SIST EN ISO 75-1:2020
(Main)Plastics - Determination of temperature of deflection under load - Part 1: General test method (ISO 75-1:2020)
Plastics - Determination of temperature of deflection under load - Part 1: General test method (ISO 75-1:2020)
EN-ISO 75-1 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. 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. 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. The methods specify preferred dimensions for the test specimens.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. 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.
Kunststoffe - Bestimmung der Wärmeformbeständigkeitstemperatur - Teil 1: Allgemeines Prüfverfahren (ISO 75-1:2020)
1.1 Dieses Dokument legt ein allgemeines Prüfverfahren zur Bestimmung der Wärmeformbeständigkeits¬temperatur von Kunststoffen unter Last (Biegespannung unter Dreipunktbelastung) fest. Für verschiedene Werkstoffarten sind unterschiedliche Arten von Probekörpern und unterschiedliche konstante Lasten festgelegt.
1.2 ISO 75 2 legt spezielle Anforderungen an Kunststoffe (einschließlich gefüllte Kunststoffe und lang¬faserverstärkte Kunststoffe, bei denen die Faserlänge vor der Verarbeitung bis zu 7,5 mm beträgt) und Hartgummi fest, während ISO 75 3 spezielle Anforderungen an hochfeste, aushärtbare Schichtstoffe und langfaserverstärkte Kunststoffe festlegt, bei denen die Faserlänge vor der Verarbeitung mehr als 7,5 mm beträgt.
1.3 Die festgelegten Verfahren sind geeignet, das relative Verhalten verschiedener Werkstoffe bei erhöhter Temperatur abzuschätzen, wenn die Temperatur unter Belastung mit einer vorgegebenen Heizrate erhöht wird. Die erhaltenen Ergebnisse stellen nicht unbedingt die maximalen Gebrauchstemperaturen dar, weil sich in der Praxis wesentliche Faktoren wie Zeit, Belastungsbedingungen und nominelle Oberflächen¬spannung von den Prüfbedingungen unterscheiden können. Eine wirkliche Vergleichbarkeit der Daten kann nur bei Werkstoffen mit dem gleichen Biegemodul bei Raumtemperatur erreicht werden.
1.4 Die Verfahren legen Vorzugsmaße der Probekörper fest.
1.5 Die mit den beschriebenen Prüfverfahren ermittelten Daten sind nicht für eine Voraussage der Gebrauchstauglichkeit vorgesehen. Die Daten sind nicht zur Analyse der Gestaltung und Bemessung oder Vorhersage des Langzeitverhaltens (Lebensdauer) bei erhöhten Temperaturen von Werkstoffen vorgesehen.
1.6 Dieses Verfahren ist allgemein als Prüfung der Wärmestandfestigkeit bzw. Wärmeformbeständigkeit (HDT Prüfung, en: Heat Deflection Temperature bzw. Heat Distortion Temperature Test) bekannt, obwohl es kein offizielles Dokument gibt, in dem diese Benennung verwendet wird.
Plastiques - Détermination de la température de fléchissement sous charge - Partie 1: Méthode d'essai générale (ISO 75-1:2020)
1 Domaine d'application 1.1 Le présent document décrit une méthode d'essai générale permettant de déterminer la température de fléchissement sous charge (contrainte de flexion sous mise en charge en trois points) des plastiques. Différents types d'éprouvettes et différentes charges constantes sont définis pour correspondre à des types de matériaux différents.
1.2 L'ISO 75-2 fournit des exigences particulières pour les plastiques (incluant les plastiques chargés et les plastiques renforcés de fibres, dans lesquels la longueur de fibre avant l'emploi est inférieure ou égale à 7,5 mm) et l'ébonite, et l'ISO 75-3 fournit des exigences particulières pour les stratifiés thermodurcissables à haute résistance et les plastiques renforcés de fibres longues, dans lesquels la longueur de fibre avant l'emploi est supérieure à 7,5 mm.
1.3 Les méthodes spécifiées permettent d'évaluer le comportement relatif sous charge des divers types de matériaux à température élevée, avec une élévation de la température à une vitesse spécifiée. Les résultats obtenus ne représentent pas nécessairement les températures maximales d'utilisation car, dans la pratique, des facteurs essentiels tels que le temps, les conditions de mise en charge et la contrainte superficielle nominale peuvent différer des conditions adoptées pour l'essai. Une comparabilité exacte des données ne peut être obtenue que pour des matériaux ayant le même module de flexion à température ambiante.
1.4 Les méthodes spécifient les dimensions recommandées pour les éprouvettes.
1.5 Les données obtenues en utilisant les méthodes d'essais décrites ne sont pas destinées à être utilisées pour prédire de véritables performances d'usage. Les données ne sont pas destinées à être utilisées pour les analyses de conception ou pour prévoir la résistance des matériaux à des températures élevées.
1.6 La présente méthode est communément connue sous le nom d'essai de déformation à chaud ou de fléchissement à chaud (HDT) bien qu'il n'existe pas de document officiel utilisant cette désignation.
Polimerni materiali - Ugotavljanje temperature upogiba pod obremenitvijo - 1. del: Splošna preskusna metoda (ISO 75-1:2020)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 75-1:2020
01-junij-2020
Nadomešča:
SIST EN ISO 75-1:2013
Polimerni materiali - Ugotavljanje temperature upogiba pod obremenitvijo - 1. del:
Splošna preskusna metoda (ISO 75-1:2020)
Plastics - Determination of temperature of deflection under load - Part 1: General test
method (ISO 75-1:2020)
Kunststoffe - Bestimmung der Wärmeformbeständigkeitstemperatur - Teil 1: Allgemeines
Prüfverfahren (ISO 75-1:2020)
Plastiques - Détermination de la température de fléchissement sous charge - Partie 1:
Méthode d'essai générale (ISO 75-1:2020)
Ta slovenski standard je istoveten z: EN ISO 75-1:2020
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
SIST EN ISO 75-1:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 75-1:2020
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SIST EN ISO 75-1:2020
EN ISO 75-1
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2020
EUROPÄISCHE NORM
ICS 83.080.01 Supersedes EN ISO 75-1:2013
English Version
Plastics - Determination of temperature of deflection
under load - Part 1: General test method (ISO 75-1:2020)
Plastiques - Détermination de la température de Kunststoffe - Bestimmung der
fléchissement sous charge - Partie 1: Méthode d'essai Wärmeformbeständigkeitstemperatur - Teil 1:
générale (ISO 75-1:2020) Allgemeines Prüfverfahren (ISO 75-1:2020)
This European Standard was approved by CEN on 22 February 2020.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 75-1:2020 E
worldwide for CEN national Members.
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SIST EN ISO 75-1:2020
EN ISO 75-1:2020 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 75-1:2020
EN ISO 75-1:2020 (E)
European foreword
This document (EN ISO 75-1:2020) has been prepared by Technical Committee ISO/TC 61 "Plastics" in
collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2020, and conflicting national standards
shall be withdrawn at the latest by September 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 75-1:2013.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 75-1:2020 has been approved by CEN as EN ISO 75-1:2020 without any modification.
3
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SIST EN ISO 75-1:2020
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SIST EN ISO 75-1:2020
INTERNATIONAL ISO
STANDARD 75-1
Fourth edition
2020-02
Plastics — Determination of
temperature of deflection under
load —
Part 1:
General test method
Plastiques — Détermination de la température de fléchissement sous
charge —
Partie 1: Méthode d'essai générale
Reference number
ISO 75-1:2020(E)
©
ISO 2020
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SIST EN ISO 75-1:2020
ISO 75-1:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 75-1:2020
ISO 75-1:2020(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Principle . 3
5 Apparatus . 3
5.1 Means of producing a flexural stress . 3
5.2 Heating equipment . 4
5.3 Weights . 5
5.4 Temperature-measuring instrument . 5
5.5 Deflection-measuring instrument . 5
5.6 Micrometers and gauges . 5
6 Test specimens. 6
6.1 General . 6
6.2 Shape and dimensions . 6
6.3 Specimen inspection . 6
6.4 Number of test specimens . 6
7 Conditioning . 6
8 Procedure. 7
8.1 Calculation of force to be applied. 7
8.2 Initial temperature of the heating equipment . 8
8.3 Conducting the test . 8
9 Expression of results . 8
10 Precision . 9
11 Test report . 9
Bibliography .10
© ISO 2020 – All rights reserved iii
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SIST EN ISO 75-1:2020
ISO 75-1:2020(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
www .iso .org/ iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2,
Mechanical behavior, in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 249, Plastics, in accordance with the Agreement on technical cooperation between
ISO and CEN (Vienna Agreement).
This fourth edition cancels and replaces the third edition (ISO 75-1:2013), which has been technically
revised. The main changes compared to the previous edition are as follows:
— specification for the temperature difference between the middle and the ends of the test specimens
has been removed;
— specification for the position of the tip of the temperature sensor has been widened;
— editorial changes have been applied.
A list of all parts in the ISO 75 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
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SIST EN ISO 75-1:2020
INTERNATIONAL STANDARD ISO 75-1:2020(E)
Plastics — Determination of temperature of deflection
under load —
Part 1:
General test method
1 Scope
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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
ISO 75-2, Plastics — Determination of temperature of deflection under load — Part 2: Plastics and ebonite
ISO 75-3, Plastics — Determination of temperature of deflection under load — Part 3: High-strength
thermosetting laminates and long-fibre-reinforced plastics
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 16012, Plastics — Determination of linear dimensions of test specimens
IEC 60584-1, Thermocouples — Part 1: EMF specifications and tolerances
IEC 60751, Industrial platinum resistance thermometers and platinum temperature sensors
© ISO 2020 – All rights reserved 1
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SIST EN ISO 75-1:2020
ISO 75-1:2020(E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
flexural strain
ε
f
nominal fractional change in length of an element o
...
SLOVENSKI STANDARD
oSIST prEN ISO 75-1:2019
01-maj-2019
Polimerni materiali - Ugotavljanje temperature upogiba pod obremenitvijo - 1. del:
Splošna preskusna metoda (ISO/DIS 75-1:2019)
Plastics - Determination of temperature of deflection under load - Part 1: General test
method (ISO/DIS 75-1:2019)
Kunststoffe - Bestimmung der Wärmeformbeständigkeitstemperatur - Teil 1: Allgemeines
Prüfverfahren (ISO/DIS 75-1:2019)
Plastiques - Détermination de la température de fléchissement sous charge - Partie 1:
Méthode d'essai générale (ISO/DIS 75-1:2019)
Ta slovenski standard je istoveten z: prEN ISO 75-1:2019
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
oSIST prEN ISO 75-1:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN ISO 75-1:2019
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oSIST prEN ISO 75-1:2019
DRAFT INTERNATIONAL STANDARD
ISO/DIS 75-1
ISO/TC 61/SC 2 Secretariat: KATS
Voting begins on: Voting terminates on:
2019-03-07 2019-05-30
Plastics — Determination of temperature of deflection
under load —
Part 1:
General test method
Plastiques — Détermination de la température de fléchissement sous charge —
Partie 1: Méthode d'essai générale
ICS: 83.080.01
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 75-1:2019(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2019
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oSIST prEN ISO 75-1:2019
ISO/DIS 75-1:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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oSIST prEN ISO 75-1:2019
ISO/DIS 75-1:2019(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Principle . 3
5 Apparatus . 3
5.1 Means of producing a flexural stress . 3
5.2 Heating equipment . 3
5.3 Weights . 5
5.4 Temperature-measuring instrument . 5
5.5 Deflection-measuring instrument . 5
5.6 Micrometers and gauges . 5
6 Test specimens. 5
6.1 General . 5
6.2 Shape and dimensions . 6
6.3 Specimen inspection . 6
6.4 Number of test specimens . 6
7 Conditioning . 6
8 Procedure. 6
8.1 Calculation of force to be applied. 6
8.2 Initial temperature of the heating equipment . 7
8.3 Procedure . 7
9 Expression of results . 8
10 Precision . 8
11 Test report . 8
© ISO 2019 – All rights reserved iii
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oSIST prEN ISO 75-1:2019
ISO/DIS 75-1:2019(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International
Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies
casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 75-1 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical
properties.
This third edition cancels and replaces the second edition (ISO 75-1:2013), which has been technically
revised.
Main issues of the revision are:
— Specification for the temperature difference between the middle and the ends of the test specimens
has been removed
— Specification for the position of the tip of the temperature sensor has been widened
— Editorial changes
ISO 75 consists of the following parts, under the general title Plastics — Determination of temperature of
deflection under load:
— Part 1: General test method
— Part 2: Plastics and ebonite
— Part 3: High-strength thermosetting laminates and long-fibre-reinforced plastics
iv © ISO 2019 – All rights reserved
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oSIST prEN ISO 75-1:2019
ISO/DIS 75-1:2019(E)
Introduction
The first editions of this part of ISO 75 and ISO 75-2 described three methods (A, B and C) using different
test loads and two specimen positions, edgewise and flatwise. For testing in the flatwise position, test
specimens with dimensions 80 mm × 10 mm × 4 mm were required. These can be moulded directly or
machined from the central section of the multipurpose test specimen (see ISO 20753).
The previous (i.e. second) editions of this part of ISO 75 and ISO 75-2 specified the flatwise test position
as preferred, while still allowing testing in the edgewise position with the test conditions given in
Annex A until the next revision of this part of ISO 75 and ISO 75-2, as agreed in ISO/TC 61/SC 2/WG 5.
Therefore, with this revision, the edgewise test position will be removed.
At the time of publication, technical development of testing instruments made instruments based on a
fluidized bed or air ovens available. These are especially advantageous for use at temperatures at which
the common silicone oil-based heat transfer fluids reach their limit of thermal stability. The fluidized
bed and air oven methods of heat transfer are introduced in this part of ISO 75.
An additional precision statement covering the new heating methods is introduced in ISO 75-2.
© ISO 2019 – All rights reserved v
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oSIST prEN ISO 75-1:2019
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oSIST prEN ISO 75-1:2019
DRAFT INTERNATIONAL STANDARD ISO/DIS 75-1:2019(E)
Plastics — Determination of temperature of deflection
under load —
Part 1:
General test method
1 Scope
1.1 This part of ISO 75 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 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 HDT test (heat deflection test or heat distortion test),
although there is no official document using this designation.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 75-2, Plastics — Determination of temperature of deflection under load — Part 2: Plastics and ebonite
ISO 75-3, Plastics — Determination of temperature of deflection under load — Part 3: High-strength
thermosetting laminates and long-fibre-reinforced plastics
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 16012, Plastics — Determination of linear dimensions of test specimens
ISO 20753, Plastics — Test specimens
IEC 60584-1, Thermocouples-Part 1: EMF specifications and tolerances
© ISO 2019 – All rights reserved 1
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oSIST prEN ISO 75-1:2019
ISO/DIS 75-1:2019(E)
ASTM E608/E608M-13, Standard Specification for Mineral-Insulated, Metal-Sheathed Base Metal
Thermocouples
ASTM E1137/E1137M-08(2014), Standard Specification for Industrial Platinum Resistance Thermometers
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
flexural strain
ε
f
nominal fractional change in length of an element of the outer surface of the test specimen at midspan
Note 1 to entry: It is expressed as a dimensionless ratio or a percentage (%).
3.2
flexural strain increase
Δε specified increase in flexural strain that takes place during heating
f
Note 1 to entry: It is expressed as a percentage (%).
3.3
deflection
s
distance over which the top or bottom surface of the test specimen at midspan deviates during flexure
from its original position
Note 1 to entry: It is expressed in millimetres (mm).
3.4
standard deflection
Δsincrease in deflection corresponding to the flexural strain increase, Δε , at the surface of the test
f
specimen, and which is specified in ISO 75-2 or ISO 75-3
Note 1 to entry: It is expressed in millimetres (mm) [see 8.3, Formula (4)].
3.5
flexural stress
σ
f
nominal stress at the outer surface of the test specimen at midspan
Note 1 to entry: It is expressed in megapascals (MPa).
3.6
load
F
force, applied to the test specimen at midspan, which results in a defined flexural stress
Note 1 to entry: It is expressed in newtons (N) [see 8.1, Formulae (1) to (3)].
3.7
temperature of deflection under load
T
f
temperature at which the deflection of the test specimen reaches
...
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