EN ISO 306:1996

SLOVENSKI STANDARD
SIST EN ISO 306:2000
01-maj-2000
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967,62
Plastics - Thermoplastic materials - Determination of Vicat softening temperature (VST)
(ISO 306:1994)
Kunststoffe - Thermoplaste - Bestimmung der Vicat-Erweichungstemperatur (VST) (ISO
306:1996)
Plastiques - Matieres thermoplastiques - Détermination de la température de
ramollissement Vicat (VST) (ISO 306:1994)
Ta slovenski standard je istoveten z: EN ISO 306:1996
ICS:
83.080.20 Plastomeri Thermoplastic materials
SIST EN ISO 306:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 306:2000

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SIST EN ISO 306:2000

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SIST EN ISO 306:2000

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SIST EN ISO 306:2000
INTERNATIONAL
IS0
STANDARD 306
Third edition
1994-08-01
Plastics - Thermoplastic materials -
Determination of Vicat softening
temperature (VST)
Plastiques - Mat&es thermoplastiques - Ddtermination de la
temperature de ramollissemen t Vita t (VST)
Reference number
IS0 306:1994(E)

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SIST EN ISO 306:2000
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
(IEC) 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 YO of the member bodies casting
a vote.
International Standard IS0 306 was prepared by Technical Committee
lSO/TC 61, Plastics, Subcommittee SC 2, Mechanical properties.
This third edition the second edition
cancels and replaces
(IS0 306:1987), which has been technically revised.
0 IS0 1994
All rights reserved. Unless otherwise specified, 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 permission 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 306:2000
IS0 306:1994(E)
INTERNATIONAL STANDARD 0 IS0
Plastics - Thermoplastic materials - Determination
of Vicat softening temperature (VST)
IS0 291:1977, Plastics - Standard atmospheres for
1 Scope
conditioning and testing.
IS0 293: 1986, Plastics - Compression moulding test
1.1
This International Standard specifies four meth-
specimens of thermoplastic materials.
ods for the determination of the Vicat softening tem-
perature (VST) of thermoplastic materials:
Injection moulding of test
IS0 294:-l), Plastics -
specimens of thermoplastic materials.
- Method A50 using a force of 10 N and a heating
rate of 50 ‘C/h
IS0 2818:--2), Plastics - Preparation of test speci-
mens by machining.
- Method B50 using a force of 50 N and a heating
rate of 50 ‘C/h
IS0 3167:1993, Plastics - Multipurpose test speci-
mens.
- Method Al20 using a force of 10 N and a heating
rate of 120 ‘C/h
3 Principle
- Method B120 using a force of 50 N and a heating
rate of 120 ‘C/h
Determination of the temperature at which a standard
indenter penetrates 1 mm into the surface of a plastic
test specimen under one of the loads given in 1 .l
1.2 The methods specified are applicable only to
when the temperature is raised at a uniform rate.
thermoplastics, for which they give a measure of the
temperature at which the thermoplastics start to sof-
The temperature at 1 mm penetration is quoted as
ten rapidly.
the VST in degrees Celsius.
4 Apparatus
2 Normative references
The apparatus consists essentially of:
The following standards contain provisions which,
through reference in this text, constitute provisions
of this International Standard. At the time of publi-
4.1 Rod, provided with a load-carrying plate (4.4),
cation, the editions indicated were valid. All standards
held in a rigid metal frame so that it can move freely
are subject to revision, and parties to agreements
in the vertical direction, the base of the frame serving
based on this International Standard are encouraged
to support the test specimen under the indenting tip
to investigate the possibility of applying the most re-
at the end of the rod (see figure 1).
cent editions of the standards indicated below.
Members of IEC and IS0 maintain registers of cur- Unless the rod and frame members have the same
rently valid International Standards. linear thermal expansion coefficient, the differential
I) To be published. (Revision of IS0 294:1975)
2) To be published. (Revision of IS0 2818:1980)

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SIST EN ISO 306:2000
Dial micrometer
mw
Interchangeable weight
Load-carrying plate --
Assembly of rod and indenting tip Ic
supporting the load-carrying plate
Approximate level of liquid
--
--
--
Indenting tip
Test specimen
Test-specimen support 1
Figure 1 - Example of apparatus with a heating bath for the determination of the VST
change in the length of these parts introduces an error
4.3 Calibrated micrometer dial gauge (or other
in the readings of the apparent deformation of the test
suitable measuring instrument), to measure to
specimen. A blank test shall be made on each appar-
& 0,Ol mm the penetration of the indenting tip into
atus using a test specimen made of rigid material the test specimen. The thrust of the dial gauge, which
having a low coefficient of expansion?) The tempera- contributes to the thrust on the test specimen, shall
ture ranges to be used shall be covered and a cor-
be recorded (see 4.4).
rection term determined for each temperature. If the
NOTES
correction term is 0,02 mm or greater, its algebraic
sign shall be noted and the term applied to each test
1 In certain types of apparatus, the force of the dial gauge
by adding it algebraically to the reading of apparent
spring is directed upwards and is subtracted from the load;
penetration. It is recommended that the apparatus be
in other forms, this force acts downwards and is added to
constructed of low thermal expansion alloy.
the load.
2 Since the force exerted by the spring in certain dial
gauges, varies considerably over the stroke, this force is
measured in that part of the stroke which is to be used.
4.2 Indenting tip, preferably of hardened steel,
3 mm long, of circular cross-section, and area
1,000 mm* & 0,015 mm*, fixed at the bottom of the
4.4 Load-carrying plate, fitted to the rod (4.11, and
rod (4.1). The lower surface of the indenting tip shall
suitable weights added centrally so that the total
be plane and perpendicular to the axis of the rod and thrust applied to the test specimen can be made up
free from burrs. to 10 N & 0,2 N for methods A50 and Al 20 and
3) lnvar and borosilicate glass have been found suitable for this purpose.

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SIST EN ISO 306:2000
@a IS0
IS0 306:1994(E)
50 N k 1 N for methods 850 and B120. The com- For an initial calibration, verify by experiment that the
bined downward thrust due to the rod, indenting tip, temperature indicated by the sensor is within & 1 “C
load-carrying plate and the force of the dial gauge
of the temperature that is indicated by an additional
spring shall not exceed 1 N.
sensor embedded within a blank test specimen.
NOTE 4 Commercially available ovens are often fur-
nished with means for suitable air or nitrogen circulation. If
not, the necessary heat-transfer rate may be ensured by
4.5 Hea
...