prEN ISO 293

Plastics - Compression moulding of test specimens of thermoplastic materials (ISO/DIS 293:2022)

ISO 293:2004 specifies the general principles and the procedures to be followed with thermoplastics in the preparation of compression-moulded test specimens, and sheets from which test specimens may be machined or stamped.

Kunststoffe – Formgepresste Probekörper aus Thermoplasten (ISO/DIS 293:2022)

Plastiques - Moulage par compression des éprouvettes en matières thermoplastiques (ISO/DIS 293:2022)

L'ISO 293:2004 spécifie les principes généraux et les modes opératoires à suivre, dans le cas de matières thermoplastiques, pour la préparation d'éprouvettes moulées par compression et de plaques nécessaires pour l'usinage ou la découpe d'éprouvettes.

Polimerni materiali - Preskušanci plastomerov, oblikovani s stiskanjem (ISO/DIS 293:2022)

General Information

• Status: Not Published
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: CEN/TC 249 - Plastics
• Ref Project: oSIST prEN ISO 293:2022 - Plastics - Compression moulding of test specimens of thermoplastic materials (ISO/DIS 293:2022)

RELATIONS

• Revised: EN ISO 293:2005 - Plastics - Compression moulding of test specimens of thermoplastic materials (ISO 293:2004)
• Effective Date: 06-Oct-2021

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN ISO 293:2022
01-september-2022
Polimerni materiali - Preskušanci plastomerov, oblikovani s stiskanjem (ISO/DIS
293:2022)

Plastics - Compression moulding of test specimens of thermoplastic materials (ISO/DIS

293:2022)
Kunststoffe – Formgepresste Probekörper aus Thermoplasten (ISO/DIS 293:2022)

Plastiques - Moulage par compression des éprouvettes en matières thermoplastiques

(ISO/DIS 293:2022)
Ta slovenski standard je istoveten z: prEN ISO 293
ICS:
83.080.20 Plastomeri Thermoplastic materials
oSIST prEN ISO 293:2022 en,fr,de

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

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oSIST prEN ISO 293:2022
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oSIST prEN ISO 293:2022
DRAFT INTERNATIONAL STANDARD
ISO/DIS 293
ISO/TC 61/SC 9 Secretariat: KATS
Voting begins on: Voting terminates on:
2022-06-29 2022-09-21
Plastics — Compression moulding of test specimens of
thermoplastic materials

Plastiques — Moulage par compression des éprouvettes en matières thermoplastiques

ICS: 83.080.20
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
ISO/CEN PARALLEL PROCESSING
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
Reference number
NATIONAL REGULATIONS.
ISO/DIS 293:2022(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 2022
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oSIST prEN ISO 293:2022
ISO/DIS 293:2022(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 293
ISO/TC 61/SC 9 Secretariat: KATS
Voting begins on: Voting terminates on:
Plastics — Compression moulding of test specimens of
thermoplastic materials

Plastiques — Moulage par compression des éprouvettes en matières thermoplastiques

ICS: 83.080.20
This document is circulated as received from the committee secretariat.
COPYRIGHT PROTECTED DOCUMENT
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
© ISO 2022
ISO/CEN PARALLEL PROCESSING
THEREFORE SUBJECT TO CHANGE AND MAY

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

NOT BE REFERRED TO AS AN INTERNATIONAL

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IN ADDITION TO THEIR EVALUATION AS

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CP 401 • Ch. de Blandonnet 8
STANDARDS MAY ON OCCASION HAVE TO
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CH-1214 Vernier, Geneva
POTENTIAL TO BECOME STANDARDS TO
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WHICH REFERENCE MAY BE MADE IN
Reference number
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NATIONAL REGULATIONS.
Website: www.iso.org ISO/DIS 293:2022(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
Published in Switzerland
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
© ISO 2022 – All rights reserved
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2022
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oSIST prEN ISO 293:2022
ISO/DIS 293:2022(E)
Contents Page

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

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

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

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

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

4 Apparatus .................................................................................................................................................................................................................... 2

4.1 Moulding press ....................................................................................................................................................................................... 2

4.2 Moulds ............................................................................................................................................................................................................ 3

4.2.1 General ........................................................................................................................................................................................ 3

4.2.2 Fabrication ............................................................................................................................................................................... 3

4.2.3 Types ............................................................................................................................................................................................. 4

5 Procedure ....................................................................................................................................................................................................................5

5.1 Preparation of moulding material......................................................................................................................................... 5

5.1.1 Drying of granular material ..................................................................................................................................... 5

5.1.2 Preparation of preforms .............................................................................................................................................. 5

5.2 Moulding ...................................................................................................................................................................................................... 5

5.3 Cooling ........................................................................................................................................................................................................... 5

5.3.1 General ........................................................................................................................................................................................ 5

5.3.2 Cooling methods ................................................................................................................................................................. 5

6 Inspection of the moulded specimens or sheets ................................................................................................................ 6

7 Specimen preparation report ................................................................................................................................................................6

iii
© ISO 2022 – All rights reserved
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oSIST prEN ISO 293:2022
ISO/DIS 293:2022(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 9,

Thermoplastic materials, 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 forth edition of ISO 293 cancels and replaces the third edition (ISO 293:2004), which has been

technically revised.
The main changes compared to the previous edition are as follows:
— ISO 20753 has been added in normative references (see Clause 2);
— ISO 21920-2 has been revised in normative references (see Clause 2);
— “Cooling rate” has been revised in terms and definitions (see Clause 3);

— The biggest clamping force and the highest platens temperature has been revised (see 4.1);

— The description of common specifications of positive mould has been given (see 4.2.3.3);

— The conditions for the use of vacuum oven while material drying has been given (see 5.1.1);

— The methods of cooling rate have been revised (see Table 1).

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.
© ISO 2022 – All rights reserved
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oSIST prEN ISO 293:2022
ISO/DIS 293:2022(E)
Introduction

For reproducible test results, specimens with a defined state are required. In contrast to injection

moulding, the aim of compression moulding is to produce test specimens and sheets for machining or

stamping of test specimens that are homogeneous and isotropic.

In the process of compression moulding, mixing of material takes place on a negligible scale. Granules

and powders fuse only at their surfaces and preforms (milled sheets) are only partially softened.

Isotropic and homogeneous specimens can, therefore, only be obtained when the moulding material

is itself homogeneous and isotropic. This has to be considered when processing multiphase materials,

such as ABS, which retain their internal structure.

The cooling rate in the crystallization stage has a great influence on the properties of semi-crystalline

or crystalline polymer (such as PB, PE, PP, etc.), so it is necessary to control the cooling rate more

strictly at the cooling stage.
© ISO 2022 – All rights reserved
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oSIST prEN ISO 293:2022
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oSIST prEN ISO 293:2022
DRAFT INTERNATIONAL STANDARD ISO/DIS 293:2022(E)
Plastics — Compression moulding of test specimens of
thermoplastic materials
1 Scope

This document specifies the general principles and the procedures to be followed with thermoplastics

in the preparation of compression-moulded test specimens, and sheets from which test specimens may

be machined or stamped.

In order to obtain mouldings in a reproducible state, the main steps of the procedure, including four

different cooling methods, are standardized. For each material, the required moulding temperature

and cooling methods are as specified in the appropriate International Standard for the material or as

agreed between the interested parties.
This document is not recommended for reinforced thermoplastics.
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 286-1, Geometrical product specifications (GPS) — ISO code system for tolerances on linear sizes —

Part 1: Basis of tolerances, deviations and fits
ISO 20753, Plastics — Test specimens

ISO 21920-2, Geometrical product specifications (GPS) — Surface texture: Profile — Part 2: Terms,

definitions and surface texture parameters
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO an
...