EN ISO 75-1:1996

SLOVENSKI STANDARD
SIST EN ISO 75-1:2000
01-maj-2000
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Plastics - Determination of temperature of deflection under load - Part 1: General test
method (ISO 75-1:1993)
Kunststoffe - Bestimmung der Wärmeformbeständigkeitstemperatur - Teil 1: Allgemeine
Prüfmethode (ISO 75-1:1993)
Plastiques - Détermination de la température de fléchissement sous charge - Partie 1:
Méthode générale d'essai (ISO 75-1:1993)
Ta slovenski standard je istoveten z: EN ISO 75-1:1996
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
SIST EN ISO 75-1:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 75-1:2000

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SIST EN ISO 75-1:2000

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SIST EN ISO 75-1:2000

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SIST EN ISO 75-1:2000
IS0
INTERNATIONAL
75-l
STANDARD
First edition
1993-09-15
Plastics - Determination of temperature
of deflection under load -
Part 1:
General test method
P/as tiques - 06termination de la temperature de fkhissement sous
charge -
Partie 1: Mbthode g&n&ale d ’essai
Reference number
IS0 75-l :1993(E)

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SIST EN ISO 75-1:2000
IS0 75=1:1993(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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. IS0
collaborates closely with the International Electrotechnical Commission
(I EC) on all matters of electrotechnical standardization.
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.
International Standard IS0 75-l was prepared by Technical Committee
ISOnC 61 I Plastics, Sub-Committee SC 2, Mechanical properties.
Together with the other parts, it cancels and replaces the second edition
of IS0 75 (IS0 75:1987), which has been technically revised.
IS0 75 consists of the followi parts, under the genera I title Plastics -
ng
Determination of temperature of deflec tion under load:
- Part 1: General test method
- Part 2: Plastics and ebonite
- Part 3: High-strength thermosetting laminates and long-fibre-
reinforced p/as tics
0 IS0 1993
All rights reserved. No part of this publication may be reproduced or utilized in any form or
by any means, electronic or mechanical, including photocopying and microfilm, without per-
mission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii

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SIST EN ISO 75-1:2000
IS0 75=1:1993(E)
INTERNATIONAL STANDARD
Plastics - Determination of temperature of deflection
under load -
Part 1:
General test method
IS0 291 :1977, plastics - Standard atmospheres for
1 Scope
conditioning and testing.
1.1 IS0 75 specifies methods for the determination
of the temperature of deflection under load (bending
stress under three-point loading) of different types of
3 Definitions
material.
For the purposes of this and the other parts of
IS0 75, the following definitions apply.
1.2 Part 1 of IS0 75 gives a general test method,
part 2 gives specific requirements for plastics and
3.1 deflection: The distance, at mid-span, over
ebonite and part 3 gives specific requirements for
which the top or bottom surface of a test specimen
high-strength thermosetting laminates and long-fibre-
deviates, during flexure, from its original position. It is
reinforced plastics.
expressed in millimetres.
3.2 standard deflection S: The deflection which will
1.3 The methods specified are suitable for assess-
result in the flexural strain, at the surface of the test
ing the behaviour of the different types of material at
specimen, which is specified in the relevant part of
elevated temperature under load at a specified rate
this International Standard. The standard deflection
of temperature increase. The results obtained do not
depends on the dimensions and position of the test
necessarily represent maximum use temperatures,
specimen and the span between the supports. It is
because in practice essential factors such as time,
loading conditions and nominal surface stress may expressed in millimetres.
differ from the test conditions.
3.3 temperature of deflection under load, T,: The
temperature at which the deflection of the test
specimen reaches the standard deflection as the
2 Normative reference
temperature is increased. It is expressed in degrees
Celsius.
The following standard contains provisions which,
through reference in this text, constitute provisions
3.4 flexural strain: The nominal fractional change in
of this part of IS0 75. At the time of publication, the
length of an element at the surface of the test speci-
edition indicated was valid. All standards are subject
men at mid-span. It is expressed as a dimensionless
to revision, and parties to agreements based on this
quantity.
part of IS0 75 are encouraged to investigate the pos-
sibility of applying the most recent edition of the
standard indicated below. Members of IEC and IS0 3.5 flexural stress, 0: The nominal stress at the
maintain registers of currently valid International surface of the test specimen at mid-span. It is ex-
pressed in megapascals.
Standards.
1

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SIST EN ISO 75-1:2000
IS0 75=1:1993(E)
4 Principle 5 Apparatus
5.1 Means of applying a bending stress
The apparatus shall be constructed essentially as
shown in figure 1. It consists of a rigid metal frame in
A standard test specimen is subjected to a bending
which a rod can move freely in the vertical direction.
stress to produce one of the nominal surface stresses
The rod is fitted with a weight-carrying plate and a
given in the relevant part of this International Stan-
loading edge. The base of the frame is fitted with
dard. The temperature is raised at a uniform rate, and
test-specimen supports;. these and the vertical mem-
the temperature at which a specified deflection
oc-
bers of the frame are made of a metal having the
curs is measured.
same coefficient of linear expansion as the rod.
X X
Test specimen edgewise
Test specimen flatwise
b
L-4
- Typical apparatus for determination of temperature of deflection under load
Figure 1

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SIST EN ISO 75-1:2000
IS0 75=1:1993(E)
The test-specimen supports consist of cylindrical stable over the temperature range used and does not
metal pieces at a distance apart defined in the rel- affect the material under test, for example causing it
evant part of this International Standard and with their to swell or crack.
lines of contact with the specimen in a horizontal
NOTE 3 Liquid paraffin, transformer oil, glycerol and
plane. The supports are fitted to the base of the frame
silicone oils are suitable liquid heat-transfer media, but other
in such a way that the vertical force applied to the test
liquids may be used.
specimen by the loading edge is midway between
them. The contact edges of the supports are parallel
5.2.2 Oven, with forced air or nitrogen circulation of
to the loading edge and at right angles to the length
about 60 times per minute; with a volume of not less
direction of a test specimen placed symmetrically
than 10 litres per specimen holder (see 5.1), and with
across them. The contact edges of the supports and
the air or nitrogen flow directed horizontally, perpen-
loading edge are rounded to a radius of
dicular to the length of the specimen, at a speed of
3,0 mm + 0,2 mm and shall be longer than the width
1,5 m/s to 2 m/s.
of the test specimen.
Unless vertical parts of the apparatus have the same
NOTE 4 Commercially available ovens are often fitted
with suitable air or nitrogen circulation equipment. If not, the
coefficient of linear expansion, the differential change
necessary heat-transfer conditions may be ensured by fit-
in the length of these parts introduces an error in the
ting guide-vanes to direct the air or nitrogen flow horizon-
reading of the apparent deflection of the test speci-
tally across the specimen.
men. A blank test shall be made on each apparatus
using a test specimen made of rigid material having
a low coefficient of expansion. The blank test shall
5.3 Weights
cover the temperature ranges to be used in the actual
determination, and a correction term shall be deter-
A set of weights shall be provided so that the test
mined for each temperature. If the correction term is
specimen can be loaded to the required nominal sur-
0,010 mm or greater, its value and algebraic sign shall
face stress, calculated as specified in 8.1.
be noted and the term applied to each test by adding
it algebraically to the reading of the apparent de-
NOTE 5 It may be necessary to adjust these weights in
f
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