Different types of test specimen and different constant loads are
defined to suit different types of material.
GB/T 1634.2 gives specific requirements for plastics (including filled plastics
and fibre-reinforced plastics in which the fibre length is up to 7.5 mm) and
ebonite, while GB/T 1634.3 gives specific requirements for high-strength
thermosetting laminates.
This Part is suitable for assessing the relative behaviour of different types of
material at elevated temperature under load at a specified rate of temperature
increase. The results obtained do not necessarily represent maximum
applicable temperatures because in practice essential factors, such as time,
loading conditions and nominal surface stress, can differ from the test
conditions. True comparability of data can only be achieved for materials having
the same room-temperature flexural modulus.
This Part specifies preferred dimensions for the test specimens used. This Part
is commonly known as the HDT test (heat deflection test or heat distortion test),
although there is no official document using this designation.

Basic Data

Standard ID	GB/T 1634.1-2019 (GB/T1634.1-2019)
Description (Translated English)	Plastics -- Determination of temperature of deflection under load -- Part 1: General test method
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G31
Classification of International Standard	83.080.01
Word Count Estimation	10,167
Date of Issue	2019-05-10
Date of Implementation	2020-04-01
Issuing agency(ies)	State Administration for Market Regulation, China National Standardization Administration