EN ISO 62:2008

SLOVENSKI STANDARD
01-januar-2009
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SIST EN ISO 62:2000
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Plastics - Determination of water absorption (ISO 62:2008)
Kunststoffe - Bestimmung der Wasseraufnahme (ISO 62:2008)
Plastiques - Détermination de l'absorption d'eau (ISO 62:2008)
Ta slovenski standard je istoveten z: EN ISO 62:2008
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 62
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2008
ICS 83.080.01 Supersedes EN ISO 62:1999
English Version
Plastics - Determination of water absorption (ISO 62:2008)
Plastiques - Détermination de l'absorption d'eau (ISO Kunststoffe - Bestimmung der Wasseraufnahme (ISO
62:2008) 62:2008)
This European Standard was approved by CEN on 28 January 2008.
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 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 Management Centre has the same status as the
official 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 STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 62:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3

Foreword
This document (EN ISO 62:2008) 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 August 2008, and conflicting national standards shall be withdrawn at
the latest by August 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 62:1999.
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 62:2008 has been approved by CEN as a EN ISO 62:2008 without any modification.

INTERNATIONAL ISO
STANDARD 62
Third edition
2008-02-15
Plastics — Determination of water
absorption
Plastiques — Détermination de l'absorption d'eau

Reference number
ISO 62:2008(E)
©
ISO 2008
ISO 62:2008(E)
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ii © ISO 2008 – All rights reserved

ISO 62:2008(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Principle. 2
4 Apparatus . 2
5 Test specimens . 2
5.1 General. 2
5.2 Square-shaped test specimens for homogeneous plastics. 3
5.3 Test specimens of reinforced plastics affected by anisotropic diffusion effects. 3
5.4 Tubular test specimens. 3
5.5 Rod-shaped test specimens . 4
5.6 Specimens cut from finished products, extrusion compounds, sheets or laminates . 4
6 Test conditions and procedures . 4
6.1 General. 4
6.2 General conditions . 4
6.3 Method 1: Determination of amount of water absorbed after immersion in water at 23 °C. 5
6.4 Method 2: Determination of amount of water absorbed after immersion in boiling water . 5
6.5 Method 3: Determination of water-soluble matter lost during immersion. 6
6.6 Method 4: Determination of amount of water absorbed after exposure to 50 % relative
humidity . 6
7 Expression of results . 6
7.1 Percentage by mass of water absorbed. 6
7.2 Determination of the water content at saturation and the water diffusion coefficient using
Fick’s laws. 7
8 Precision. 8
9 Test report . 9
Annex A (informative) Correlation between water absorption by test specimens and Fick’s
diffusion laws. 10
Annex B (informative) Precision statement. 12
Bibliography . 15

ISO 62:2008(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.
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 62 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 6, Ageing, chemical
and environmental resistance.
This third edition cancels and replaces the second edition (ISO 62:1999), to which a precision statement has
been added.
iv © ISO 2008 – All rights reserved

ISO 62:2008(E)
Introduction
Plastics exposed to water are subject to several different effects:
a) dimensional changes (e.g. swelling) caused by absorption of water;
b) extraction of water-soluble components;
c) changes in other properties.
However, exposure to humidity, immersion and exposure to boiling water can result in distinctly different
material responses. The equilibrium moisture content can be used to compare the amount of water absorbed
by different types of plastics when they are exposed to moisture. Moisture content determined under non-
equilibrium conditions can be used to compare different batches of the same material and to determine the
diffusion constant of the material when determined under carefully controlled non-equilibrium conditions of
exposure to moisture and when using plastic specimens of defined dimensions.

INTERNATIONAL STANDARD ISO 62:2008(E)

Plastics — Determination of water absorption
1 Scope
1.1 This International Standard describes a procedure for determining the moisture absorption properties in
the “through-the-thickness” direction of flat or curved-form solid plastics. This International Standard also
describes procedures for determining the amount of water absorbed by plastic specimens of defined
dimensions, when immersed in water or when subjected to humid air under controlled conditions. The
“through-the-thickness” moisture diffusion coefficient can be determined for single-phase material by
assuming Fickian diffusion behaviour with constant moisture absorption properties through the thickness of
the test specimen. This model is valid for homogeneous materials and for reinforced polymer-matrix
composites tested below their glass transition temperature. However, some two-phase matrices such as
hardened epoxies may require a multi-phase absorption model which is not covered by this International
Standard.
1.2 Ideally, the best comparison of the water absorption properties and/or diffusion coefficients of materials
should be carried out only using the equilibrium moisture content of plastics exposed to identical conditions.
The comparison of materials using properties at moisture equilibrium does not assume, and is therefore not
limited to, single-phase Fickian diffusion behaviour.
1.3 Alternatively, water absorption of plastic specimens of defined dimensions exposed to immersion or
humidity under controlled conditions but for an arbitrary time period can be used to compare differe
...