SIST EN ISO 75-1:2013

Plastics - Determination of temperature of deflection under load - Part 1: General test method (ISO 75-1:2013)

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. 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. 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 HDT test (heat deflection test or heat distortion test), although there is no official document using this designation.

Kunststoffe - Bestimmung der Wärmeformbeständigkeitstemperatur - Teil 1: Allgemeines Prüfverfahrenn (ISO 75-1:2013)

1.1 ISO 75 legt Verfahren zur Bestimmung der Wärmeformbeständigkeitstemperatur von Kunststoffen unter
Last (Biegespannung unter Dreipunktbelastung) fest. Für verschiedene Materialienarten sind unterschiedliche
Probekörper und unterschiedliche konstante Lasten festgelegt.
1.2 Dieser Teil von ISO 75 legt ein allgemeines Prüfverfahren fest, Teil 2 legt spezielle Anforderungen an
Kunststoffe (einschließlich gefüllte Kunststoffe und langfaserverstärkte Kunststoffe, bei denen die Faserlänge
vor der Verarbeitung bis zu 7,5 mm beträgt) und Hartgummi fest, während Teil 3 spezielle Anforderungen an
hochfeste, aushärtbare Schichtstoffe und langfaserverstärkte Kunststoffe festlegt, bei denen die Faserlänge
mehr als 7,5 mm beträgt.
1.3 Die festgelegten Verfahren sind geeignet, das relative Verhalten verschiedener Materialien 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 Biegespannung von den Prüfbedingungen
unterscheiden können. Eine wirkliche Vergleichbarkeit der Daten kann nur bei Materialien mit
dem gleichen Biegemodul bei Raumtemperatur erreicht werden.
1.4 Die Verfahren legen Vorzugsmaße der Probekörper fest. Prüfungen an Probekörpern mit unterschiedlichen
Maßen oder an Probekörpern, die unter unterschiedlichen Bedingungen hergestellt wurden, können
unterschiedliche Ergebnisse hervorbringen. Konsequenterweise sollten daher, wenn vergleichbare Werte
erforderlich sind, die Herstellungsbedingungen der Probekörper und die Prüfvariablen sorgfältig geprüft und
aufgezeichnet werden.
1.5 Die mit den beschriebenen Prüfverfahren ermittelten Daten dürfen nicht für eine Voraussage der
Gebrauchstauglichkeit verwendet werden. Die Daten sind nicht für die Analyse von Gestaltung und
Bemessung oder Vorhersage des Langzeitverhaltens (Lebensdauer) von Materialien vorgesehen
1.6 Dieses Verfahren ist allgemein als HDT-Prüfung (en: Heat Deflection Test oder Heat Distortion 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 75-1:2013)

L'ISO 75-1:2013 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.

Polimerni materiali - Ugotavljanje temperature upogiba pod obremenitvijo - 1. del: Splošna preskusna metoda (ISO 75-1:2013)

Ta del ISO 75 podaja splošno preskusno metodo za določanje temperature upogiba pod obremenitvijo (upogibna napetost pri tritočkovni obremenitvi) polimernih materialov. Različne vrste preskusnega vzorca in različna stalna bremena so določena tako, da ustrezajo različnim vrstam materiala. ISO 75-2 podaja posebne zahteve za polimerne materiale (vključno s polnjenimi polimernimi materiali in z vlakni ojačenimi polimernimi materiali, v katerih dolžina vlaken pred obdelavo meri do 7,5 mm) in ebonit, ISO 75-3 pa podaja posebne zahteve za duromerne laminate z visoko trdnostjo in z dolgimi vlakni ojačene polimere z dolžino vlaken, večjo od 7,5 mm. Navedene metode so primerne za ocenjevanje relativnega obnašanja različnih vrst materiala pri povišani temperaturi pod obremenitvijo pri določeni stopnji povečanja temperature. Pridobljeni rezultati ne predstavljajo nujno najvišje temperature uporabe, ker se v praksi ključni dejavniki, kot so čas, pogoji obremenitve in nominalna napetost površine, razlikujejo od preskusnih pogojev. Prava primerjava podatkov se lahko doseže pri materialih, ki imajo enak upogibni modul pri sobni temperaturi. Metode določajo prednostne dimenzije preskusnih vzorcev. Opisani podatki, pridobljeni s preskušanjem, niso namenjeni za predvidevanje dejanskega delovanja pri končni uporabi. Podatki niso namenjeni za analizo načrtovanja ali za napovedovanje vzdržljivosti materialov pri povišanih temperaturah. Ta metoda je splošno znana kot preskus HDT (preskus temperaturnega upogiba ali preskus temperaturnega popačenja), čeprav uradni dokument s tem poimenovanjem ne obstaja.

General Information

• Status: Withdrawn
• Public Enquiry End Date: 24-Apr-2012
• Publication Date: 04-Jul-2013
• Withdrawal Date: 31-Mar-2020
• ICS: 83.080.01 - Plastics in general
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 01-Apr-2020
• Due Date: 24-Apr-2020
• Completion Date: 01-Apr-2020
• Ref Project: EN ISO 75-1:2013 - Plastics - Determination of temperature of deflection under load - Part 1: General test method (ISO 75-1:2013)

Relations

• Replaced By: SIST EN ISO 75-1:2020 - Plastics - Determination of temperature of deflection under load - Part 1: General test method (ISO 75-1:2020)
• Effective Date: 24-Mar-2020
• Revised: SIST EN ISO 75-1:2004 - Plastics - Determination of temperature of deflection under load - Part 1: General test method (ISO 75-1:2004)
• Effective Date: 13-Nov-2010
• Replaced By: SIST EN ISO 75-1:2020 - Plastics - Determination of temperature of deflection under load - Part 1: General test method (ISO 75-1:2020)
• Effective Date: 08-Jun-2022
• Replaces: SIST EN ISO 75-1:2004 - Plastics - Determination of temperature of deflection under load - Part 1: General test method (ISO 75-1:2004)
• Effective Date: 01-Sep-2013
• Revised: SIST EN ISO 75-1:2020 - Plastics - Determination of temperature of deflection under load - Part 1: General test method (ISO 75-1:2020)
• Effective Date: 26-Dec-2018
• Replaces: SIST EN ISO 75-1:2004 - Plastics - Determination of temperature of deflection under load - Part 1: General test method (ISO 75-1:2004)
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 75-1:2013
01-september-2013
1DGRPHãþD
SIST EN ISO 75-1:2004
Polimerni materiali - Ugotavljanje temperature upogiba pod obremenitvijo - 1. del:
Splošna preskusna metoda (ISO 75-1:2013)
Plastics - Determination of temperature of deflection under load - Part 1: General test
method (ISO 75-1:2013)
Kunststoffe - Bestimmung der Wärmeformbeständigkeitstemperatur - Teil 1: Allgemeines
Prüfverfahrenn (ISO 75-1:2013)
Plastiques - Détermination de la température de fléchissement sous charge - Partie 1:
Méthode d'essai générale (ISO 75-1:2013)
Ta slovenski standard je istoveten z: EN ISO 75-1:2013
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
SIST EN ISO 75-1:2013 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN ISO 75-1:2013

---------------------- Page: 2 ----------------------

SIST EN ISO 75-1:2013


EUROPEAN STANDARD
EN ISO 75-1

NORME EUROPÉENNE

EUROPÄISCHE NORM
April 2013
ICS 83.080.01 Supersedes EN ISO 75-1:2004
English Version
Plastics - Determination of temperature of deflection under load
- Part 1: General test method (ISO 75-1:2013)
Plastiques - Détermination de la température de Kunststoffe - Bestimmung der
fléchissement sous charge - Partie 1: Méthode d'essai Wärmeformbeständigkeitstemperatur - Teil 1: Allgemeines
générale (ISO 75-1:2013) Prüfverfahren (ISO 75-1:2013)
This European Standard was approved by CEN on 21 March 2013.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 75-1:2013: E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------

SIST EN ISO 75-1:2013
EN ISO 75-1:2013 (E)
Contents Page
Foreword .3
2

---------------------- Page: 4 ----------------------

SIST EN ISO 75-1:2013
EN ISO 75-1:2013 (E)
Foreword
This document (EN ISO 75-1:2013) 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 October 2013, and conflicting national standards shall be withdrawn at
the latest by October 2013.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 75-1:2004.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 75-1:2013 has been approved by CEN as EN ISO 75-1:2013 without any modification.
3

---------------------- Page: 5 ----------------------

SIST EN ISO 75-1:2013

---------------------- Page: 6 ----------------------

SIST EN ISO 75-1:2013
INTERNATIONAL ISO
STANDARD 75-1
Third edition
2013-04-15
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 75-1:2013(E)
©
ISO 2013

---------------------- Page: 7 ----------------------

SIST EN ISO 75-1:2013
ISO 75-1:2013(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2013
All rights reserved. Unless otherwise specified, 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
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved

---------------------- Page: 8 ----------------------

SIST EN ISO 75-1:2013
ISO 75-1:2013(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
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. 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 Measurement . 8
9 Expression of results . 9
10 Precision . 9
11 Test report . 9
© ISO 2013 – All rights reserved iii

---------------------- Page: 9 ----------------------

SIST EN ISO 75-1:2013
ISO 75-1:2013(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 75-1:2004), which has been technically
revised.
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 2013 – All rights reserved

---------------------- Page: 10 ----------------------

SIST EN ISO 75-1:2013
ISO 75-1:2013(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 2013 – All rights reserved v

---------------------- Page: 11 ----------------------

SIST EN ISO 75-1:2013

---------------------- Page: 12 ----------------------

SIST EN ISO 75-1:2013
INTERNATIONAL STANDARD ISO 75-1:2013(E)
Plastics — Determination of temperature of deflection
under load —
Part 1:
General test method
1 Scope
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.
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.
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 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 20753, Plastics — Test specimens
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
© ISO 2013 – All rights reserved 1

---------------------- Page: 13 ----------------------

SIST EN ISO 75-1:2013
ISO 75-1:2013(E)

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
f
specified increase in flexural strain that takes place during heating
Note 1 to entry: It is expressed as a percentage (%).
Note 2 to entry:
...

SLOVENSKI STANDARD
oSIST prEN ISO 75-1:2012
01-april-2012
Polimerni materiali - Ugotavljanje temperature upogiba pod obremenitvijo - 1. del:
Splošna preskusna metoda (ISO/DIS 75-1:2012)
Plastics - Determination of temperature of deflection under load - Part 1: General test
method (ISO/DIS 75-1:2012)
Kunststoffe - Bestimmung der Wärmeformbeständigkeitstemperatur - Teil 1: Allgemeines
Prüfverfahrenn (ISO/DIS 75-1:2012)
Plastiques - Détermination de la température de fléchissement sous charge - Partie 1:
Méthode d'essai générale (ISO/DIS 75-1:2012)
Ta slovenski standard je istoveten z: prEN ISO 75-1
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
oSIST prEN ISO 75-1:2012 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN ISO 75-1:2012

---------------------- Page: 2 ----------------------
oSIST prEN ISO 75-1:2012


EUROPEAN STANDARD
DRAFT
prEN ISO 75-1
NORME EUROPÉENNE

EUROPÄISCHE NORM

January 2012
ICS 83.080.01 Will supersede EN ISO 75-1:2004
English Version
Plastics - Determination of temperature of deflection under load
- Part 1: General test method (ISO/DIS 75-1:2012)
Plastiques - Détermination de la température de Kunststoffe - Bestimmung der
fléchissement sous charge - Partie 1: Méthode d'essai Wärmeformbeständigkeitstemperatur - Teil 1: Allgemeines
générale (ISO/DIS 75-1:2012) Prüfverfahrenn (ISO/DIS 75-1:2012)
This draft European Standard is submitted to CEN members for parallel enquiry. It has been drawn up by the Technical Committee
CEN/TC 249.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

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.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN ISO 75-1:2012: E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------
oSIST prEN ISO 75-1:2012
prEN ISO 75-1:2012 (E)
Contents Page
Foreword .3

2

---------------------- Page: 4 ----------------------
oSIST prEN ISO 75-1:2012
prEN ISO 75-1:2012 (E)
Foreword
This document (prEN ISO 75-1:2012) 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 document is currently submitted to the parallel Enquiry.
This document will supersede EN ISO 75-1:2004.
Endorsement notice
The text of ISO/DIS 75-1:2012 has been approved by CEN as a prEN ISO 75-1:2012 without any modification.

3

---------------------- Page: 5 ----------------------
oSIST prEN ISO 75-1:2012

---------------------- Page: 6 ----------------------
oSIST prEN ISO 75-1:2012

DRAFT INTERNATIONAL STANDARD ISO/DIS 75-1
ISO/TC 61/SC 2 Secretariat: AENOR
Voting begins on Voting terminates on

2012-01-12 2012-06-12
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION    МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ    ORGANISATION INTERNATIONALE DE NORMALISATION


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
[Revision of second edition (ISO 75-1:2004)]
ICS 83.080.01


ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for Standardization (ISO), and
processed under the ISO-lead mode of collaboration as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member bodies for a parallel
five-month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments received, will be
submitted to a parallel two-month approval vote in ISO and formal vote in CEN.


To expedite distribution, this document is circulated as received from the committee
secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at
publication stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.



THIS DOCUMENT IS A DRAFT CIRCULATED 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 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 NATIONAL REGULATIONS.
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.
©  International Organization for Standardization, 2012

---------------------- Page: 7 ----------------------
oSIST prEN ISO 75-1:2012
ISO/DIS 75-1

Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
under the applicable laws of the user’s country, neither this ISO draft nor any extract from it may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic,
photocopying, recording or otherwise, without prior written permission being secured.
Requests for permission to reproduce should be addressed to either ISO at the address below or ISO’s
member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.

ii © ISO 2012 – All rights reserved

---------------------- Page: 8 ----------------------
oSIST prEN ISO 75-1:2012

Contents Page
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 3
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 Measurement . 7
9 Expression of results . 8
10 Precision . 8
11 Test report . 8

---------------------- Page: 9 ----------------------
oSIST prEN ISO 75-1:2012

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 second/third/. edition cancels and replaces the first/second/. edition (ISO 75-1:2004), [clause(s) /
subclause(s) / table(s) / figure(s) / annex(es)] of which [has / have] been technically revised.
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

---------------------- Page: 10 ----------------------
oSIST prEN ISO 75-1:2012

Introduction
ISO 75-1:1993 and ISO 75-2:1993 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 or ISO 3167).
ISO 75-1:2004 and ISO 75-2:2004 specified the flatwise test position as preferred, while still allowing testing in the
edgewise position with test conditions given in Annex A until the next revision of this document, as agreed in
ISO/TC 61/SC2/WG 5. Therefore, with this revision, the edgewise test position will be removed.
Technical development of testing instruments in recent years 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 revision.
An additional precision statement covering the new heating methods is introduced in Part 2.

---------------------- Page: 11 ----------------------
oSIST prEN ISO 75-1:2012

---------------------- Page: 12 ----------------------
oSIST prEN ISO 75-1:2012

DRAFT INTERNATIONAL STANDARD ISO/DIS 75-1

1 Scope
1.1 ISO 75 specifies methods 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 This part of ISO 75 gives a general test method, part 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 part 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 may 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. Tests which are carried out on
specimens of different dimensions, or on specimens which are prepared under different conditions, may
produce different results. Consequently, when repeatable data are required, sample preparation conditions
and test variables should be carefully controlled and recorded.
1.5 Data obtained using the test methods described may not be used to predict actual end-use
performance. The data are not intended for design analysis or predicting the endurance of materials at
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 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.
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 20753, Plastics — Test specimens
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 mid-span
NOTE It is expressed as a dimensionless ratio or a percentage (%).
© ISO 2011 – All rights reserved 1

---------------------- Page: 13 ----------------------
oSIST prEN ISO 75-1:2012
3.2

flexural strain increase
Δε
f
specified increase in flexural strain that takes place during heating
NOTE 1 It is expressed as a percentage (%).
NOTE 2 This quantity has been introduced to highlight the fact that the initial deflection caused by application of the
test load is not measured and that therefore the criterion for the end of the test does not constitute an absolute strain
value. Only the deflection increase is monitored (see also 3.4). This new quantity does not change the test or evaluation
procedure compared to older editions of
...