Standard No.:	GB/T 1634.1-2019
Chinese Name:	塑料 负荷变形温度的测定 第1部分:通用试验方法
English Name:	Plastics—Determination of temperature of deflection under load—Part 1:General test method
Professional Classification:	G31 Basic standards and general methods for synthetic resin and plastic
ICS Classification:	83.080.01 Plastics in general
Issued by:
Issued on:	2019-05-10
Implemented on:	2020-04-01
Status:	VALID
Replace:	GB/T1634.1-2004 Plastics—Determiantion of temperature of deflection under load—Part 1:General test method
Language:	English
File Format:	PDF
Word Count:	6000 words
Price(USD):	180 (USD)
Delivery:	via email in 1-3 business day

1 Scope

This part of GB/T 1634 specifies a general 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 specifies specific requirements for plastics (including filled plastics and fibre-reinforced plastics in which the fibre length, prior to processing, is up to 7.5 mm) and ebonite, while GB/T 1634.3 specifies specific requirements for high-strength thermosetting laminates and long-fibre-reinforced plastics in which the fibre length is greater than 7.5 mm.

This part is applicable to the 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. 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.

2 Normative References

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 1634.2 Plastics — Determination of Temperature of Deflection under Load — Part 2: Plastics, Ebonite and Long-fibre-reinforced (GB/T 1634.2-2019, ISO 75-2:2013, MOD)
GB/T 1634.3 Plastics — Determination of Temperature of Deflection under Load — Part 3: High-strength Thermosetting Laminates (GB/T 1634.2-2004, ISO 75-3:2003, IDT)