1、BRITISH STANDARD CONFIRMED AUGUST1992 BS903-A27: 1986 ISO4637:1979 Methods of testing vulcanized rubber Part A27: Determination of rubber to fabric adhesion: direct tension method ISO title: Rubber-coated fabrics Determination of rubber-to-fabric adhesion Direct tension method UDC 678.4.063:678.01:6
2、77.017.424.25BS903-A27:1986 ISO4637:1979 This British Standard, having been prepared under the directionof the Rubber StandardsCommittee, was published under the authority ofthe Board of BSI and comes into effect on 28 February1986 First published March 1969 First revision February 1986 BSI 04-1999
3、The following BSI references relate to the work on this standard: Committee reference RUM/36 Draft for comment 78/52547 DC ISBN 0 580 14882 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Rubber Standards Committee (RUM/-) to Technical
4、 Committee RUM/36, upon which the following bodies were represented: British Railways Board British Rubber Manufacturers Association ERA Technology Ltd. GAMBICA (BEAMA Ltd.) Institution of Mechanical Engineers Institution of Water Engineers and Scientists Malaysian Rubber Producers Research Associat
5、ion Ministry of Defence National College of Rubber Technology Rubber and Plastics Research Association of Great Britain SATRA Footwear Technology Centre Amendments issued since publication Amd. No. Date of issue CommentsBS903-A27:1986 BSI 04-1999 i Contents Page Committees responsible Inside front c
6、over National foreword ii 1 Scope and field of application 1 2 References 1 3 Principle 1 4 Apparatus and material 1 5 Test piece 1 6 Conditioning of test pieces 1 7 Procedure 1 8 Expression of results 2 9 Test report 2 Figure Preparation of test assembly 3 Publications referred to Inside back cover
7、BS903-A27:1986 ii BSI 04-1999 National foreword This revision of this Part of BS903, which has been prepared under the direction of the Rubber Standards Committee, is identical with ISO4637-1979 “Rubber-coated fabricsDetermination of rubber-to-fabric adhesion Direct tension method” published by the
8、international Organization for Standardization (ISO), and supersedes BS903-A27:1969which is withdrawn. Terminology and conventions. The text of the international standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions a
9、re not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appea
10、r, referring to this standard, they should be read as “British Standard” and reference to ISO4637 in clause9 should be read as “BS903-A27”. ISO/R468, to which reference is made in the text, has been superseded by ISO468 since publication of ISO4637. The Technical Committee has reviewed the provision
11、s of ISO468-1982 and of ISO2231-1973 which is also referred to in the text, and has decided that they are acceptable for use in conjunction with this standard. Related British Standards to ISO468 and ISO2231 are, respectively, BS1134 “Method for the assessment of surface texture”. Part1:1972 “Method
12、 and instrumentation” and BS3424 “Testing coated fabrics” Part2:1982 “Method4. Conditioning and selection of test specimens”. Additional information. Attention is drawn to the warning in clause7 regarding trichloroethylene. An alternative to trichloroethylene is perchloroethylene which is commonly u
13、sed in the UK. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applications. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Internat
14、ional standard Corresponding British Standard ISO/R36-1969 BS903Methods of testing vulcanized rubber Part A12:1975 Determination of the adhesion strength of vulcanized rubbers to fabrics (ply adhesion) (Technically equivalent) Summary of pages This document comprises a front cover, an inside front c
15、over, pagesi andii, pages1 to4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.BS903-A27:1986 BSI 04-1999 1 1 Scope and field of application Th
16、is International Standard specifies a method for the determination of rubber-to-fabric adhesion under direct tension. It is only suitable when the material to be tested is substantially uniform in thickness and flat or sufficiently flexible to be maintained flat under light pressure. It is particula
17、rly suitable for materials having a very thin rubber layer which are difficult to test by stripping or peeling methods. However it should be noted that the results obtained by this method will not necessarily correlate with those obtained by a stripping test such as that described in ISO/R36, Determ
18、ination of the adhesion strength of vulcanized rubbers to textile fabrics. 2 References ISO/R468, Surface roughness. ISO2231, Fabric coated with rubber or plastics Standard atmospheres for conditioning and testing. 3 Principle Bonding of metal cylinders, by means of a suitable adhesive, onto opposin
19、g faces of a test piece. Measurement of the tensile force necessary to cause separation of the rubber from the fabric, this tensile force being applied along the axis of the metal cylinders. 4 Apparatus and material 4.1 Tensile testing machine, having self-aligning jaws and a jaw separation rate of5
20、05mm/min. The response time of the force-measuring elements of the machine shall be such as to record the maximum force within an accuracy of 2% having regard to the time to failure, which is1 to2s. 4.2 Two metal cylinders, preferably aluminium,25 0,5mm in diameter and approximately50mm long, each h
21、aving at one end a means of attachment to the jaws of the tensile testing machine. The other end of each cylinder shall be accurately machined flat and perpendicular to the major axis. The flatness of this end over the whole surface is of major importance and the surface roughness of the cylinders,
22、after preparation as described in clause7, shall have an arithmetical mean deviation, R a , not greater than0,804m, when determined according to the M system of ISO/R468. 4.3 “Wet or dry” abrasive paper,600grit. 4.4 Forceps, for handling the test piece. 4.5 Jig, to enable the cylinders to be aligned
23、 during the preparation of the test assembly. A suitable device which may be made from any reasonably rigid material is shown in theFigure. 4.6 Weight, having a mass of1kg, of suitable form and dimensions for applying an axial load to the cylinders. 4.7 Ethyl cyanoacrylate adhesive, having a viscosi
24、ty of75to100mPas measured at25 C, and a minimum bond strength to the metal to be used of14MPa, measured in direct tension. The adhesive used for testing shall only wet the surface of the test piece and shall have no penetrating influence upon it. NOTEAn adhesive having a somewhat lower bond strength
25、 than that specified may be suitable depending on the rubber-to-fabric adhesion of the material being tested. However, the viscosity should be within the given limits. 5 Test piece The test piece shall consist of a square of the material under test, of lateral dimensions approximately32mm. 6 Conditi
26、oning of test pieces The test pieces shall be conditioned for not less than24h in one of the standard laboratory atmospheres specified in ISO2231. The same conditions shall be used throughout any one test or any series of tests intended to be comparable. 7 Procedure WARNING Suitable precautions shou
27、ld be taken to avoid inhalation of trichloroethylene vapour which is hazardous to health. Degrease the metal cylinders by washing in trichloroethylene after which the test surfaces shall not be touched by hand. Abrade the test surfaces of each cylinder by light lapping on the abrasive paper supporte
28、d on a flat surface such as plate glass or a surface plate, and then wipe the abraded surfaces with a clean lint-free rag soaked in trichloroethylene. Dry the cylinder by gently dabbing on a pad of filter paper. Degrease the test piece by wiping with a clean lint-free rag soaked in a1%(V/V) solution
29、 of ammonium hydroxide (A 0,880g/cm 3 ) in acetone. Allow the test piece to dry in a dust-free atmosphere at room temperature. During this and subsequent operations, the test piece shall be handled only with the forceps.BS903-A27:1986 2 BSI 04-1999 Apply one or two drops of the adhesive to the prepa
30、red face of one of the cylinders and then gently superimpose the other cylinder onto the first so that the prepared faces are opposed. Spread the adhesive uniformly over the surface by gentle and rapid circular motion of the cylinders relative to each other. Immediately separate the cylinders to avo
31、id bonding and place one of them in the jig with the prepared surface uppermost. Apply two drops of adhesive to this surface, superimpose the test piece and spread the adhesive uniformly by gentle rubbing action of the test piece on the cylinder. Apply two drops of adhesive to the upper surface of t
32、he test piece, superimpose the second cylinder and spread the adhesive by gentle rubbing action of the cylinder. Align the two cylinders in the jig with the test piece symmetrically placed. The time-lapse between the first application of adhesive and the final alignment shall not exceed90s. Place th
33、e weight on top of the upper cylinder. Carefully remove the assembly from the jig after a time of not less than5min. Allow the assembly to stand for16to24h in the standard laboratory atmosphere before performing the measurement of the tensile force. After this period, carefully mount the assembly, m
34、aintained at the standard laboratory temperature, in the tensile testing machine, ensuring proper alignment. Operate the machine at a jaw separation rate of505mm/min until the assembly breaks. Record the maximum force achieved, examine the separated test piece and note the mode of failure. Discard a
35、s an unacceptable failure any test piece which fails within the adhesive or at the adhesive interface with the rubber or metal, and carry out a repeat test. Carry out measurements on additional test pieces until five acceptable failures have been obtained. NOTEThe amount of adhesive used should be s
36、uch that a small, but not excessive, fillet of adhesive forms on the test piece around each cylinder. If metals other than aluminium are used for the cylinder, different methods of preparation may be desirable. 8 Expression of results Express the result, as “force at failure” (under the specified co
37、nditions), in kilonewtons, as the median of the test results on five test pieces. The mode of failure shall be expressed as an approximate percentage of the total bonded area of the five test pieces, using the following designations: C=cohesive failure within the rubber; RF=adhesive failure between
38、the rubber and fabric. 9 Test report The test report shall include the following information: a) sample details: a full description of the sample and its origin; b) test method: a reference to this International Standard i.e.ISO4637; c) test details: the standard laboratory temperature and humidity
39、used; d) test results: the value of the adhesion expressed in accordance with clause8, together with a description of the mode of failure in accordance with clause8; e) date of test.BS 903-A27:1986 BSI 04-1999 3 Figure Preparation of test assembly4 blankBS903-A27:1986 BSI 04-1999 Publications referr
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