BS 1203-2001 Hot-setting phenolic and aminoplastic wood adhesives - Classification and test method《热固酚醛和氨基塑料木材胶粘剂 分类和试验方法》.pdf

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1、BRITISH STANDARD BS 1203:2001 Hot-setting phenolic and aminoplastic wood adhesives Classification and test methods ICS: 83.180 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS 1203:2001 This British Standard, having been prepared under the direction of the Materials and Chemi

2、cals, was published under the authority of the Standards Policy and Strategy Committee on 15 November 2001 BSI 11-2001 The following BSI references relate to the work on this British Standard Committee reference PRI/521 Draft for comment 78/52085 DC ISBN 0 580 38641 4 Committees responsible for this

3、 British Standard The preparation of this British Standard was entrusted to PRI/52, Adhesives, upon which the following bodies were represented: Consumer Policy Committee of BSI Contract Flooring Association European Resin Manufacturers Association SATRA UK Steel Association University of Bristol Na

4、tional Physical Laboratory DETR represented by BRE TRADA BASA TWI British Woodworking Federation The Tile Association Amendments issued since publication Amd. No. Date CommentBS 1203:2001 BSI 15 November 2001 i Contents Committees responsible Inside front cover Foreword ii 1S c o p e 1 2 Normative r

5、eferences 1 3T e r m s a n d d e f i n i t i o n s 1 4 Categories of adhesive 1 5 Requirements 1 5.1 Requirements for an adhesives resistance to moisture and attack by micro-organisms 1 5.2 Shelf-life of components 2 6 Test methods 2 6.1 Method of preparing test pieces 2 6.2 Treatment for testing re

6、sistance to cold water 3 6.3 Treatment for testing resistance to hot water 4 6.4 Treatment for testing resistance to boiling water 4 6.5 Treatment for testing resistance to micro-organisms 4 6.6 Method of determining the failing force 4 6.7 Expression of results 5 6.8 Test report 5 Figure 1 Test pie

7、ce 3 Table 1 Requirements for adhesives in moisture resistance tests 2BS 1203:2001 ii BSI 15 November 2001 Foreword This British Standard has been prepared under the direction of the Adhesives Standards Policy Committee. The standard is based on the British Standard BS 1203:1979 (amended by AMD 6284

8、:1990), Synthetic resin adhesives (phenolic and aminoplastic) for plywood, which is now withdrawn. However, the scope has been extended to cover hot setting wood adhesives for any application involving thin glue-lines, and the designation of the durability classes has been changed. Data on the durab

9、ility of joints under various natural conditions of exposure have been obtained over a number of years and results of these long-term trials have been linked with the performance of standard test pieces following immersion in cold, hot or boiling water. These wet tests are used in this standard to d

10、ifferentiate between various types of a phenolic and aminoplastic resins. Resins of other chemical formulations that comply with the test requirements would not necessarily attain equal durability in service, and their performance should be confirmed by field trials. The four durability classes spec

11、ified in this standard provide a scale of durability ranging from adhesives suitable for interior use (H1) to full exterior use (H4). However, it is important to appreciate that bond-line durability depends not only on the type of adhesive, but also on the correct application of pressure and tempera

12、ture for the appropriate time. The standard timber, European beech (Fagus sylvatica), although not commonly used for many structural applications, is eminently suitable for discriminatory testing work. A British Standard does not purport to include all necessary provisions of a contract. Users of Br

13、itish Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations Summary of pages This document comprises a front cover, an inside front cover, pages i to ii, pages 1 to 5 and a back cover. The BSI copyright n

14、otice displayed in this document indicates when the document was last issued.BS 1203:2001 BSI 15 November 2001 1 1 Scope This British Standard specifies the technical requirements and methods of test for adhesives based on synthetic resins of the phenolic and aminoplastic types, with or without addi

15、tional hardeners and extenders. The standard does not in any way apply to adhesives based on resins of types other than phenolic or aminoplastic and should not be quoted for these other materials. The properties of the adhesives are determined by tests made on beechwood joints with thin gluelines. T

16、he failing forces obtained on the test pieces prescribed cannot be converted into terms of stress values (i.e. pascals) for structural calculations. Resins sometimes require a hardener to be added by the user. In this situation, this standard covers the combination of resin and hardener. If the resi

17、n and hardener are sold separately, neither by itself can be said to conform to any of the specified durability classes. 2 Normative references This standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places

18、 in the text and the publications are listed hereafter. For undated references, the latest edition of the publication referred to applies. BS EN 923, Adhesives Terms and definitions. BS 5214-1, Rubber and plastics test equipment Part 1: Tensile flexural and compression types. ISO 5893 BS EN 350-1, D

19、urability of wood and wood-based products Natural durability of solid wood Part 1: Guide to the principles of testing and classification of the natural durability of wood. BS EN 635-2, Plywood Classification by surface appearance Part 2: Hardwood. 3 Terms and definitions For the purposes of this sta

20、ndard, the terms and definitions given in BS EN 923 apply. 4 Categories of adhesive Requirements are specified for four durability classes of adhesive, the designation and characteristics of each being as follows. For the purpose of this specification, the four durability classes are distinguished b

21、y their performance in the wet tests described in clause 6 of this standard. 5 Requirements 5.1 Requirements for an adhesives resistance to moisture and attack by micro-organisms Tests for moisture resistance are given in 6.2, 6.3 and 6.4. The test for micro-organism resistance is given in 6.5. Perf

22、ormance in these tests is measured by the mean failing force of 10 lap joints. Details of the lap joints are given in 6.1. The mean failing forces following the various water treatments and micro-organism test for each class of adhesive described in clause 4 are given in Table 1. H1 Joints made with

23、 these adhesives are resistant to cold water but are not required to withstand attack by micro-organisms. Such adhesives are typically used for interior applications. H2 Joints made with these adhesives will survive full exposure to weather for only a few years. They will withstand cold water for a

24、long period and hot water for a limited time, but fail under the test for resistance to boiling water. They are resistant to attack by micro-organisms. H3 Joints made with these adhesives have good resistance to weather and to the test for resistance to boiling water, but fail under the very prolong

25、ed exposure to weather that type H4 adhesives will withstand. The joints will withstand cold water for many years and are highly resistant to attack by micro-organisms. H4 Adhesives which, by systematic tests and by their records in service over many years, have been proved to make joints highly res

26、istant to weather, micro-organisms, cold and boiling water, steam and dry heat.BS 1203:2001 2 BSI 15 November 2001 Table 1 Requirements for adhesives in moisture resistance tests 5.2 Shelf-life of components The adhesive shall comply with the appropriate requirements of Table 1 after its components

27、have been stored for the maximum time specified by the manufacturer under the storage conditions agreed between the manufacturer and the user. 6 Test methods 6.1 Method of preparing test pieces 6.1.1 Veneers Prepare the test pieces from veneers constructed of veneers of European beech according to t

28、he following specification. The veneers shall have the growth rings approximately parallel to the face. They shall be (1.5 0.10) mm thick and they shall be at least 325 mm 325 mm in size (see 6.1.5). In quality, the veneers shall be without joints and shall comply with the requirements for Grade 1 v

29、eneers given in BS EN 635-2. Unless otherwise recommended by the adhesive manufacturer, the moisture content of the veneers shall be (10 2.5) %, as determined by the method given in 6.1.3. NOTE This corresponds with that attained during storage in a normally heated room. Moisture contents outside of

30、 this range shall be reported in the test report. 6.1.2 Adhesive The manufacturer shall provide instructions detailing the manner in which each adhesive shall be used with beech. 6.1.3 Method for the determination of moisture content of veneers 6.1.3.1 Apparatus 6.1.3.1.1 Oven, capable of being cont

31、rolled at 100 C to 105 C. 6.1.3.1.2 Balance, capable of measuring the mass of a veneer to the nearest 0.001 g. 6.1.3.2 Procedure Take a representative sample of the veneers and weigh each to the nearest 0.001 g. Dry the veneers in the oven at a temperature of 100 C to 105 C until their mass is const

32、ant. Calculate the percentage of moisture using the formula: Percentage of moisture = Durability class Test Boiling water resistance 6 h boil (See 6.2) Hotwater resistance 3 h at 67 C (See 6.3) Cold water resistance 16 to 24 h at 15 C (See 6.4) Micro-organism resistance (See 6.5) Minimum mean failin

33、g force Minimum mean failing force Minimum mean failing force Minimum mean failing force kN kN kN kN H1 Not applicable Not applicable 1.10 Not applicable H2 Not applicable 0.90 1.10 1.10 H3 0.45 Not applicable 1.10 1.10 H4 0.90 Not applicable 1.10 1.10 M 1 M 0 M 0 - - 100 BS 1203:2001 BSI 15 Novembe

34、r 2001 3 where M 1is the mass of the veneer before heating; M 0is the mass of the veneer after heating. Report the moisture content as the mean of the results. NOTE Care should be taken to prevent change in moisture content between the cutting of the veneers and the first weighing, and between remov

35、al of the veneers from the oven and the subsequent weighing. 6.1.4 Preparation of adhesive Prepare and use the adhesive according to the instructions supplied by the manufacturer. 6.1.5 Construction of the test boards Construct test boards of not less than 325 mm 325 mm in size by bonding together t

36、hree veneers with the grain of the core veneer at right angles to that of the two face veneers. The prepared adhesive may be applied to both sides of the core, or to the inner surface of each face veneer, or as the manufacturer directs, but in all cases ensure that the adhesive is uniformly spread a

37、nd the surfaces are completely coated. Use film adhesives by simple interleaving and in accordance with the manufacturers instructions. Press the test boards using the adhesive manufacturers recommended settings for temperature, pressure and time. 6.1.6 Conditioning of the test boards Follow any spe

38、cial instructions regarding conditioning of the boards provided by the adhesive manufacturer. In the absence of any special instructions by the adhesive manufacturer, freely expose the boards to air under normal room conditions for a period of at least 16 h before testing. 6.1.7 Preparation of the t

39、est pieces After conditioning the test boards, cut test pieces from them as shown in Figure 1, for each of the tests required. Prepare a sufficient number of test pieces to provide 10 valid results for each test condition to be applied. Take care that the saw cut does not impinge on the third ply. 6

40、.2 Treatment for testing resistance to cold water Immerse the test pieces completely in water at (15 5) C for 16 h to 24 h. During the treatment, ensure that the water has full access to the surfaces and edges of every test piece. Remove the test pieces and immediately test them, without drying, by

41、the method described in 6.6. Figure 1 Test pieceBS 1203:2001 4 BSI 15 November 2001 6.3 Treatment for testing resistance to hot water Immerse the test pieces completely in water at (67 2) C for 3 h. By the use of suitable racks to hold the test pieces, ensure that the water has free access to all su

42、rfaces, and ensure that it is at the specified temperature during the whole period for which the test pieces are immersed. After this high temperature treatment, cool the test pieces immediately by immersing them in water at room temperature. Leave them in this water for at least 1 h and no longer t

43、han 2 h until they are tested as described in 6.6. 6.4 Treatment for testing resistance to boiling water Immerse the test pieces completely in boiling water for 6 h. By the use of suitable racks to hold the test pieces, ensure that the water has free access to all surfaces, and ensure that it is at

44、the specified temperature during the whole period for which the tests pieces are immersed. After this high temperature, cool the test pieces immediately by immersing them in water at room temperature. Least them in this water for at lease 1 h and no longer than 2 h until they are tested as described

45、 in 6.6. 6.5 Treatment for testing resistance to micro-organisms 6.5.1 Apparatus and materials 6.5.1.1 Dish, of enamelled iron, glass or porcelain 30 mm to 40 mm deep and sufficiently large to accommodate 10 test pieces. 6.5.1.2 Sawdust, made from the sapwood of any timber, or from both heartwood an

46、d sapwood of species classed as “not durable” as defined in BS EN 350-1, such as ash, beech, birch, poplar or willow. It is essential that the material shall be free from preservatives, insecticides and added substances that inhibit or retard mould growth. 6.5.1.3 Domestic sugar solution. Dissolve 1

47、5 g of sugar in 1 000 ml of water. 6.5.1.4 Culture medium. Moisten the sawdust with the sugar solution so that it is saturated but not so wet that water can be squeezed out by hand. NOTE Normally a ratio of 1:3 by weight of dry sawdust to solution is required. Put a 25 mm layer of this preparation i

48、nto the dish, cover the dish with a sheet of glass and seal this in place with material such as modelling clay to prevent loss of moisture. Keep the dish and contents at (25 2) C for one week. 6.5.2 Pretreatment of test pieces Immerse 10 test pieces for one week in cold water to remove any free form

49、aldehyde or other mould-inhibiting materials from the wood. During this treatment, ensure that the water has full access to all surfaces and that the water is changed daily. 6.5.3 Procedure Remove the cover from the dish and press the wet test pieces into the sawdust so that their upper faces are level with the surface. Replace and re-seal the cover, and incubate the dish and contents at (25 2) C for four weeks. At the end of this period, remove the test pieces, wash them in cold water and imme