Plastics - Thermoplastic materials - Determination of Vicat softening temperature (VST) (ISO 306:2013)

ISO 306:2013 specifies four methods for the determination of the Vicat softening temperature (VST) of thermoplastic materials:
method A50 using a force of 10 N and a heating rate of 50 K/h;
method B50 using a force of 50 N and a heating rate of 50 K/h;
method A120 using a force of 10 N and a heating rate of 120 K/h;
method B120 using a force of 50 N and a heating rate of 120 K/h.
The methods specified are applicable only to thermoplastics, for which they give a measure of the temperature at which the thermoplastics start to soften rapidly.

Kunststoffe - Thermoplaste - Bestimmung der Vicat-Erweichungstemperatur (VST) (ISO 306:2013)

Diese Internationale Norm legt vier Verfahren zur Bestimmung der Vicat-Erweichungstemperatur (VST) von Thermoplasten fest:
- Verfahren A50 mit einer Kraft von 10 N und einer Heizrate von 50 K/h;
- Verfahren B50 mit einer Kraft von 50 N und einer Heizrate von 50 K/h;
- Verfahren A120 mit einer Kraft von 10 N und einer Heizrate von 120 K/h;
- Verfahren B120 mit einer Kraft von 50 N und einer Heizrate von 120 K/h.
Die festgelegten Verfahren sind nur auf Thermoplaste anwendbar, für die sie eine Kennzahl der Temperatur liefern, bei der die Thermoplaste beginnen schnell zu erweichen.

Plastiques - Matières thermoplastiques - Détermination de la température de ramollissement Vicat (VST) (ISO 306:2013)

L'ISO 306:2013 spécifie quatre méthodes de détermination de la température de ramollissement Vicat (VST) des matières thermoplastiques:
méthode A50 utilisant une charge de 10 N et une vitesse d'échauffement de 50 K/h;
méthode B50 utilisant une charge de 50 N et une vitesse d'échauffement de 50 K/h;
méthode A120 utilisant une charge de 10 N et une vitesse d'échauffement de 120 K/h;
méthode B120 utilisant une charge de 50 N et une vitesse d'échauffement de 120 K/h.
Les méthodes spécifiées sont uniquement applicables aux thermoplastiques. Elles permettent de mesurer la température à laquelle le ramollissement de ces matières devient rapide.

Polimerni materiali - Plastomeri - Ugotavljanje temperature zmehčišča po Vicatu (VST) (ISO 306:2013)

Ta mednarodni standard določa štiri metode za ugotavljanje temperature zmehčišča polimernih materialov po Vicatu (VST): – metoda A50 z uporabo sile 10 N in hitrostjo segrevanja 50 °C/h, – metoda B50 z uporabo sile 50 N in hitrostjo segrevanja 50 °C/h, – metoda A120 z uporabo sile 10 N in hitrostjo segrevanja 120 °C/h, – metoda B120 z uporabo sile 50 N in hitrostjo segrevanja 120 °C/h. Opisane metode veljajo za polimerne materiale, za katere podajajo temperaturno meritev, pri kateri se plastomeri začnejo hitro mehčati.

General Information

Status
Published
Publication Date
19-Nov-2013
Technical Committee
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
20-Nov-2013
Completion Date
20-Nov-2013

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SLOVENSKI STANDARD
SIST EN ISO 306:2014
01-maj-2014
1DGRPHãþD
SIST EN ISO 306:2004
3ROLPHUQLPDWHULDOL3ODVWRPHUL8JRWDYOMDQMHWHPSHUDWXUH]PHKþLãþDSR9LFDWX
967  ,62

Plastics - Thermoplastic materials - Determination of Vicat softening temperature (VST)

(ISO 306:2013)

Kunststoffe - Thermoplaste - Bestimmung der Vicat-Erweichungstemperatur (VST) (ISO

306:2013)
Plastiques - Matières thermoplastiques - Détermination de la température de
ramollissement Vicat (VST) (ISO 306:2013)
Ta slovenski standard je istoveten z: EN ISO 306:2013
ICS:
83.080.20 Plastomeri Thermoplastic materials
SIST EN ISO 306:2014 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 306:2014
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SIST EN ISO 306:2014
EUROPEAN STANDARD
EN ISO 306
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2013
ICS 83.080.20 Supersedes EN ISO 306:2004
English Version
Plastics - Thermoplastic materials - Determination of Vicat
softening temperature (VST) (ISO 306:2013)

Plastiques - Matières thermoplastiques - Détermination de Kunststoffe - Thermoplaste - Bestimmung der Vicat-

la température de ramollissement Vicat (VST) (ISO Erweichungstemperatur (VST) (ISO 306:2013)

306:2013)
This European Standard was approved by CEN on 2 November 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
CEN-CENELEC 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 306:2013 E

worldwide for CEN national Members.
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SIST EN ISO 306:2014
EN ISO 306:2013 (E)
Contents Page

Foreword ..............................................................................................................................................................3

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SIST EN ISO 306:2014
EN ISO 306:2013 (E)
Foreword

This document (EN ISO 306:2013) 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 May 2014, and conflicting national standards shall be withdrawn at the

latest by May 2014.

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 306:2004.

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 306:2013 has been approved by CEN as EN ISO 306:2013 without any modification.

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SIST EN ISO 306:2014
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SIST EN ISO 306:2014
INTERNATIONAL ISO
STANDARD 306
Fifth edition
2013-11-15
Plastics — Thermoplastic materials
— Determination of Vicat softening
temperature (VST)
Plastiques — Matières thermoplastiques — Détermination de la
température de ramollissement Vicat (VST)
Reference number
ISO 306:2013(E)
ISO 2013
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SIST EN ISO 306:2014
ISO 306:2013(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 copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2013 – All rights reserved
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SIST EN ISO 306:2014
ISO 306:2013(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 2

5 Apparatus ..................................................................................................................................................................................................................... 2

6 Test frame assembly calibration .......................................................................................................................................................... 5

7 Test specimens........................................................................................................................................................................................................ 6

8 Conditioning .............................................................................................................................................................................................................. 6

9 Procedure..................................................................................................................................................................................................................... 6

10 Precision ....................................................................................................................................................................................................................... 7

11 Test report ................................................................................................................................................................................................................... 7

Annex A (informative) Comparison of VST results obtained with liquid-filled heating bath and

direct-contact heating unit ........................................................................................................................................................................ 9

Annex B (informative) Comparison of VST results obtained with liquid-filled heating bath and

fluidized bed ..........................................................................................................................................................................................................11

Annex C (informative) Repeatability and precision ..........................................................................................................................13

Bibliography .............................................................................................................................................................................................................................16

© ISO 2013 – All rights reserved iii
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SIST EN ISO 306:2014
ISO 306:2013(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.

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. 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. 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.

The committee responsible for this document is ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical properties.

This fifth edition cancels and replaces the fourth edition (ISO 306:2004), which has been technically

revised. The main changes are the following additions:
— new apparatus, namely heating equipment consisting of a fluidized bed;
— precision data based on round robin testing performed in 2009;
— comparison data for tests with liquid-filled and fluidized bed.
iv © ISO 2013 – All rights reserved
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SIST EN ISO 306:2014
ISO 306:2013(E)
Introduction

This revision introduces heating equipment, consisting of a fluidized bed, as a new apparatus; this is as

an alternative to liquid-filled heating baths and direct-contact heating units. Fluidized beds can reach

higher temperatures than traditional liquid-filled heating baths; therefore, they represent a suitable

way to measure the Vicat softening temperature (VST) of thermoplastic materials having improved

thermo-mechanical properties.
It was also felt necessary to add
— precision data based on round robin testing performed in 2009, and
— comparison data for tests with liquid-filled and fluidized bed.
© ISO 2013 – All rights reserved v
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SIST EN ISO 306:2014
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SIST EN ISO 306:2014
INTERNATIONAL STANDARD ISO 306:2013(E)
Plastics — Thermoplastic materials — Determination of
Vicat softening temperature (VST)
1 Scope

This International Standard specifies four methods for the determination of the Vicat softening

temperature (VST) of thermoplastic materials:
— method A50 using a force of 10 N and a heating rate of 50 K/h;
— method B50 using a force of 50 N and a heating rate of 50 K/h;
— method A120 using a force of 10 N and a heating rate of 120 K/h;
— method B120 using a force of 50 N and a heating rate of 120 K/h.

The methods specified are applicable only to thermoplastics, for which they give a measure of the

temperature at which the thermoplastics start to soften rapidly.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable to 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 291, Plastics — Standard atmospheres for conditioning and testing

ISO 293, Plastics — Compression moulding of test specimens of thermoplastic materials

ISO 294-1, Plastics — Injection moulding of test specimens of thermoplastic materials — Part 1: General

principles, and moulding of multipurpose and bar test specimens

ISO 294-2, Plastics — Injection moulding of test specimens of thermoplastic materials — Part 2: Small

tensile bars

ISO 294-3, Plastics — Injection moulding of test specimens of thermoplastic materials — Part 3: Small plates

ISO 472, Plastics — Vocabulary
ISO 2818, Plastics — Preparation of test specimens by machining
ISO 20753, Plastics — Test specimens
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 472 and the following apply.

3.1
penetration

distance over which the indenting tip has to penetrate into the specimen under test

Note 1 to entry: It is expressed in millimetres (mm).
© ISO 2013 – All rights reserved 1
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SIST EN ISO 306:2014
ISO 306:2013(E)
3.2
load
force applied to test specimen by means of the indenting tip
Note 1 to entry: It is expressed in Newtons (N).
3.3
Vicat softening temperature
VST

temperature at which a flat-ended needle penetrates the specimen to a depth of 1 mm under a specified

load using a selected uniform rate of temperature rise
Note 1 to entry: It is expressed in degrees Celsius (°C).
4 Principle

The temperature at which a standard indenting tip with a flat point penetrates 1 mm into the surface of

a plastic test specimen is determined. The indenting tip exerts a specified force perpendicular to the test

specimen, while the specimen is heated at a specified and uniform rate.

The temperature, in degrees Celsius, of the specimen, measured as close as possible to the indented area

at 1 mm penetration, is quoted as the VST.
5 Apparatus

5.1 Heating equipment, consisting of one of the following (5.1.1, 5.1.2 or 5.1.3) that will accept a

minimum of two test frame assemblies and a cooling device (5.1.4).

The heating equipment shall be provided with means of temperature control, enabling the temperature

to be raised at a uniform rate of (50 ± 5) K/h or (120 ± 10) K/h.
The heating rate shall be verified

— either by checking and recording automatically over the whole temperature range, or

— by manually checking and recording the temperature change at 6-min intervals over the temperature

range being verified.

The requirement for the heating rate shall be considered satisfied if, over every 6-min interval during

the test, the temperature change is (5 ± 0,5) °C or (12 ± 1) °C, respectively. For multiposition heating

equipment, the heating rate shall be verified at each test station. The apparatus may be designed to shut

off the heat automatically and sound an alarm when the specified indentation has been reached.

5.1.1 Liquid-filled heating bath, containing a liquid in which the test specimen can be immersed to a

depth of at least 35 mm. Liquid paraffin, transformer oil, glycerol and silicone oil are suitable liquid heat-

transfer media, but other liquids may be used. An efficient stirrer shall be provided. It shall be established

that the liquid chosen is stable at the temperature used and does not affect the material under test, for

example by swelling or cracking. Do not heat the liquid filled heating bath in excess of the flash point

specified by the heat transfer media manufacturer.

5.1.2 Direct-contact heating unit, containing heaters and blocks, which through conductive heating,

raise the temperature of the specimen at a controlled rate until the VST is reached.

5.1.3 Fluidized bed, containing a powder bed (e.g. aluminium oxide powder), in which the test specimen

can be immersed to a depth of at least 35 mm. This type of apparatus uses a micrometric aluminium oxide

powder, which when mixed with a suitable flow of heated air, creates a liquid-like heating medium. The

maximum working temperatures (and measurable VSTs) are therefore much higher than those attainable

2 © ISO 2013 – All rights reserved
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SIST EN ISO 306:2014
ISO 306:2013(E)

with liquids according to 5.1.1. An efficient stirring mechanism shall be provided, in order to achieve a

temperature homogeneity in the specimen area analogous to the case of a liquid-filled heating bath.

5.1.4 Cooling device, as an optional means to reduce the temperature of the heating device; it may be

used to reduce the time between tests.
5.2 Test frame assemblies (see Figures 1 and 2), consisting of the following.

5.2.1 Rod and frame, provided with a support plate or other suitable load-application device, held in a

rigid metal frame. The rod shall be able to move freely, with minimum friction, in a vertical direction. The

rod shall be designed to accept weights that will apply the test load. The base of the frame supports the

test specimen under the indenting tip at the end of the rod (see Figures 1 and 2). It is recommended that

the rod and the frame(s) be constructed of low thermal expansion material.

5.2.2 Indenting tip, preferably of hardened steel, 1,5 mm to 3 mm long, of circular cross-section and

of area (1,000 ± 0,015) mm (corresponding to an indenting-tip diameter of (1,128 ± 0,008) mm), fixed

at the bottom of the rod (5.2.1). The surface of the indenting tip in contact with the specimen shall be flat

and perpendicular to the axis of the rod, and free from burrs.

5.2.3 Weights, applied to the rod (5.2.1) centrally, so that the total load applied to the test specimen is

(10 ± 0,2) N for methods A50 and A120 and (50 ± 1) N for methods B50 and B120.
5.2.4 Penetration-measuring dev
...

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