EN 204 pdf free download

EN 204 pdf free download.Classification of thermoplastic wood adhesives for non- structural applications.
2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 205:2016, Adhesives — Wood adhesives for non-structural applications — Determination of tensile shear strength of lap joints EN 923, Adhesives – Terms and definitions 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 923 and the following apply. 3.1 thermoplastic resin thermoplast polymer or copolymer capable of being softened by heating and hardened by cooling [SOURCE: EN 923:2015, modified — NOTE 1 to entry has been removed] 3.2 thermoplastic wood adhesive adhesive whose main constituent is a thermoplastic resin and which has been formulated for bonding wood 4 Classification An adhesive shall be classified in accordance with Table 1, which gives examples of climatic conditions and fields of application in which the bonded member is to be used. The classification shall be based on tests on thin bond-lines as defined in EN 205:2016. 5 Test method The adhesive shall be tested in accordance with EN 205:2016 and as follows: a) bond-lines shall be tested according to their assigned durability class (see Table 1); b) the tests shall be performed using the appropriate conditioning sequence given in Table 2; c) the individual strength values τ in N/mm 2 rounded to 0,1 N/mm 2 and the mean value of the 20 test pieces for each conditioning sequence shall be recorded. Results from tests in which failure occurred in the wood at values below the specified minimum are invalid. Test pieces that are twisted, bended or showing other irregularities in form are valid if they reach the requirements; otherwise, or if visual examination shows that the adhesive was not correctly applied, the results are invalid. All results, valid or invalid, shall be reported. Explanation of the invalid values shall be reported. The standard atmosphere used as a control climate is either (20 ± 2) °C and (65 ± 5) % relative humidity (RH), (20/65), or (23 ± 2) °C and (50 ± 5) % relative humidity (RH), (23/50). 6 Requirements When tested in accordance with EN 205:2016 the mean strength of an adhesive shall conform to the values shown in Table 2.EN 204  pdf download.