Dansk standard

DS/EN ISO 291

3. udgave

2008-05-27

Plast – Standardatmosfærer for

konditionering og prøvning

Plastics – Standard atmospheres for conditioning and testing

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DS-publikationstyper Dansk Standard udgiver forskellige publikationstyper. Typen på denne publikation fremgår af forsiden. Der kan være tale om: Dansk standard

• standard, der er udarbejdet på nationalt niveau, eller som er baseret på et andet lands nationale standard, eller • standard, der er udarbejdet på internationalt og/eller europæisk niveau, og som har fået status som dansk standard

DS-information • publikation, der er udarbejdet på nationalt niveau, og som ikke har opnået status som standard, eller • publikation, der er udarbejdet på internationalt og/eller europæisk niveau, og som ikke har fået status som standard, fx en

teknisk rapport, eller • europæisk præstandard DS-håndbog • samling af standarder, eventuelt suppleret med informativt materiale

DS-hæfte • publikation med informativt materiale

Til disse publikationstyper kan endvidere udgives

• tillæg og rettelsesblade DS-publikationsform Publikationstyperne udgives i forskellig form som henholdsvis

• fuldtekstpublikation (publikationen er trykt i sin helhed) • godkendelsesblad (publikationen leveres i kopi med et trykt DS-omslag) • elektronisk (publikationen leveres på et elektronisk medie)

DS-betegnelse Alle DS-publikationers betegnelse begynder med DS efterfulgt af et eller flere præfikser og et nr., fx DS 383, DS/EN 5414 osv. Hvis der efter nr. er angivet et A eller Cor, betyder det, enten at det er et tillæg eller et rettelsesblad til hovedstandarden, eller at det er indført i hovedstandarden. DS-betegnelse angives på forsiden. Overensstemmelse med anden publikation: Overensstemmelse kan enten være IDT, EQV, NEQ eller MOD

• IDT: Når publikationen er identisk med en given publikation. • EQV: Når publikationen teknisk er i overensstemmelse med en given publikation, men

præsentationen er ændret. • NEQ: Når publikationen teknisk eller præsentationsmæssigt ikke er i overensstemmelse med en

given standard, men udarbejdet på baggrund af denne. • MOD: Når publikationen er modificeret i forhold til en given publikation.

DS/EN ISO 291 København DS projekt: M227563 ICS: 83.080.01 Første del af denne publikations betegnelse er: DS/EN ISO, hvilket betyder, at det er en international standard, der har status både som europæisk og dansk standard. Denne publikations overensstemmelse er: IDT med: ISO 291:2008. IDT med: EN ISO 291:2008. DS-publikationen er på engelsk. Denne publikation erstatter: DS/EN ISO 291:2005.

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EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN ISO 291

May 2008

ICS 83.080.01 Supersedes EN ISO 291:2005

English Version

Plastics - Standard atmospheres for conditioning and testing(ISO 291:2008)

Plastiques - Atmosphères normales de conditionnement etd'essai (ISO 291:2008)

Kunststoffe - Normalklimate für Konditionierung undPrüfung (ISO 291:2008)

This European Standard was approved by CEN on 21 April 2008.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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 and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATIONC O M I T É E U R O P É E N D E N O R M A LI S A T I O NEUR OP ÄIS C HES KOM ITEE FÜR NOR M UNG

Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.

Ref. No. EN ISO 291:2008: E

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EN ISO 291:2008 (E)

2

Contents Page

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

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EN ISO 291:2008 (E)

3

Foreword

This document (EN ISO 291:2008) 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 November 2008, and conflicting national standards shall be withdrawn at the latest by November 2008.

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 291:2005.

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, 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 and the United Kingdom.

Endorsement notice

The text of ISO 291:2008 has been approved by CEN as a EN ISO 291:2008 without any modification.

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Reference numberISO 291:2008(E)

© ISO 2008

INTERNATIONAL STANDARD

ISO291

Fourth edition2008-05-01

Plastics — Standard atmospheres for conditioning and testing

Plastiques — Atmosphères normales de conditionnement et d'essai

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ISO 291:2008(E)

PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area.

Adobe is a trademark of Adobe Systems Incorporated.

Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

COPYRIGHT PROTECTED DOCUMENT © ISO 2008 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 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

ii © ISO 2008 – All rights reserved

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ISO 291:2008(E)

© ISO 2008 – All rights reserved iii

Contents Page

Foreword............................................................................................................................................................ iv 1 Scope ..................................................................................................................................................... 1 2 Normative references ........................................................................................................................... 1 3 Terms and definitions........................................................................................................................... 1 4 Principle................................................................................................................................................. 2 5 Standard atmosphere........................................................................................................................... 2 6 Classes of standard atmosphere ........................................................................................................ 2 7 Standard and ambient temperatures .................................................................................................. 3 8 Procedure .............................................................................................................................................. 3 Annex A (normative) Attainment of moisture equilibrium by plastics in a conditioning atmosphere...... 4 Annex B (informative) Background information ............................................................................................. 6 Bibliography ....................................................................................................................................................... 8

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ISO 291:2008(E)

iv © ISO 2008 – All rights reserved

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 291 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 6, Ageing, chemical and environmental resistance.

This fourth edition cancels and replaces the third edition (ISO 291:2005), of which it constitutes a minor revision. The main changes are as follows:

⎯ in Table 1, the way in which the two standard atmospheres are used is now described in terms of non-tropical and tropical countries;

⎯ a second note, concerning the unacceptability of wider tolerances on temperature and relative humidity, has been added at the end of Clause 6.

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INTERNATIONAL STANDARD ISO 291:2008(E)

© ISO 2008 – All rights reserved 1

Plastics — Standard atmospheres for conditioning and testing

1 Scope

This International Standard sets out specifications relating to the conditioning and testing of all plastics and all types of test specimen at constant atmospheric conditions.

Special atmospheres applicable to a particular test or material or simulating a particular climatic environment are not included in this International Standard.

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 62, Plastics — Determination of water absorption

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1 standard atmosphere preferred constant atmosphere for which specific air temperature and humidity values, as well as limit ranges for atmospheric pressure and air-circulation velocity, are specified, the air not having any significant additional constituents and the atmosphere not being subject to any significant additional radiation influences

NOTE 1 Standard atmospheres permit a defined state to be attained and maintained for samples or specimens.

NOTE 2 Standard atmospheres correspond to the average atmospheric conditions in laboratories and can be established in conditioning (controlled atmosphere) cabinets, chambers or rooms.

3.2 conditioning atmosphere constant atmosphere in which a sample or test specimen is kept before being subjected to a test

3.3 test atmosphere constant atmosphere to which a sample or test specimen is exposed throughout a test

3.4 conditioning one or more operations intended to bring a sample or test specimen into a state of equilibrium with regard to temperature and humidity

3.5 conditioning procedure combination of the conditioning atmosphere and the period of conditioning

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