1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED MAY 1998 BS 3J 12:1991 (Superseding BS 2J 12) Specification for Pressure sensitive adhesive identification tapeBS3J12:1991 This British Standard, having been prepared under the directionof the Aerospace Standards Policy Committee, waspublished under the au
2、thorityof the Board ofBSIandcomes into effect on 28February1991 BSI 03-2000 The following BSI references relate to the work on this standard: Committee reference ACE/40 Draft for comment 89/70679 DC ISBN 0 580 18436 6 Committees responsible for this British Standard The preparation of this British S
3、tandard was entrusted by the Aerospace Standards Policy Committee (ACE/-) to Technical Committee ACE/40, upon which the following bodies were represented: Adhesive Tape Manufacturers Association British Aerospace plc Ministry of Defence Amendments issued since publication Amd. No. Date of issue Comm
4、entsBS3J12:1991 BSI 03-2000 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Construction 1 3 Dimensions 1 4 Colour 1 5 Freedom from defects 1 6 Samples for testing 1 7 Breaking strength 1 8 Adhesive strength to steel 1 9 Flagging characteristics 2 10 Resistance to w
5、ater 2 11 Water vapour permeability 2 12 Freedom from water-soluble corrosive impurities 2 13 Heat ageing 2 14 Packaging 2 15 Storage 2 16 Identification 2 17 Marking 2 Appendix A Information to be supplied by the purchaser 3 Appendix B Conditioning of test samples and test pieces 3 Appendix C Metho
6、d for determination of breaking strength 3 Appendix D Method for determination of adhesive strength to steel 3 Appendix E Method for determination of flagging characteristics 4 Appendix F Method for determination of resistance to water 5 Appendix G Method for determination of water vapour permeabili
7、ty 5 Appendix H Preparation of a water extract for pH and conductivity determinations 6 Appendix J Method for determination of pH value of a water extract 6 Appendix K Method for determination of conductivity of a water extract 6 Appendix L Method of test for heat ageing 7 Figure 1 Steel test plate
8、7 Figure 2 Typical arrangement for stripping the tape from the plate 7 Figure 3 Flagging test 8 Publications referred to Inside back coverBS3J12:1991 ii BSI 03-2000 Foreword This British Standard, prepared under the direction of the Aerospace Standards Policy Committee, is one of a series for pressu
9、re-sensitive adhesive tapes of a quality suitable for aerospace purposes and is a revision of BS2J12, which is withdrawn. This revision includes guidance on information to be supplied by the purchaser, and deletes reference to a toluene bath for the cleaning of samples. Alternative cleaning methods
10、are specified. 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 not of itself confer immunity from legal obligations. Summary of pages This docu
11、ment comprises a front cover, an inside front cover, pagesi andii, pages1 to8, 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 the inside front cover.BS3J12:1991 BSI
12、03-2000 1 1 Scope This British Standard specifies requirements for pressure-sensitive adhesive identification tape for aerospace purposes, such as the identification marking of aircraft parts. NOTE 1The tape, which may be coloured or printed with a legend, is suitable for application to pipelines, a
13、nd is resistant to moisture. It is not suitable for use in situations where the temperature exceeds70 C and its use where it may be exposed to severe climatic conditions for other than brief periods is not recommended. NOTE 2The tape is not resistant to certain aircraft fluids, but it may be possibl
14、e to protect it from such fluids by coating with a suitable lacquer. NOTE 3The information to be supplied by the purchaser in the contract or order is listed inAppendix A. NOTE 4The titles of the publications referred to in this standard are listed on the inside back cover. NOTE 5The latest revision
15、 of an Aerospace Series standard is indicated by a prefix number. 2 Construction 2.1 The tape shall consist of a water-resistant film base material, such as unplasticized polyvinyl chloride, polypropylene or polyethylene terephthalate film, of maximum thickness0.065mm, uniformly coated on one side w
16、ith a pressure-sensitive adhesive. 2.2 The tape shall be supplied in roll form, with the adhesive side innermost, on a suitable core of the same width as the tape. 2.3 The tape shall be opaque. NOTEColouring may be achieved by the incorporation of pigments in the adhesive, by the use of a pigmented
17、film or dyed film base, or by a combination of these methods. 2.4 If a legend is required it shall be clearly and uniformly printed in fast colours. NOTEThe purchaser should state in the contract or order the legend required and whether or not the legend is required (seeAppendix A). 3 Dimensions The
18、 tolerances on the width of the finished tape shall be one of the following: a) 1.0mm for tapes up to and including19mm; b) 1.5mm for tapes over19mm. NOTEThe length and width of the finished tape should be stated by the purchaser in the contract or order (seeAppendix A). The finished tape is usually
19、 supplied in lengths of33m and in one of the following widths: a) 12 mm; b) 15 mm; c) 19 mm; d) 22 mm; e) 25 mm; f) 38 mm; g) 50 mm. 4 Colour The base colour of the tape shall be one of the following colours given in BS6746C: a) blue; b) brown; c) green; d) orange; e) red; f) yellow; g) grey. NOTETh
20、e colour should be stated by the purchaser in the contract or order (seeAppendix A). 5 Freedom from defects 5.1 When the tape is unrolled there shall be no tearing of the base material. 5.2 Each roll shall be reasonably free from telescoping, gapping or other forms of distortion. When unrolled the t
21、ape shall show negligible transference of the adhesive to the backing of the underlying turn. NOTECare should be taken not to unwind tapes rapidly at temperatures below10 C. 6 Samples for testing 6.1 The test samples shall be conditioned in accordance withAppendix B. 6.2 A batch of tape shall consis
22、t of a number of rolls designated as a batch by the manufacturer and substantially uniform in quality. 6.3 From each batch at least one roll shall be examined for compliance with clauses2 to5 inclusive and tested for compliance with clauses7 to13 inclusive. 7 Breaking strength When determined in acc
23、ordance withAppendix C, the breaking strength of the tape shall be not less than18N per10mm width. 8 Adhesive strength to steel When determined in accordance withAppendix D, the adhesive strength of the tape shall be not less than1.8N per10mm width. The tape shall separate from the plate without vis
24、ible off-setting of the adhesive.BS3J12:1991 2 BSI 03-2000 9 Flagging characteristics When determined in accordance withAppendix E, the amount unwound shall not exceed2mm. 10 Resistance to water When determined in accordance withAppendix F, the tape shall comply with clause8 and there shall be no lo
25、ss of definition or clarity in the printing of the legend if present, and no substantial alteration in the colour. 11 Water vapour permeability When determined in accordance withAppendix G, the water vapour permeability of the tape shall be not more than65g/m 2per24h. 12 Freedom from water-soluble c
26、orrosive impurities 12.1 When determined in accordance withAppendix J, the pH value of the aqueous extract shall be not less than5.5 and not more than8.0. 12.2 When determined in accordance withAppendix K, the conductivity of the aqueous extract shall be not more than2.5mS/m. 13 Heat ageing When tes
27、ted in accordance withAppendix L, the material shall remain firmly adhered to the surfaces to which it is applied, the edges of the test specimens shall not show any significant signs of lifting from position and the colour and/or legend, if present, shall be substantially unchanged. 14 Packaging Th
28、e rolls of tape shall be packed in such a manner that: a) they are protected from moisture, dust and sunlight; b) they can be easily separated; c) they are reasonably protected from damage in normal transit conditions; d) they are all packed flat on their cut edges. 15 Storage When stored flat on th
29、eir cut edges, in the original unopened packing, at temperatures between10 C and30 C and between45% and75% r.h., the rolls of tape shall comply with this British Standard after a period of12months. NOTEHigher temperatures and more humid conditions accelerate deterioration of the tape. It is recommen
30、ded that stored material is used in the chronological order in which it is received. 16 Identification The tape shall be identified by the number of this British Standard, together with the width and colour required. For example, blue50mm wide tape shall be identified as “BS3J12/50mm/blue”. NOTEThe
31、number of this British Standard, together with the width and colour required should be stated by the purchaser in the contract or order (seeAppendix A). 17 Marking 17.1 All markings shall be neat and indelible. Each transit carton within a complete package shall be marked with at least the following
32、: a) the batch identification code number; b) a brief description and the number of this British Standard, i.e.Identification tape:BS3J12 1) ; c) the colour and/or the legend; d) the width of the tape; e) the length of a coil; f) the quantity of contents; g) the contractors initials or recognized tr
33、ade marks; h) the words, “THIS SIDE UP” and/or a suitable pictogram to ensure that packages are properly stacked in store. 17.2 If a transit carton within a complete package is to be marked with additional information it shall be as follows: a) the date of manufacture, i.e.the month and year; b) the
34、 date of despatch; c) the contract or order number. NOTE 1The purchaser may request additional markings. NOTE 2The request for any additional markings should be stated by the purchaser in the contract or order (seeAppendix A). 1) Marking BS3J12 on or in relation to a product represents a manufacture
35、rs declaration of conformity, i.e.a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confused with third party certificat
36、ion of conformity, which may also be desirable.BS3J12:1991 BSI 03-2000 3 Appendix A Information to be supplied by the purchaser The following information should be stated by the purchaser in the contract or order: a) the number of this British Standard, i.e.BS3J12 (seeclause16); b) the legend requir
37、ed (see2.4); c) the length required (seeclause3); d) the width required (seeclauses3 and16); e) the colour required (seeclauses4 and16); f) whether any additional markings are required (see note2 to17.2). Appendix B Conditioning of test samples and test pieces B.1 Immediately before pieces for testi
38、ng are taken, condition each sample roll for at least24h at23 2 C and505%r.h. Remove and discard the three outer turns before cutting the test pieces from the conditioned roll. B.2 Condition all individual test pieces in accordance with the relevant appendix and test, preferably in the same atmosphe
39、re. If testing is not conducted in the same atmosphere, commence the test within3min of removal of each test specimen from the atmosphere described inB.1. B.3 A suitable chamber and the methods of obtaining the required conditioning atmosphere are given in BS3718. Appendix C Method for determination
40、 of breaking strength C.1 Apparatus C.1.1 Power driven tensile testing machine, equipped with a continuous indicating device calibrated at intervals of0.2N or less and with a rate of movement of the driven jaw of300 30mm/min. In cases of dispute, a low inertia type of machine shall be used. C.2 Prec
41、onditioning Condition the sample roll in accordance withB.1. C.3 Test pieces Take three strips of tape, each of sufficient length to give an initial test length of100mm, from the sample roll at intervals of not less than300mm. C.4 Conditioning Condition the test pieces by freely suspending them at23
42、 2 C and505%r.h. for at least2h immediately before testing. C.5 Procedure Insert the test piece into the grips or jaws of the machine so that the load is applied evenly across the width and the initial test length is100mm. Elongate the test piece until it breaks and record the maximum force during t
43、he test. Make three valid determinations, disregarding any test in which the break occurs within5mm of either grip or jaw. Ensure that during the test the tape does not slip in the grips or jaws of the testing machine. C.6 Result From the central value of the three recorded maximum forces, calculate
44、 and report the breaking strength in newtons per10mm width. Appendix D Method for determination of adhesive strength to steel D.1 Solvents D.1.1 One of the following solvents is required: a) methanol; b) butanone (ethyl methyl ketone); c) acetone; d) sulphur free toluene. NOTEAll the above solvents
45、should be of general purpose chemical grade. D.2 Apparatus D.2.1 Five rectangular test plates of stainless steel, within the following compositional limits: A convenient size of plate is200mm 50mm; the thickness shall be not less than2mm. The plate is marked at equidistant intervals of12.5mm, along
46、both of the longer edges, the first mark being made at50mm from end A (seeFigure 1). The central40mm width of the test plate shall be free from marks. The test surface of the plate shall be polished to give an abrasive satin finish (180grit), the direction of gritting being parallel to the longer si
47、de of the plate. The surface roughness shall be determined from the mean line of the profile in accordance with BS1134-1 and shall comply with the following: 0.05 4m R a 0.4 4m R max 3 4m where a) carbon 0.16% max.; b) silicon 0.20% min.; c) manganese 2.00% max.; d) nickel 8% to 14%; e) chromium 11%
48、 to 19%. R a is the arithmetical mean deviation; R max is the maximum height of irregularities.BS3J12:1991 4 BSI 03-2000 D.2.2 Solid brass roller, 80mm in diameter and44mm in width, covered with rubber approximately6mm thick having an IRHD (International Rubber Hardness Degree) of60 5; the mass of t
49、he roller shall be approximately2kg. D.2.3 Power driven tensile testing machine, as described inC.1.1 but with the back stop or ratchet pawl removed in the case of a pendulum test machine. D.2.4 Cleaning materials D.2.4.1 4-hydroxy-4-methylpentan-2-one (diacetone alcohol). D.2.4.2 Pharmaceutical quality, lint free cotton wool or Paper tissue. D.3 Preconditioning Condition the sample roll in accordance withB.1. D.4 Test pieces Take five strips of tape450mm long, unwound radially from the roll at intervals of300mm at a rate of approximately300mm/s. Avoi
