1、BRITISH STANDARD BS 5350-G3: 1987 Methods of test for Adhesives Part G3: Determination of ability of anaerobic adhesives to set on metal surfaces UDC 665.93:620.179.4:620.176.24BS5350-G3:1987 This British Standard, having been prepared under the directionof the Adhesives Standards Committee, was pub
2、lished under the authorityofthe Board of BSIandcomes into effect on 27 February 1987 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference ADC/9 Draft for comment 86/50275 DC ISBN 0 580 15626 5 Foreword This Part of BS5350 has been prepared under the direc
3、tion of the Adhesives Standards Committee. Group G comprises several test methods chiefly intended for the assessment of the performance characteristics of anaerobic adhesives used primarily in mechanical engineering. They can also form part of a programme of assessment of the behaviour of anaerobic
4、 adhesives under a variety of environmental conditions. The method in this Part is based on a procedure in Aerospace Material Specification DTD5628 “Test methods and procurement procedures for one-part anaerobic polymerisable compounds for locking, sealing and retaining”, issued by the Procurement E
5、xecutive of the Ministry of Defence, but the procedure has been modified to avoid the use of cadmium. WARNING NOTE. This British Standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability a
6、nd does not absolve the user from legal obligations relating to health and safety at any stage. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does
7、 not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. Thi
8、s will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date of issue CommentsBS5350-G3:1987 BSI 10-1999 i Contents Page Foreword Inside front cover 0 Introduction 1 1 Scope 1 2 Definition 1 3 Principle 1 4 Apparatus and materials 1 5 Test p
9、ieces 1 6 Bonding of adherends 2 7 Procedure 2 8 Expression of results 2 9 Test report 2 Figure 1 Test assembly 3 Publications referred to Inside back coverii blankBS5350-G3:1987 BSI 10-1999 1 0 Introduction Anaerobic adhesives are widely used as a means of securing engineering components. The setti
10、ng of an adhesive is catalysed by the adherend surface being used. This method is used to assess the capacity of the adhesive to set on difficult metals using one example, zinc, under specified conditions. The test does not necessarily represent the performance of the material in service. 1 Scope Th
11、is Part of BS5350 describes a method for the determination of the ability of anaerobic adhesives to set on metal surfaces. NOTEThe titles of the publications referred to in this Part of BS5350 are listed on the inside back cover. 2 Definition For the purposes of this Part of BS5350, the following de
12、finition applies. 2.1 anaerobic adhesive an adhesive that cures spontaneously in the absence of oxygen, curing being inhibited by the presence of oxygen and catalysed by metal ions 3 Principle The adhesive under test is applied to a metal adherend with a zinc surface and the adherend is bonded with
13、an identical adherend to form a crosslap joint. The shear force required to separate the joint is measured. 4 Apparatus and materials 4.1 Cabinet, capable of being controlled at 23 2 C. 4.2 Means for clamping the lower block of the test assembly during the tensile test 4.3 Spring balance, range 0 to
14、 100 N, accurate to0.5N. 4.4 Timer 4.5 Plate glass sheet, flat, 200mm wide 200mm long 5mm thick. 4.6 Distilled water, complying with BS3978. 4.7 Abrasive paper, silicon carbide, waterproof, grade P600 complying with BS871. 4.8 Solvent, acetone or propan-2-ol, laboratory reagent grade. 4.9 Tweezers,
15、tongs or disposable gloves, for handling treated components. 5 Test pieces 5.1 Adherends The adherends shall be either: a) two blocks of zinc 1)of 99.95 % (m/m) purity and 100mm long 25mm wide; or b) two blocks of steel of the same dimensions, but surfaced with an adhesively-bonded layer of99.95% (m
16、/m) zinc, of minimum thickness1mm, on one or both of the100mm 25mm surfaces. The thickness of the blocks shall be such that their masses are each 5005g. One end of each block shall be provided with a means of attaching it to the spring balance (4.3) during the test. 1) For information on the availab
17、ility of suitable zinc blocks apply to Enquiry Section, BSI, Linford Wood, Milton Keynes MK14 6LE, enclosing a stamped addressed envelope for reply.BS5350-G3:1987 2 BSI 10-1999 5.2 Preparation of adherend surfaces Place a sheet of the abrasive paper (4.7) flat on the plate glass sheet (4.5) and wet
18、its surface thoroughly with the distilled water (4.6). Hone one of the zinc surfaces of each of the pair of blocks by moving it forwards and backwards lengthways on the abrasive surface, applying no downward pressure other than that exerted by the mass of the block. Ensure that the paper is always w
19、et and continue abrading until the surface of the metal is free from scratches and extraneous material on visual inspection, using normal or corrected vision. Wash the abraded blocks thoroughly in distilled water, wipe off excess water with a clean tissue, rinse them in the solvent (4.8) and allow t
20、hem to dry. Take precautions to avoid contamination in subsequent handling (see4.9). 6 Bonding of adherends Place the prepared blocks in the cabinet (4.1), controlled at 23 2 C for at least 15min. After removing the blocks from the cabinet, place one block with its prepared surface uppermost on a fl
21、at surface and apply one drop of the test adhesive to the centre of the upper surface. Gently place a second block, prepared surface downwards, on the lower block with its long axis at right angles to the long axis of the lower block and with its centre coincident with the centre of the lower block
22、to form a cross, and start the timer (4.4). Maintain this test assembly in the cabinet at23 2 C for 30 1min. 7 Procedure At the end of this curing period remove the test assembly from the cabinet and immediately clamp(4.2) the lower block. Attach the spring balance (4.3) to one end of the upper bloc
23、k and apply a steadily increasing shear force parallel to the long axis of the upper block and to the plane of the joint until either the blocks separate or a force of 25N is exceeded (seeFigure 1). If separation occurs, note the force at which this starts. NOTEBlocks may be re-used after cleaning.
24、To remove the old adhesive clean the surface with abrasive paper, remove abraded material and polish with a fresh sheet of abrasive paper as described in5.2. 8 Expression of results If the blocks have not separated up to and including a force of 25N, record the result as a pass,i.e. the adhesive is
25、deemed to be able to set on metal surfaces. If the force at separation is less than 25N, report the result as the value, in newtons, at which the separation starts. 9 Test report The test report shall state the following: a) a designation of the adhesive, giving all information required for complete
26、 identification of the sample; b) the test result; c) that the method of test was conducted in accordance with this Part of BS5350 or, if it was not, deviations from the method.BS5350-G3:1987 BSI 10-1999 3 Figure 1 Test assembly4 blankBS5350-G3:1987 BSI 10-1999 Publications referred to BS 871, Speci
27、fication for abrasive papers and cloths. BS 3978, Water for laboratory use. Aerospace Material Specification DTD5628 Test methods and procurement procedures for one-part anaerobic polymerisable compounds for locking, sealing and retaining. Procurement Executive, Ministry of Defence 2) . 2) Referred
28、to in the foreword only and available from HMSO, 49 High Holborn, London WC1 for personal callers, or by post from HMSO, PO Box276, London SW8 5DT.BS 5350-G3: 1987 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing B
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