1、BRITISH STANDARDBS EN 975-2:2004Sawn timber Appearance grading of hardwoods Part 2: PoplarsThe European Standard EN 975-2:2004 has the status of a British StandardICS 79.040g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g5
2、1g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 975-2:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2006 BSI 2006ISBN 0 580 49106 4National forewordThis British Standard was published by BSI. It
3、is the UK implementation of EN 975-2:2004. The UK participation in its preparation was entrusted to Technical Committee B/543, Round and sawn timber.A list of organizations represented on B/543 can be obtained on request to its secretary.This publication does not purport to include all the necessary
4、 provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 975-2July 2004ICS 79.040English ver
5、sionSawn timber - Appearance grading of hardwoods - Part 2:PoplarsBois scis - Classement daspect des bois feuillus - Partie2: PeuplierSchnittholz - Sortierung nach dem Aussehen van Laubholz- Teil 2: PappelThis European Standard was approved by CEN on 1 April 2004.CEN members are bound to comply with
6、 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 Central Secretariat
7、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 Central Secretariat has the same status as the officialversio
8、ns.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerlan
9、d and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2004 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 975-2:
10、2004: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Rules for grading .5 4.1 General rules5 4.2 Determination of features .5 4.2.1 General5 4.2.2 Knots.5 4.2.3 Wane .5 5 Tables of rules for grading .6 Bibliography 8 EN 975-2:20043 Foreword This document (
11、EN 975-2:2004) has been prepared by Technical Committee CEN/TC 175 “Round and sawn timber”, the secretariat of which is held by AFNOR. 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 2005,
12、 and conflicting national standards shall be withdrawn at the latest by January 2005. This standard is one of a series of standards concerning appearance grading of non-structural timber. The other standards of this series are EN 975-1, Sawn timber - Appearance grading of hardwoods - Part 1: Oak and
13、 beech EN 1611-1, Sawn timber - Appearance grading of softwoods - Part 1: European spruces, firs, pines and Douglas firs According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium,
14、 Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 975-2:20044 1 Scope This standard defines
15、appearance grades for European poplars The standard applies to dry and green sawn timber, of thickness 15 mm up to 34 mm and of width 100 mm up to 250 mm measured in a green state. This standard does not apply to the strength grading of structural timber. 2 Normative references The following referen
16、ced 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. EN 844-1:1995, Round and sawn timber - Terminology - Part 1: General t
17、erms common to round timber and sawn timber EN 844-3:1995, Round and sawn timber - Terminology - Part 3: General terms relating to sawn timber EN 844-4:1997, Round and sawn timber - Terminology - Part 4: Terms relating to moisture content EN 844-6:1997, Round and sawn timber - Terminology - Part 6:
18、Terms relating to dimensions of sawn timber EN 844-7:1997, Round and sawn timber - Terminology - Part 7: Terms relating to anatomical structure of timber EN 844-9:1997, Round and sawn timber - Terminology - Part 9: Terms relating to features of sawn timber EN 844 10:1998, Round and sawn timber - Ter
19、minology - Part 10: Terms relating to stain and fungal attack EN 844-11:1998, Round and sawn timber - Terminology - Part 11: Terms relating to degrade by insects EN 844-12:2000, Round and sawn timber Terminology Part 12: Additional terms and general index EN 1310:1997, Round and sawn timber - Method
20、 of measurement of features ENV 12169, Criteria for the assessment of conformity of a lot of sawn timber 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 844-1:1995, EN 844-3:1995, EN 844-4:1997, EN 844-6:1997, EN 844-7:1997, EN 844-9:1997, EN
21、 844-10:1998, EN 844-11:1998 and EN 844-12:2000 apply. EN 975-2:20045 4 Rules for grading 4.1 General rules The grade of a piece of timber is based on the judgement of grade on each face/side separately. If all four sides are of the same grade, this is the grade of the piece. If one of the faces is
22、of a lower grade than any of the other three sides, the grade of the piece is one grade better than the grade of this worse face. If one of the edges has the lowest grade among the four sides, this lowest grade is the grade of the piece. This standard only defines the lower limit of each grade. Any
23、parcel of poplar supplied graded to these rules shall contain an even distribution of quality. The conformity of a batch of sawn timber shall be assessed according to ENV 12169, unless stated otherwise. 4.2 Determination of features 4.2.1 General Features are measured according to EN 1310. 4.2.2 Kno
24、ts Knots shall be assessed with regard to form, position and condition: Knots of 8 mm or less are not considered unless unsound / loose ; Round/oval knots on faces are to be measured in accordance with clause 4.1.1 of EN 1310:1997 including the compensation rule; Round/oval knots on edges are to be
25、measured in accordance with clause 4.1.2 of EN 1310:1997. NOTE 1 An intergrown knot may appear as a partially intergrown knot or a dead knot on the opposite face. NOTE 2 A partially intergrown knot may appear as an intergrown knot or a dead knot on the opposite face. NOTE 3 A dead knot may appear as
26、 an intergrown knot or a partially intergrown knot on the opposite face. 4.2.3 Wane Wane with bark is not permitted. EN 975-2:20046 5 Tables of rules for grading Table 1 Maximum accepted values for knots for European poplars (to be used in conjunction with clauses 1 to 4) Limits See NOTE Features Gr
27、ade 1 Grade 2 Grade 3 Grade 4 sound intergrown 0 15% of the width 30% of the width 60% of the width dead or partially intergrown 0 15% of the width 30% of the width 60% of the width encased (bark ringed) 0 10% of the width 20% of the width 30% of the width (1) Size Of Round/Oval Knots On Graded Face
28、 unsound or loose 0 0 30% of the width 60% of the width total number 0 3 4 Unlimited of which loose or unsound 0 0 2 Unlimited of which bark ringed 0 2 2 Unlimited Knot Number On Graded Face Per Worst Meter of which spike and splay 0 0 2 Unlimited sound intergrown 0 1/2 of the thickness 2/3 of the t
29、hickness Unlimited dead or partially intergrown 0 1/3 of the thickness 1/2 of the thickness Unlimited encased (bark ringed) 0 1/3 of the thickness 1/2 of the thickness 3/4 of thickness (1) Size Of Round/Oval Knots On Either Edge unsound or loose 0 1/4 of the thickness 1/3 of the thickness 1/2 of the
30、 thickness total number 0 3 4 Unlimited of which loose or unsound 0 0 2 Unlimited of which bark ringed 0 2 2 Unlimited (2) Knot Number On Graded Face Per Worst Meter On Either Edge of which spike and splay 0 0 2 Unlimited NOTE 1 Knots of 8 mm or less are not considered unless unsound/loose. NOTE 2 T
31、raversing knots allowed in a piece of grades 2 and 3. EN 975-2:20047 Table 2 Maximum accepted values of other features for European poplars (to be used in conjunction with clauses 1 to 4) Limits See NOTE Features Grade 1 Grade 2 Grade 3 Grade 4 Bark pocket Surface not permitted slight traces permitt
32、ed permitted Traversing on graded face not permitted not permitted not permitted not permitted Reaction wood not permitted permitted permitted permitted (1) Abnormal slope of grain on any side not permitted Not permitted permitted permitted Rot on any side not permitted not permitted not permitted n
33、ot permitted Discoloration on any side slight traces slight traces traces permitted Insect attack on any side not permitted not permitted not permitted permitted if not active width on face from each edge (mm) 0 0 10% of the width 20% of the width width on edge (mm) 0 0 1/2 of the thickness 1/2 of t
34、he thickness Wane length (% of each arris) 0 25 25 25 Pith presence Not permitted slight traces permitted permitted Fissures on the graded face Checks presence not permitted not permitted permitted permitted Face shakes % of length on the graded face 0 0 10% of the length of the piece (maximum 25cm)
35、 20% of the length of the piece (maximum 50cm) End shakes length on each end 3 cm 3 cm 5 cm 5 cm Warp Cup (% of width) 3 3 permitted permitted Bow (mm per 2 m) 10 permitted permitted permitted Spring (mm per 2 m) 4 4 permitted permitted Twist (% of width per 2 m) 8 8 10 20 NOTE 1 Abnormal slope of g
36、rain includes curly grain, top rupture and similar deviations. EN 975-2:20048 Bibliography EN 1311, Round and sawn timber - Method of measurement of biological degrade EN 975-2:2004blankBS EN 975-2:2004BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent natio
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