Dansk standard

DS/EN ISO 15512

2. udgave

2009-07-24

Plast – Bestemmelse af vandindhold

Plastics – Determination of water content

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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 15512 København DS projekt: M236339 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 15512:2008. IDT med: EN ISO 15512:2009. DS-publikationen er på engelsk. Denne publikation erstatter: DS/EN ISO 15512:2003.

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EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN ISO 15512

July 2009

ICS 83.080.01 Supersedes EN ISO 15512:2003

English Version

Plastics - Determination of water content (ISO 15512:2008)

Plastiques - Dosage de l'eau (ISO 15512:2008) Kunststoffe - Bestimmung des Wassergehaltes (ISO15512:2008)

This European Standard was approved by CEN on 20 June 2009.

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: Avenue Marnix 17, B-1000 Brussels

© 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.

Ref. No. EN ISO 15512:2009: E

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EN ISO 15512:2009 (E)

2

Contents Page

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

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EN ISO 15512:2009 (E)

3

Foreword

The text of ISO 15512:2008 has been prepared by Technical Committee ISO/TC 61 “Plastics” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 15512:2009 by 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 January 2010, and conflicting national standards shall be withdrawn at the latest by January 2010.

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 15512:2003.

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 15512:2008 has been approved by CEN as EN ISO 15512:2009 without any modification.

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Reference numberISO 15512:2008(E)

© ISO 2008

INTERNATIONAL STANDARD

ISO15512

Second edition2008-05-15

Plastics — Determination of water content

Plastiques — Dosage de l'eau

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ISO 15512:2008(E)

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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

Published in Switzerland

ii © ISO 2008 – All rights reserved

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ISO 15512:2008(E)

© ISO 2008 – All rights reserved iii

Contents Page

Foreword............................................................................................................................................................ iv Introduction ........................................................................................................................................................ v 1 Scope ..................................................................................................................................................... 1 2 Normative references ........................................................................................................................... 1 3 Method A — Extraction with anhydrous methanol ........................................................................... 2 3.1 Principle................................................................................................................................................. 2 3.2 Reagents................................................................................................................................................ 2 3.3 Apparatus .............................................................................................................................................. 2 3.4 Preparation of test sample................................................................................................................... 2 3.5 Procedure .............................................................................................................................................. 3 3.6 Expression of results ........................................................................................................................... 3 3.7 Precision................................................................................................................................................ 4 4 Method B — Water vaporization.......................................................................................................... 4 4.1 Principle................................................................................................................................................. 4 4.2 Reagents................................................................................................................................................ 4 4.3 Apparatus .............................................................................................................................................. 5 4.4 Preparation of sample .......................................................................................................................... 6 4.5 Procedure .............................................................................................................................................. 6 4.6 Expression of results ........................................................................................................................... 8 4.7 Precision................................................................................................................................................ 8 5 Method C — Manometric method........................................................................................................ 8 5.1 Principle................................................................................................................................................. 8 5.2 Reagent .................................................................................................................................................. 8 5.3 Apparatus .............................................................................................................................................. 9 5.4 Preparation of sample .......................................................................................................................... 9 5.5 Procedure ............................................................................................................................................ 11 5.6 Expression of results ......................................................................................................................... 13 5.7 Precision.............................................................................................................................................. 13 6 Test report ........................................................................................................................................... 13 Annex A (informative) Selection of the optimum heating temperature for the water content

determination ...................................................................................................................................... 14 Bibliography ..................................................................................................................................................... 16

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ISO 15512:2008(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 15512 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-chemical properties.

This second edition cancels and replaces the first edition (ISO 15512:1999), which has been technically revised.

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ISO 15512:2008(E)

© ISO 2008 – All rights reserved v

Introduction

The inter-laboratory comparability of water content determinations is often low. Major causes for this are the sample packaging, sample handling and differences between equipment and settings. In order to be able to compare data between two laboratories, special care needs to be taken with sample packaging and sample handling. Samples should e.g. be packed in special glass containers or water barrier sealed bags. Sample handling should preferably be carried out in a dry nitrogen or air environment. To improve the repeatability and reproducibility, the procedure specified in this International Standard should be followed strictly.

The temperature settings for the vaporization method described in this International Standard are not specified in the standard. For the manometric method, a temperature of 200 °C is often used. However, for some condensation materials this might be too high and could e.g. cause generation of water due to a condensation reaction.

The heating temperature should be optimized concerning the material to be tested, the equipment in use and the practical circumstances. If the temperature is too low, the total amount of water in the material to be tested will not be evaporated completely, whereas too high temperatures cause water generation due to effects like degradation and condensation reactions.

In this International Standard, a procedure is included for optimization of the heating temperature in order to choose the correct temperature for the water content determination and to improve the inter-laboratory comparability.

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INTERNATIONAL STANDARD ISO 15512:2008(E)

© ISO 2008 – All rights reserved 1

Plastics — Determination of water content

1 Scope

1.1 This International Standard specifies methods for the determination of the water content of plastics in the form of granules and finished articles. These methods do not test for water absorption (kinetics and equilibrium) of plastics as measured by ISO 62. The methods are suitable for the determination of water content as low as the following levels:

⎯ Method A 0,1 % or better;

⎯ Method B 0,01 % or better;

⎯ Method C 0,01 % or better.

Water content is an important parameter for processing materials, and should remain below the level specified in the appropriate material standard.

1.2 Three alternative methods are specified in this International Standard:

a) Method A is an extraction method using anhydrous methanol followed by a Karl Fischer titration of the extracted water. It can be used for all plastics and is applicable to granules having a maximum size of 4 mm × 4 mm × 3 mm.

b) Method B is a vaporization method using heated, dry air or nitrogen gas to evaporate the water, followed by a Karl Fischer titration of the collected water. It can be used for all plastics and is applicable to granules smaller than 4 mm × 4 mm × 3 mm.

c) Method C is a manometric method. The water content is determined from the increase in pressure which results when the water is evaporated under a vacuum. This method is not applicable to plastic samples containing volatile compounds, other than water, in amounts contributing significantly to the vapour pressure at room temperature. Checks for the presence of large amounts of volatile compounds should be carried out periodically, for example by gas chromatography. Such checks are particularly required for new types or grades of material.

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 760, Determination of water — Karl Fischer method (General method) CO

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