ASTM_D_1038_-_11.pdf

Designation:D103811Standard Terminology Relating toVeneer and Plywood1,2This standard is issued under the fixed designation D1038;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.INTRODUCTIONThe terms included in this terminology standard are intended to apply to a family of woodveneer-based panel products manufactured for use in construction and industrial applications.1.Scope1.1 This standard covers a repository of terms and classifi-cations essential needed for the business of SubcommitteeD07.03.1.2 The terms in this standard pertain to processing andcharacteristics of wood veneer and plywood products.2.Terminologyadhesivea substance capable of holding materials togetherby surface attachment.NOTE1adhesive is the general term and includes,among others,cement,glue,mucilage,and paste.All of these terms are loosely usedinterchangeably.Various descriptive adjectives are applied to the termadhesive to indicate certain characteristics as follows:(1)Physical form,that is,liquid adhesive,tape adhesive(2)Chemical type,that is,silicate adhesive,resin adhesive(3)Materials bonded,that is,paper adhesive,metal-plastic adhesive,canlabel adhesive(4)Conditions of use,that is,hot-setting adhesivebackthe side reverse to the face of a panel,or the poorer sideof a panel in any grade of plywood calling for a face andback.balanced constructionSee under construction.banding(railing)a portion of wood or other materialextending around one or more edges of a plywood panel.bleed throughadhesive or components of adhesive that haveseeped through the outer layer or ply of a bonded woodproduct and that show as a blemish or discoloration on thesurface.blemishanything marring the appearance of the veneer thatis not classifiable as a defect.blisterin plywood,an elevation of the surface of an adherend(separation between plies),somewhat resembling in shape ablister on the human skin;its boundaries may be indefinitelyoutlined and it may have burst or become flattened.bolt(veneer)a short log cut to length suitable for peeling ina lathe;also block.bond,nthe attachment at an interface between an adhesiveand an adherend.bond,vto attach materials together by means of an adhesive.borer holesvoids made by wood-boring insects.broken grain(shelling,leafing,grain separation)a sepa-ration on veneer surface between annual rings.cauls,nsheets of material employed singly or in pairs in hotor cold pressing of assemblies being bonded.Cauls areemployed usually to protect either the faces or the pressplaten or both against marring and staining,to preventsticking,to facilitate press loading,or to impart a desiredsurface texture or finish,and to provide uniform pressuredistribution.NOTE2Cauls may be made of any material such as aluminum,stainless steel,hardboard,fiberboard,or plastic,with the length and widthgenerally equal to the platen size of the press in which they are employed.centerinner layers whose grain direction runs parallel to thatof the outer plies;may be of parallel laminated plies.(Seealso core.)clipperthe shearing machine used to dimension dry or greenveneers to pregsynthetic resin-treated,compressed wood with re-duced swelling and shrinking characteristics and increaseddensity and strength properties.1This terminology is under the jurisdiction of ASTM Committee D07 on Woodand is the responsibility of Subcommittee D07.03 on Panel Products.Current edition approved Nov.1,2011.Published November 2011.Originallyapproved in 1949.Last previous edition approved in 2000 as D1038 83(2005).DOI:10.1520/D1038-11.2These definitions are specific to veneer and plywood.Other definitions relatingto timber appear in ASTM Terminology D9,Relating to Wood,Annual Book ofASTM Standards,Vol 04.10.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 constructiondetails of arrangement or thickness or both,ofveneers and other components used in the fabrication ofplywood.all-veneer constructionplywood in which all plies areveneer.Ordinarily no single ply of veneer will exceed516in.(7.9 mm)in thickness.balanced constructiona construction such that the forcesinduced by uniformly distributed changes in moisture contentwill not cause posite constructiona panel assembly consisting ofveneers and other wood-based materials.Normally the non-veneer component is identified in describing the construction.lumber core constructionplywood in which the centerply or core is of lumber rather than of veneer.Ordinarily coresthat are38in.(9.5 mm)or greater in thickness will be oflumber.symmetrical constructionplywood panels in which theplies on one side of the panel center line are essentially equalin thickness,grain direction,properties,and arrangement tothose on the other side of the center line.