BS 205:2016 pdf download – Adhesives — Wood adhesives for non-structural applications — Determination of tensile shear strength of lap joints This European Standard specifies tests for adhesives for wood and derived timber products for theassessment of their resistance to hot and cold water. It can be used for the assessment of the strength ofbonds with a thin bond-line. It does not apply to adhesives for structural use or to the manufacture ofparticleboards, fibreboards and plywood.It does not replace tests on finished products. 2Normative references The following documents, in whole or in part, are normatively referenced in this document and areindispensable for its application. For dated references,only the edition cited applies.For undatedreferences, the latest edition of the referenced document (including any amendments) applies. EN 204,Classification of thermoplastic wood adhesives for non-structural applications EN 923,Adhesives – Terms and definitions EN 12765,Classification of thermosetting wood adhesives for non-structural applications ISO 5893,Rubber and plastics test equipment —Tensile, flexural and compression types (constant rate oftraverse) -Specification ISO 6344-2:1998,Coated abrasives — Grain size analysis — Part 2: Determination of grain sizedistribution of macrogrits P12 to P220 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923 and the following apply.3.1 thin bond line close contact adhesive joint where the adhesive layer is nominally 0,1 mm thick4Principle A symmetrical bonded single lap joint between two symmetrical wooden adherends is subjected tospecified conditioning treatments and strained to rupture by a tensile force parallel to the grain. 5Apparatus The testing machine shall be a constant-rate-of-traverse machine as described in ISO 5893. If aconstant-rate-of-traverse machine is not available, a constant-rate-of-loading machine shall be usedcausing a rupture within the time limits specified in 6.5. The jaws shall grip the test pieces with a wedge action and permit self-alignment while the test piecesare being pulled. 6 Procedure 6.1 Preparation of bonded assemblies Prepare two panels (see Figure 1) from a thick unsteamed, conditioned, straight-grained board of beech(Fagus sylvatica L.) with a nominal density of (700 ± 50) kg/m3 with a moisture content of (12± 1)%. lt is permissible to prepare panels from different boards unless it is essential to minimize differences inthe wood in order to conduct special comparative tests. Ensure that the angle between the growth rings and the surface to be bonded is between 30° and 90°.Cut the panels across the direction of the grain to a length equal to a...
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