SIST EN 321:2026

SLOVENSKI STANDARD
01-maj-2026
Lesne plošče - Ugotavljanje odpornosti proti vlagi pri cikličnih pogojih
Wood-based panels - Determination of moisture resistance under cyclic test conditions
Holzwerkstoffe - Bestimmung der Feuchtebeständigkeit durch Zyklustest
Panneaux à base de bois - Détermination de la résistance à l'humidité selon essais
cycliques
Ta slovenski standard je istoveten z: EN 321:2026
ICS:
79.060.01 Lesne plošče na splošno Wood-based panels in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 321
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2026
EUROPÄISCHE NORM
ICS 79.060.01 Supersedes EN 321:2001
English Version
Wood-based panels - Determination of moisture resistance
under cyclic test conditions
Panneaux à base de bois - Détermination de la Holzwerkstoffe - Bestimmung der
résistance à l'humidité selon essais cycliques Feuchtebeständigkeit durch Zyklustest
This European Standard was approved by CEN on 26 January 2026.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 321:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 4
5 Apparatus . 4
5.1 Water bath . 4
5.2 Freezing cabinet . 4
5.3 Drying cabinet . 4
6 Test pieces . 5
6.1 Sampling . 5
6.2 Dimensions of test pieces . 5
6.3 Conditioning . 5
7 Procedure . 5
7.1 Treatment of the test pieces . 5
7.1.1 General. 5
7.1.2 Initial conditioning and measurement . 5
7.1.3 Cyclic treatment . 5
7.1.4 Reconditioning . 7
7.2 Determination of swelling in thickness . 7
7.3 Determination of tensile strength perpendicular to the plane of the board . 7
7.4 Determination of bending strength . 8
8 Expression of results . 8
8.1 Swelling in thickness . 8
8.2 Tensile strength . 8
8.3 Bending strength . 8
9 Test report . 8
Bibliography . 9

European foreword
This document (EN 321:2026) has been prepared by Technical Committee CEN/TC 112 “Wood-based
panels”, the secretariat of which is held by DIN.
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 September 2026, and conflicting national standards shall
be withdrawn at the latest by September 2026.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 321:2001.
— the wording of 7.2 has been changed to avoid misinterpretations;
— the Bibliography has been updated.
This document is one of a series specifying methods of test for determining the behaviour of wood-based
panels under the influence of moisture.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the United
Kingdom.
1 Scope
This document specifies a test method for the determination of the moisture resistance of wood-based
panels under cyclic test conditions.
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.
EN 310, Wood-based panels — Determination of modulus of elasticity in bending and of bending strength
EN 317, Particleboards and fibreboards — Determination of swelling in thickness after immersi
...