Bsi bs en 00635 2 1995 (1999)

www bzfxw com BRITISH STANDARD BS EN 635 2 1995 Incorporating Amendment No 1 Plywood — Classification by surface appearance — Part 2 Hardwood The European Standard EN 635 2 1995 has the status of a Br[.]

BRITISH STANDARD BS EN

635-2:1995

Incorporating Amendment No 1

Plywood —

Classification by

surface appearance —

Part 2: Hardwood

The European Standard EN 635-2:1995 has the status of a

British Standard

ICS 79.060.10

BS EN 635-2:1995

This British Standard, having

been prepared under the

direction of the Sector Board for

Building and Civil Engineering,

was published under the

authority of the Standards Board

and comes into effect on

15 December 1995

© BSI 07-1999

The following BSI references

relate to the work on this

standard:

Committee reference B/541

Draft for comment 92/114811 DC

ISBN 0 580 24769 4

Committees responsible for this British Standard

The preparation of this British Standard was entrusted to Technical Committee B/541, Wood based panels, upon which the following bodies were represented:

APA/Engineered Wood Association Association of British Plywood and Veneer Manufacturers British Woodworking Federation

Council of the Forest Industries of British Columbia Department of the Environment (Building Research Establishment) Finnish Plywood International

Flat Roofing Contractors’ Advisory Board Forestry Commission

Furniture Industry Research Association Institution of Structural Engineers Local Authority Organizations Mineral Bonded Board Products Federation National Federation of Roofing Contractors National House-Building Council

National Panel Products Association Royal Institute of British Architects Structural Board Association Timber Research and Development Association Timber Trade Federation

Wood Panel Industries Federation Zurich Municipal Building Guarantee Co-opted members

Amendments issued since publication

Amd No Date Comments

9124 June 1996 Indicated by a sideline in the margin

BS EN 635-2:1995

Contents

Page Committees responsible Inside front cover

List of references Inside back cover

BS EN 635-2:1995

National foreword

This British Standard has been prepared by Technical Committee B/541 and is

the English language version of EN 635-2:1995 Plywood — Classification by

surface appearance — Part 2: Hardwood, published by the European Committee

for Standardization (CEN) EN 635-2 was produced as a result of international discussions in which the United Kingdom took an active part

BS EN 635-1, BS EN 635-2 and BS EN 635-3 together supersede BS 6566-6:1985, which will be withdrawn in accordance with CEN provisions within 6 months of completion of the full package of standards covering plywood and related test methods These standards are:

The method of classification used in BS EN 635-2 and BS EN 635-3 is similar to that of BS 6566-6:1985 But although the appearance classes in BS EN 635-2 and

BS EN 635-3 are identified as E, I, II, III and IV, these classes do not correspond exactly to the appearance classes E, I, II, III and IV of BS 6566-6 The BS EN 635 standards are thus not technically equivalent to BS 6566-6

NOTE EN 635-2 makes informative reference to EN 636-1, EN 636-2 and EN 636-3 which are currently in preparation.

A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application

Compliance with a British Standard does not of itself confer immunity from legal obligations.

EN 310

EN 313-1

EN 313-2

EN 314-1

EN 314-2

EN 315

EN 322

EN 323

EN 324-1

EN 324-2

EN 325

EN 635-1

EN 635-2

EN 635-3

EN 636-1

EN 636-2

EN 636-3

EN 1072

EN 1084

Cross-reference

Publication referred to Corresponding British Standard

EN 635-1:1994 BS EN 635 Plywood — Classification by surface

appearance

Part 1:1995 General

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 8, an inside back cover and a back cover

This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover

EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN 635-2

May 1995

ICS 79.060.10

Descriptors: Wood board, plywood, deciduous timber, classifications, appearance, defects

English version

Plywood — Classification by surface appearance —

Part 2: Hardwood

Contreplaqué — Classification selon l’aspect

des faces —

Partie 2: Bois feuillus

Sperrholz — Klassifizierung nach dem Aussehen der Oberfläche —

Teil 2: Laubholz

This European Standard was approved by CEN on 1995-04-14 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 Central Secretariat 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

Central Secretariat has the same status as the official versions

CEN members are the national bodies of Austria, Belgium, Denmark, Finland,

France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands,

Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom

CEN

European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung

Central Secretariat: rue de Stassart 36, B-1050 Brussels

© 1995 All rights of reproduction and communication in any form and by any means reserved in all

countries to CEN and its members

Ref No EN 635-2:1995 E

EN 635-2:1995

© BSI 07-1999

2

Foreword

This European Standard has been prepared by the

Technical Committee CEN/TC 112, Wood-based

panels, of which the secretariat is held by DIN

This standard is one of a series of standards for the

classification of plywood by surface appearance The

other Parts of this series are listed in clause 2 and

Annex A

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 1995, and conflicting national standards

shall be withdrawn at the latest by November 1995

According to the CEN/CENELEC Internal

Regulations, the following countries are bound to

implement this European Standard: Austria,

Belgium, Denmark, Finland, France, Germany,

Greece, Iceland, Ireland, Italy, Luxembourg,

Netherlands, Norway, Portugal, Spain, Sweden,

Switzerland and United Kingdom

Contents

Page

2 Normative references 3

3 Classification by surface appearance 3 3.1 Appearance classes 3 3.2 Permissible characteristics and defects 3 Annex A (informative) Bibliography 7 Table 1 — Classification according to

characteristics inherent in wood 4 Table 2 — Classification according to

EN 635-2:1995

1 Scope

This European Standard specifies the nature and

limits of characteristics inherent in wood and

manufacturing defects enabling the visual

assessment of the plywood for allocation to an

appearance class This classification is a

contribution to assessing the finishing suitability of

plywood

This Part of EN 635 applies to plywood, the surface

veneers of which are made from hardwood1) species

It does not apply to overlaid panels

2 Normative references

This European Standard incorporates by dated or

undated reference, provisions from other

publications These normative references are cited

at the appropriate places in the text and the

publications are listed hereafter For dated

references, subsequent amendments to or revisions

of any of these publications apply to this European

Standard only when incorporated in it by

amendment or revision For undated references the

latest edition of the publication referred to applies

EN 635-1, Plywood — Classification by surface

appearance — Part 1: General

3 Classification by surface appearance

3.1 Appearance classes

Assessment of characteristics and defects for determination of appearance class shall be carried out in accordance with EN 635-1 Surface

classification shall be based on the permissible characteristics and defects within each of the

appearance classes as specified in 3.2.

NOTE Guidance on selection of finishing for each appearance class is given in ENV 635-4.

3.2 Permissible characteristics and defects

Each surface shall be individually assigned to one of the appearance classes E, I, II, III, IV, as defined by the permissible characteristics and defects

indicated in Table 1 and Table 2

1) In English, this means conventionally broadleaved species.

3.2.1 Classification according to characteristics inherent in wood

Table 1 — Classification according to characteristics inherent in wood

3.2.1.1 Pin knotsa Practically

absent 3/m

2 permitted Permitted

3.2.1.2 Sound intergrown knots Permitted up to an individual diameter of:

15 mm provided their cumulative diameter does not exceed 30 mm/m2

35 mm 50 mm Permitted, but see note

Such knots may have splits provided they are very slight slight

3.2.1.3 Unsound or non-adhering

knots and knot holes Permitted up to an individual diameter of: Permitted, but see note

6 mm if filled and up to a number of 2/m2

5 mm if unrepaired,

25 mm if filled and up

to a number of 3/m2

40 mm

3.2.1.4 Splits Open Permitted if less than:

of panel length

up to an individual width of:

and up to a number of:

of panel width

if properly filled if unrepaired, or

unlimited if all filled

Table 1 — Classification according to characteristics inherent in wood

3.2.1.5 Abnormalities due to insects,

marine borers and parasitic plants Not permitted Not permitted Marks of parasitic plants not permitted Insects and marine borer holes permitted up to a: Permitted, but see note

diameter of 3 mm vertically to the plane

of the panel up

to 10/m2

width of 15 mm and a length of 60 mm up

to 3/m2

3.2.1.6 Inbark Not permitted Permitted up to a width of: Permitted, but

see note

5 mm if properly filled 25 mm

3.2.1.7 Irregularities in the

structure of the wood Practically absent Permittedif very slight if slight Permitted

3.2.1.8 Discoloration which is not

wood destroying Permitted if low contrast Permitted

3.2.1.9 Fungal decay, which is wood

destroying Not permitted Not permitted

3.2.1.10 Other characteristics Practically

absent To be considered under the category which they most closely resemble

NOTE Characteristics inherent to the wood are permitted provided that they do not impair the serviceability of the panel.

a Pin knots: sound intergrown knots of no more than 3 mm diameter.

3.2.2 Classification according to manufacturing defects

Table 2 — Classification according to manufacturing defects

3.2.2.1 Open joints Not permitted Not permitted Permitted up to a width of:

and up to a number of:

of panel width with joints filled if more than 1 mm in

3.2.2.2 Overlaps Not permitted Permitted up to a number

of 1/m2 and up to 100 mm length

Permitted up to a number of 2/m2 Permitted but see note

3.2.2.3 Blisters Not permitted

3.2.2.4 Hollows, imprints and bumps Not permitted Permitted if slight Permitted

3.2.2.5 Roughness Not permitted Permitted if slight Permitted

3.2.2.6 Sanding through Not permitted Permitted up to an extent of:

1 % 5 % (but see note)

of panel surface

3.2.2.7 Glue penetration Not permitted Permitted:

if slight and occasional up to an extent of 5 %

of the panel surface Permitted but see note

3.2.2.8 Foreign particles Not permitted Ferrous particles not permitted

3.2.2.9 Repairs:

a) patches;

b) shims;

c) synthetic fillers

Practically without defects Permitted if properly made and tightly filled up to a number of:3/m2 6/m2 unlimited Not permitted Not permitted Permitted within the limits specified in the

3.2.2.10 Defects at the edges of the

panel due to sanding or sawing Practically without defects Permitted up to:2 mm 5 mm Permitted but see note

from the edge

3.2.2.11 Other characteristics or defects To be considered under the category which they most closely resemble

NOTE Manufacturing defects are permitted provided that they do not impair the serviceability of the panel.

EN 635-2:1995

Annex A (informative)

Bibliography

EN 313-1, Plywood — Classification and terminology — Part 1: Classification.

EN 313-2, Plywood — Classification and terminology — Part 2: Terminology.

EN 635-1, Plywood — Classification by surface appearance — Part 1: General.

EN 635-2, Plywood — Classification by surface appearance — Part 2: Hardwood.

ENV 635-4, Guideline — Plywood — Classification by surface appearance — Part 4: Parameters of ability

for finishing2).

EN 636-1, Plywood — Specifications — Part 1: Requirements for plywood for use in dry conditions.

EN 636-2, Plywood — Specifications — Part 2: Requirements for plywood for use in humid conditions.

EN 636-3, Plywood Specifications — Part 3: Requirements for plywood for use in exterior conditions.

2) At present at the draft stage.

8 blank

BS EN 635-2:1995

© BSI 07-1999

List of references

See national foreword

BS EN

635-2:1995

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