1、BRITISH STANDARD BS EN 14292:2005 Adhesives Wood adhesives Determination of static load resistance with increasing temperature The European Standard EN 14292:2005 has the status of a British Standard ICS 83.180 BS EN 14292:2005 This British Standard was published under the authority of the Standards
2、 Policy and Strategy Committee on 1 July 2005 BSI 1 July 2005 ISBN 0 580 46276 5 National foreword This British Standard is the official English language version of EN 14292:2005. The UK participation in its preparation was entrusted to Technical Committee PRI/52, Adhesives, which has the responsibi
3、lity to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “Interna
4、tional Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a Brit
5、ish Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international an
6、d European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued s
7、ince publication Amd. No. Date CommentsEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14292 June 2005 ICS 83.180 English version Adhesives - Wood adhesives - Determination of static load resistance with increasing temperature Adhsifs - Adhsifs pour bois - Dtermination de la rsistance la charge
8、 statique sous augmentation de temprature Klebstoffe - Holzklebstoffe - Bestimmung der Bestndigkeit gegen statische Belastung in der Wrme This European Standard was approved by CEN on 24 March 2005. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditi
9、ons 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 of
10、ficial 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 standards bodies of Austria
11、, 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, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZAT
12、ION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14292:2005: EEN 14292:2005 (E) 2 Contents page Foreword3
13、1 Scope.4 2 Normative references.4 3 Terms and definitions 4 4 Safety.4 5 Principle 4 6 Apparatus4 7 Sample preparation 5 8 Test procedure5 9 Test report.6EN 14292:2005 (E) 3 Foreword This European Standard (EN 14292:2005) has been prepared by Technical Committee CEN/TC 193 “Adhesives”, the secretar
14、iat of which is held by AENOR. 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 December 2005, and conflicting national standards shall be withdrawn at the latest by December 2005. According to the
15、 CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembo
16、urg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 14292:2005 (E) 4 1 Scope This European Standard specifies a test method to determine the heat resistance of wood adhesives under static load and increasing temperature conditions.
17、 The test assesses the adhesives ability to resist sustained or continuous loading at temperatures well above normal room temperature, or in conditions where service temperatures are variable or cyclic. NOTE The procedure described is based on a test developed in Switzerland, known as the HRT92 test
18、. It uses test pieces described in EN 302-1 and EN 205, a static loading device and a means for increasing test pieces temperature at a specific rate. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edit
19、ion cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 205, Adhesives Wood adhesives for non-structural applications Determination of tensile shear strength of lap joints EN 302-1, Adhesives for load-bearing timber structures -
20、 Test methods - Part 1: Determination of bond strength in longitudinal tensile shear strength EN 923:1998, Adhesives Terms and definitions 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 923:1998 apply. 4 Safety Persons using this standard sh
21、all be familiar with the normal laboratory practice. This standard does not purport to address all the safety problems, if any, associated with its use. It is the responsibility of the user to establish health and safety practices and to ensure compliance with any European or national regulatory con
22、ditions. 5 Principle A lap joint between two wooden adherents is loaded in a climatically controlled environment by a constant leverage and strained to rupture under increasing temperature. 6 Apparatus 6.1 Oven, equipped with air circulation and a controlling device to increase the oven temperature
23、at a constant rate (50 2) C/h. NOTE To ensure a constant temperature gradient feed-back from the temperature sensor within the oven should be provided to the oven temperature control system. EN 14292:2005 (E) 5 6.2 Load device, as shown in Figure 1. 6.3 Weight, 2 kg, with means of attachment to the
24、lever arm. 6.4 Stopwatch, connected to a switch fixed at the load device. 7 Sample preparation 7.1 Preparation of test pieces Prepare nine test pieces as described in EN 302-1 or EN 205, but with modification as follows. In difference to the specification given in EN 302-1, the flat bottomed cuts ac
25、ross the grain shall be (5 0,5) mm. The test pieces used shall be cut to a length of 90 mm (see Figure 2). Where no manufacturers instructions are available, use the bonding procedure specified below. The surface to be bonded shall be situated exactly in the middle of the test pieces. Comply with th
26、e adhesive manufacturers instructions regarding the processing conditions, including the preparation of the adhesive, the amount of adhesive to be applied, whether the adhesive is to be applied on one or both surfaces, the open and closed assembly time and the magnitude and duration of the assembly
27、pressure and report them in the test report. 7.2 Conditioning bonded assemblies / test pieces After bonding and pressing, condition the bonded assemblies or test pieces for a minimum of seven days (close contact joints) to 14 days (gap joints) in a standard atmosphere of (20 2) C / (65 5) % relative
28、 humidity 20/65, or (23 2) C / (50 5) % relative humidity 23/50. 8 Test procedure Place the load device in the oven so that the distance of the test pieces from the rear wall of the oven is between minimum 80 mm and maximum 120 mm. Start the test at a temperature of between 23 C and 28 C. Raise the
29、lever arm and place the test piece on edge in the recess of the load device so that the lap joint is in the middle of the two supports (see Figure 1). Start the temperature control system when the lever arm is lowered to the lap joint. At the same time start the temperature recording system and the
30、stopwatch. The lever arm shall exert a force F of (214 2) N on the bonded area of 200 mm 2 , according to the geometry and weights of the relevant components of the load device (see Figure 1): 1 22 GA HA GB HB FL A D B =+ + where F is the force on the test piece in Newtons (N) EN 14292:2005 (E) 6 B
31、is the distance from the centre of rotation of the lever arm to the centre of rotation of the stamp in millimetres (mm) A is the distance from the centre of rotation of the lever arm to the centre of the load (mm) HA is the distance from the centre of rotation to the right end of the lever arm (mm)
32、HB is the distance from the centre of rotation to the left end of the lever arm (mm) L is the weight of the load (N) GA is the weight of the lever arm section HA (N) GB is the weight of the lever arm section HB (N) D is the weight of the stamp (N)“ The weight on the lever arm exerts a load of (214 2
33、) N on the bonded area of 200 mm 2 . During the test, increase the temperature by (50 2) C/ h. Terminate the test when the lever arm reaches a horizontal position due to rupture or extreme deformation of the adhesive bond so that the switch is activated. The final temperature can be copied directly
34、from the temperature-recording device or calculated by the duration of the test. The measured time (in minutes) is divided by the factor 1,2 (min/C) and added to the start temperature. 9 Test report 9.1 General The items listed in subclauses 9.2 to 9.4 shall be recorded in the test report. 9.2 The a
35、dhesive a) type and origin of the adhesive; b) batch number or other marking of uniquely identifying the adhesive used; c) number of components and working methods (procedure of preparing and applying of adhesive); d) durability class (for information only). 9.3 Preparation of the test pieces and te
36、sting procedures a) species of wood with botanical name; b) moisture content of wood relative to oven-dry mass; c) characteristic data relating to the bonding procedure (for instance information about the amount of glue applied, the open and closed assembly time, pressing pressure, pressing temperat
37、ure, pressing time); d) special treatment of the surface of the boards to be bonded; e) time between the termination of pressing and the cutting of the test pieces; EN 14292:2005 (E) 7 f) indication whether test pieces with a thin (0,1 mm) bond-line or with a thick (1 mm) bond-line have been used; g
38、) number of bonded test pieces; h) indication whether a climate of 20/65 or 23/50 has been used to condition the test pieces. 9.4 Test results a) number of test pieces; b) temperature at failure for each test piece, rounded to 1 C, i.e. minimum value, maximum value and mean value; c) standard deviat
39、ions in C; d) coefficient of variation, V, in %; e) date of test. NOTE The result of every single test piece should be reported. EN 14292:2005 (E) 8 All dimensions in millimetres Key 1 Load (2,00 0,02) kg 2 Test piece 3 Switch 4 Buffer Figure 1 Load device for determination of static load of wood ad
40、hesives to increasing temperature EN 14292:2005 (E) 9 All dimensions in millimetres Key l 1 = 90 1: total length of test piece; l 2 = 10,0 0,2: length of overlap (length of tested surface); b = 20,0 0,2: width of test piece (width of tested surface); s = 5,0 0,1: thickness of the panels: = 30 to 90:
41、 angle between growth ring and surface to be bonded; 1 Figure 2 Lap joint test pieces (thin glue line example) BS EN 14292:2005 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the
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