1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-23459-1 SANS 10183-4-2:2009Edition 1 EN 302-2:2004Edition 2SOUTH AFRICAN NATIONAL STANDARD Adhesives for wood Part 4-2: Test methods Deter
4、mination of resistance to delamination This national standard is the identical implementation of EN 302-2:2004 and is adopted with the permission of CEN, rue de Stassart 36, B-1050 Brussels. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 4
5、28 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 10183-4-2:2009 Edition 1 EN 302-1:2004 Edition 2 Table of changes Change No. Date Scope Acknowledgement The SABS Standards Division wishes to acknowledge the valuable assistance derived from publications of the European Committee for Standardizat
6、ion (CEN). National foreword This South African standard was approved by National Committee SABS SC 1010A, Adhesives for wood Adhesives for wood, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in Nov
7、ember 2009. This SANS document supersedes SANS 10183: 2000 (edition 1.1), in part. SANS 10183 consists of the following parts, under the general title Adhesives for wood: Part 1: Terminology and classification. Part 2: Structural applications. Part 3: Non-structural applications. Part 4: Test method
8、s. SANS 10183-4, in turn, consists of the following sections: Section 1: Determination of bond strength in longitudinal tensile shear strength. Section 2: Determination of resistance to delamination. Section 3: Determination of the effect of acid damage to wood fibres by temperature and humidity cyc
9、ling on the transverse tensile strength. Section 4: Determination of the effects of wood shrinkage on the shear strength. Section 5: Static load test of multiple bondline specimens in compression shear. Section 6: Determination of pH. Section 7: Resistance to creep under static loading for structura
10、l wood laminating adhesives used under exterior exposure conditions. EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 302-2July 2004ICS 83.180 Supersedes EN 302-2:1992English versionAdhesives for load-bearing timber structures - Test methods -Part 2: Determination of resistance to delaminationAdhsi
11、fs pour structures portantes en bois - Mthodesdessai - Partie 2: Dtermination de la rsistance audlaminageKlebstoffe fr tragende Holzbauteile - Prfverfahren - Teil 2:Bestimmung der DelaminierungsbestndigkeitThis European Standard was approved by CEN on 16 April 2004.CEN members are bound to comply wi
12、th 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 Secretaria
13、t 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 officialvers
14、ions.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, Switzerl
15、and 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 302-
16、2:2004: ESANS 10183-4-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 302-2:2004 (E) 2 Contents page Foreword3 1 Scope 4 2 Normative references 4 3 Principle4 4 Safety 4 5 Apparatus .4 6 Method 5 6.1 Selection of timber.5 6.2 Prepara
17、tion of the bonded members.5 6.3 Preparation of the test pieces 6 6.4 Test procedures.6 6.4.1 General6 6.4.2 High temperature procedure (for type I adhesives) .7 6.4.3 Low temperature procedure (for type II adhesives).7 6.5 Measurement and evaluation of delamination8 7 Expression of results 9 8 Test
18、 report 9 8.1 The adhesive 9 8.2 Preparation of the test pieces and testing procedures .9 8.3 Test results.10 Bibliography 11 SANS 10183-4-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 302-2:2004 (E) 3 Foreword This document (EN 30
19、2-2:2004) has been prepared by Technical Committee CEN/TC 193 “Adhesives”, the secretariat 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 January 2005, and conflicting
20、national standards shall be withdrawn at the latest by January 2005. This document supersedes EN 302-2:1992. This document is one of a series dealing with adhesives for use with timber structures, and is published in support of Eurocode No. 5 “Common unified rules for timber structures”. The series
21、consists of a classification and performance requirements for two types of phenolic and aminoplastic adhesives for use in different climatic conditions (EN 301), four test methods (EN 302 Parts 1 to 4) used to assess the performance of adhesives after specified heat and humidity treatments, and thre
22、e test methods (ENV 302-5 and EN 302 Parts 6 and 7) to characterise the working properties of the adhesive. EN 301 and EN 302 Parts 1 to 4 and Parts 6 and 7 have the following titles. EN 301 Adhesives, phenolic and aminoplastic, for load-bearing timber structures Classification and performance requi
23、rements EN 302 Adhesives for lead-bearing timber structures Test methods Part 1: Determination of bond strength in longitudinal tensile shear strength Part 2: Determination of resistance to delamination Part 3: Determination of the effect of acid damage to wood fibres by temperature and humidity cyc
24、ling on the transverse tensile strength Part 4: Determination of the effects of wood shrinkage on the shear strength Part 6: Determination of the conventional pressing time Part 7: Determination of the conventional working life ENV 302-5:2001 has the title Adhesives for load-bearing timber structure
25、s Test methods Part 5: Determination of the conventional assembly time. According to the 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, Finlan
26、d, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SANS 10183-4-2:2009This s tandard may only be used and printed by approved subscription and fr
27、eemailing clients of the SABS .EN 302-2:2004 (E) 4 1 Scope This part of EN 302 specifies a method for determining the resistance to delamination of bonded joints. It is suitable for the following applications: a) for assessing the compliance of adhesives with EN 301; b) for assessing the suitability
28、 and quality of adhesives for load-bearing timber structures; c) for comparing the effects on the bond strength resulting from the choice of bonding conditions, from different climatic conditioning and from the treatment of the test pieces before and after bonding. This test is intended primarily to
29、 obtain performance data for the classification of adhesives for load-bearing timber structures according to their suitability for use in defined climatic environments. This method is not intended for use to provide numerical design data and does not necessarily represent the performance of the bond
30、ed member in service. It is not intended to be used to assess the suitability of adhesives for the manufacture of wood-based panels. 2 Normative references Not applicable. 3 Principle Bonded, laminated specimens are subjected to an impregnation-drying procedure. The specimens are impregnated with wa
31、ter by immersing them and applying alternating high and low (vacuum) pressures. They are then dried rapidly at low humidity in a high velocity air stream. The extent of open glue lines, delamination, as a result of these treatments is measured and compared with the total length of glue lines on both
32、 end-grain faces of the specimen. 4 Safety Persons using this document shall be familiar with normal laboratory practice. This document does not purport to address all the safety problems, if any, associated with its use. It is the responsibility of the user to establish safety and health practices
33、and to ensure compliance with any European or national regulatory conditions. 5 Apparatus 5.1 Autoclave or similar pressure vessel, designed to safely withstand a pressure of at least 625 kPa absolute (525 kPa above nominal atmospheric pressure). 5.2 Vacuum pump or similar device, capable of reducin
34、g the pressure in the vessel (5.1) to below 20 kPa absolute (80 kPa below nominal atmospheric pressure). 5.3 Pump or similar device, for obtaining a pressure of at least 600 kPa absolute (500 kPa above nominal atmospheric pressure). SANS 10183-4-2:2009This s tandard may only be used and printed by a
35、pproved subscription and freemailing clients of the SABS .EN 302-2:2004 (E) 5 5.4 Air-circulating oven(s) or chamber(s), capable of maintaining: a) a temperature of (27,5 2,5) C and of circulating the air within the chamber at a velocity of (2,25 0,25) m/s and of maintaining a constant relative humi
36、dity of (30 5) %; and b) a temperature of (65 3) C and of circulating the air within the chamber at a velocity of (2,25 0,25) m/s, and of maintaining a relative humidity of (12,5 2,5) %. 5.5 Balance, allowing measurements with an accuracy of 1 g. 5.6 Metal wedge and wooden hammer, or similar devices
37、 capable of opening the glue lines. 6 Method 6.1 Selection of timber Make four laminated members out of plain-sawn, straight-grained spruce (Picea abies L.), free of reaction wood, with a density of (425 25) kg/m at 12 % moisture content. Preferably knot-free wood should be used, but allowances are
38、made for boards with knots up to a maximum of 20 mm in diameter, but splay (spike) knot is not allowed. Do not use radial-cut lamellae. If the adhesive is to be used on wood from hardwood species and/or on chemically treated wood, also prepare four laminated members using representative samples of t
39、hat wood. Condition the timber in the standard atmosphere (20 2) C and a relative humidity of (65 5) %) for at least seven days prior to bonding, ensuring that the timber has a moisture content of (12 1) %. 6.2 Preparation of the bonded members For each laminated member prepare at least six lamellae
40、 (150 5) mm wide, (30 1) mm thick and approximately 500 mm long. The desired thickness is achieved by planing 38 mm thick lamellae. Bond the lamellae in accordance with Table 1, within eight hours of planing. Within each assembly, ensure that the six lamellae present the same growth ring orientation
41、. SANS 10183-4-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 302-2:2004 (E) 6 Table 1 Preparation of the bonded members Parameters Members 1 and 2 Members 3 and 4 Adhesive spread (2 faces) As recommended bAs recommended bAir temper
42、ature (20 2) C (20 2) C Open assembly time 5 min 5 min Closed assembly time Minimum bMaximum bPressure (conifers) a(0,6 0,1) N/mm (0,6 0,1) N/mm Pressure time bAs recommended bAs recommended baFor hardwood species, the pressure shall be that recommended by the adhesive manufacturer. bAs recommended
43、by the adhesive manufacturer for a curing temperature of (20 2) C. After bonding and pressing, and before cutting and testing, condition the assembly for seven days in the standard atmosphere (20 2) C and a relative humidity of (65 5) %). NOTE A longer conditioning time may be used if recommended by
44、 the adhesive manufacturer. 6.3 Preparation of the test pieces From a full cross-section of each of the four laminated members to be tested, cut two test pieces using a sharp saw or other tool that produces a smooth surface. Remove sections 75 mm long by cutting perpendicularly to the surface of the
45、 assembly and not less than 50 mm from either end of the member. Record the time elapsed between the preparation of the test pieces and testing. 6.4 Test procedures 6.4.1 General Weigh and record the test pieces weight to the nearest gram. Place the test pieces in the pressure vessel and secure them
46、 to prevent them from floating. Add water at a temperature of (10 to 25) C to submerge completely the test pieces. Separate the test pieces by using at least 5 mm thick stickers, wire screens or other means in such a way that all end-grain surfaces are freely exposed to the water. Carry out either t
47、he high temperature procedure according to 6.4.2 for testing compliance with the requirements for type I adhesives for use in severe climatic conditions, or the low temperature procedure according to 6.4.3 for testing compliance with the requirements for type II adhesives for use in moderate climati
48、c conditions. SANS 10183-4-2:2009This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .EN 302-2:2004 (E) 7 6.4.2 High temperature procedure (for type I adhesives) Reduce the pressure in the vessel to (25 5) kPa absolute and maintain that pressure f
49、or 15 min. Release the vacuum and apply a pressure of (600 25) kPa absolute for one hour. With the test pieces still completely immersed, repeat this vacuum-pressure cycle once again to give a two-cycle impregnating period requiring a total of about 2 h 30 min. Dry the test pieces for 20 h in air let in at (65 3) C and a relative humidity of (10 to 15) % and circulating at a velocity of (2,25 0,25) m/s. During drying, place the test pieces at least 50 mm apart with the end-grain surfaces par
