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Norm

ISO 75-1:2020

Issue date: 2020 02 28

Plastics — Determination of temperature of deflection under load — Part 1: General test method

1.1 This document gives a general test method for the determination of the temperature of deflection under load (flexural stress under three-point loading) of plastics. ...
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Publisher:
International Organization for Standardization
Format:
Digital | 10 Pages
Language:
English

1.1 This document gives 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.

1.2 ISO 75-2 gives 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 ISO 75-3 gives specific requirements for high-strength thermosetting laminates and long-fibre-reinforced plastics in which the fibre length, prior to processing, is greater than 7,5 mm.

1.3 The methods specified are 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.

1.4 The methods specify preferred dimensions for the test specimens.

1.5 Data obtained using the test methods described are not intended to be used to predict actual end-use performance. The data are not intended for design analysis or prediction of the endurance of materials at elevated temperatures.

1.6 This method is commonly known as the heat deflection temperature or heat distortion temperature (HDT) test, although there is no official document using this designation.

ISO 75-1:2020
2020 02 28
Plastics — Determination of temperature of deflection under load — Part 1: General test method
Norm
ISO 75-1:2013
2013 04 09
Plastics — Determination of temperature of deflection under load — Part 1: General test method
Norm
ISO 75-1:2004
2004 05 12
Plastics — Determination of temperature of deflection under load — Part 1: General test method
Norm
ISO 75-1:1993
1993 08 26
Plastics — Determination of temperature of deflection under load — Part 1: General test method
Norm
ISO 75:1987
1987 03 26
Plastics and ebonite — Determination of temperature of deflection under load
Norm
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