Plywood — Classification by surface appearance — Part 1: General

This document establishes general rules for the classification of plywood by its surface appearance. It concerns plywood made of hardwood including tropical and temperate hardwood, softwood and plywood derived from other lignocellulosic materials. It does not apply to overlaid plywood.

Contreplaqué — Classification selon l'aspect des faces — Partie 1: Généralités

General Information

Publication Date
Technical Committee
Drafting Committee
Current Stage
6060 - International Standard published
Start Date
Due Date
Completion Date
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ISO 2426-1:2020 - Plywood -- Classification by surface appearance
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Standards Content (Sample)

Second edition
Plywood — Classification by surface
appearance —
Part 1:
Contreplaqué — Classification selon l'aspect des faces —
Partie 1: Généralités
Reference number
ISO 2426-1:2020(E)
ISO 2020

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ISO 2426-1:2020(E)

© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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ii © ISO 2020 – All rights reserved

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ISO 2426-1:2020(E)

Contents  Page
Foreword .iv
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 1
4  Classification by surface appearance . 1
4.1 Classes . 1
4.2 Characteristics and defects taken into consideration . 1
4.2.1 Determination of appearance class . 1
4.2.2 Characteristics inherent in wood . 1
4.2.3 Manufacturing defects . 2
4.3 Classification by appearance of panels . 3
5  Rules for classification . 3
5.1 Classification for hardwood and softwood . 3
5.2 Conditions of admissibility for inherent characteristics of wood, and
manufacturing defects . 3
5.2.1 General. 3
5.2.2 Joints . 4
5.2.3 Inclusions . 4
5.2.4 Repairs . 4
© ISO 2020 – All rights reserved iii

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ISO 2426-1:2020(E)

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
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
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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
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on the ISO list of patent declarations received (see www .iso .org/ patents).
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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 89, Wood-based panels, Subcommittee
SC 3, Plywood.
This second edition cancels and replaces the first edition (ISO 2426-1:2000), which has been technically
The main changes compared to the previous edition are as follows:
— In the scope it is precised that, this document concerns plywood made of hardwood including tropic

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