1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD AEROSPACE SERIES BS 2F 14
2、2:1999 ICS 49.025.60 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Hydrolysis resistant, thermoplastic polyether polyurethane elastomer coated nylon fabric for aerospace purposesThis British Standard, having been prepared under the direction of the Engineering Sector Committ
3、ee, was published under the authority of the Standards Committee and comes into effect on 15 June 1999 BSI 06-1999 First published April 1995 Second edition June 1999 The following BSI references relate to the work on this standard: Committee reference ACE/54 Draft for comment 96/709161 DC ISBN 0 58
4、0 28246 5 BS 2F 142:1999 Amendments issued since publication Amd. No. Date Comments Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/54, Wide fabrics and coated fabrics for aerospace purposes, upon which the following
5、bodies were represented: British Rubber Manufacturers Association Ltd. Ministry of Defence Society of British Aerospace Companies Textile Finishers AssociationBS 2F 142:1999 BSI 06-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Normative references 1 3 Informa
6、tion and requirements to be agreed and documented 1 4 General requirements 1 5 Technical requirements 2 6 Packaging 6 7 Identification 6 Annex A (normative) Determination of welded peel-strength 7 Annex B (normative) Determination of resistance to ageing 8 Annex C (normative) Determination of air po
7、rosity after twisting on each face of a double sided coated fabric 9 Bibliography 10 Figure A.1 Example of a sample and a specimen 7 Figure C.1 Construction of a specimen 9 Table 1 General requirements 2 Table 2 Qualification tests 2 Table 3 Properties of coated fabrics 3 Table 4 Type tests 5ii BSI
8、06-1999 BS 2F 142:1999 Foreword This British Standard has been prepared by Technical Committee ACE/54 and is a revision of BS F 142 : 1995 which is superseded and withdrawn. This revision corrects errors in the standard and relaxes the type testing intervals, which were found in practice to be unnec
9、essarily stringent. This British Standard is one of a series for textiles of a quality suitable for aerospace purposes. During its preparation the applicable basic quality requirements contained in BS F 100 were included in the text. This standard specifies coated fabrics for use in the manufacture
10、of inflatable life saving equipment. The fabric designations specified in this standard are based on the user firm specifications RFD 572, BASE 8925, BASE 8926, BASE 8982, IAC/S 1336 and IAC/S 1344. A British Standard does not purport to include all the necessary provisions of a contract. Users of B
11、ritish 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 and ii, pages 1 to 10, an inside back cover and a back
12、cover. BSI 06-1999 1 BS 2F 142:1999 1) Available from BSI Customer Services, British Standards House, 389 Chiswick High Road, London W4 4AL. 1 Scope This British Standard specifies the requirements for six nylon fabrics coated with a thermoplastic hydrolysis resistant polyether polyurethane elastome
13、r for use in the manufacture of aerospace items, which may include items of inflatable life saving equipment. All fabrics are intended primarily for assembly by high-frequency welding techniques. In addition, all fabrics are intended to be capable of assembly by solvent based polychloroprene or poly
14、urethane adhesives. NOTE 1 The information to be supplied by the purchaser in the enquiry or order is listed in clause 3. NOTE 2 The latest revision of an Aerospace Series standard is indicated by a prefix number. In addition to the definitive requirements, this standard also requires the items deta
15、iled in clause 3 to be documented. For compliance with this standard, both the definitive requirements and the documented items have to be satisfied. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part
16、of this British Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references the latest edition of the publication referred to applies. BS 6F 100:1998, Procedure for inspection and testing of textiles for aerospace purposes
17、. BS 2F 127:1991, Specification for nylon fabrics suitable for coating with natural or synthetic elastomers for aerospace purposes. BS 2782, Methods of testing plastics. BS 2782-1, Thermal properties. BS 2782-1:Methods 120 A,120 B, 120 D and 120 E:1990, Determination of Vicat softening temperature o
18、f thermoplastics. BS 3424, Testing coated fabrics. BS 3424-4:1982, Method 6. Method for determination of breaking strength and elongation at break. BS 3424-7:1982, Method 9. Method for determination of coating adhesion and strength. BS 3424-8:1983, Methods 10A, 10B and 10C. Methods for determination
19、 of low temperature performance. BS 3424-9:1996, Rubber and plastics-coated fabrics. Determination of resistance to damage by flexing. BS 6085:1992, Methods for determination of the resistance of textiles to microbiological deterioration. BS EN 25978:1993, Rubber- or plastics-coated fabrics Determin
20、ation of blocking resistance. MIL Spec MIL-C-83489 1) , Cloth, coated, nylon, polyurethane coated. 3 Information and requirements to be agreed and documented The following information to be supplied by the purchaser shall be fully documented. For compliance with the standard both the definitive requ
21、irements specified throughout the standard and the following documented items shall be satisfied: a) if required dyed, the colour (see 5.1.1); b) pigmentation of coating (see 5.2.1); c) the width required (see 5.3.1); d) the packaging requirements (see 6.1); e) the fabric designation required, toget
22、her with the number of this British Standard, i.e. BS 2F 142:1999 (see 7.1). 4 General requirements 4.1 In addition to the requirements given in clauses 3 to 7 of this standard, the sections of BS F 100 given in Table 1 shall apply. 4.2 Unless otherwise specified in this standard, test requirements
23、shall be determined in accordance with BS F 100. In the event of a dispute, the methods of test, performance standards, inspection and acceptance limits specified in this standard shall take precedence over those of BS F 100. 4.3 Qualification tests (see Table 2) shall be performed on initial produc
24、tion of coated fabric and thereafter when any change occurs to the material, finishing treatments or to the composition of the coating compound. 4.4 A test report detailing the results of type tests (see Table 4) shall be provided by the supplier with the first delivery batch. Type tests shall be re
25、peated at intervals not exceeding 20 000 m of fabric. In addition, when any change occurs to the material, finishing treatments or to the composition of the coating compound the type tests shall be repeated.2 BSI 06-1999 BS 2F 142:1999 Table 1 General requirements (given in BS F 100) Section Title R
26、equirements and tests 1 General All requirements 2 Quality requirements Requirements for the manufacture of wide fabrics Requirements for dyed textiles Requirements for flammability (Horizontal strip test) Requirements for dimensions and tolerances general and wide fabrics Requirements for freedom f
27、rom corrosive impurities (see section 4) Requirements for freedom from faults 3 Physical tests Test for the determination of mass of wide fabrics Test for breaking strength and extension under force of wide fabrics Test for tearing strength Test for flammability (Horizontal strip test) Test for air
28、porosity of coated fabrics Test for effect of twisting on air porosity of coated fabrics Test for variation of mass across width of coated fabric Test for adhesion of surface coating 4 Chemical tests If required by section 2: test for conductivity of aqueous extract; test for pH value of aqueous ext
29、ract; test for water soluble chloride; test for water soluble sulfate. 5 Technical requirements 5.1 Uncoated textiles 5.1.1 The textile prior to coating shall be scoured, dyed and heat-set in accordance with the requirements of the specification shown in Table 3. NOTE The requirement for dyeing and
30、the colour required should be stated in the purchasers enquiry or order (see clause 3). 5.1.2 When tested in accordance with BS F 100, the fastness to light of the dyed textile shall be a minimum of standard 4, except where fluorescent colours are required when the fastness to light shall be a minim
31、um of standard 2. 5.1.3 The textile prior to coating shall conform to the requirements of BS F 100, Freedom from corrosive impurities. 5.2 Coating compounds 5.2.1 The elastomer shall be a hydrolysis resistant thermoplastic polyether polyurethane. Where pigmentation is required by the contract or ord
32、er, the pigment used shall be evenly dispersed and shall not adversely affect the weldability of the fabric, and shall contain no polyester polyurethane. NOTE A polyether polyurethane having a Vicat softening point of 608C when tested in accordance with BS 2782-1:Method 120D, usually conforms to thi
33、s requirement. 5.2.2 The coating composition shall contain not less than 90 % (v/v) of elastomer and shall not contain any waxes or other ingredients which will adversely affect the weldability of the fabric. NOTE For a clear coating containing no additives such as fire retardants, the coating compo
34、sition should contain approximately 96 % (v/v) of elastomer. 5.2.3 When tested in accordance with section 3 of BS 6085:1992 using mineral salts agar without nutrient for a period of 28 days, the coating composition shall satisfy the requirements specified in Table 2 (qualification test). 5.3 Coated
35、fabric 5.3.1 Fabrics 572, 8982, 8926 and 1336 shall be coated on one side only whilst fabrics 8925 and 1344 shall be coated on both sides with the elastomer specified in 5.2. The coating shall be even. NOTE The width required should be stated in the purchasers enquiry or order (see clause 3). 5.3.2
36、The coated fabrics shall show no weft deviation (skew and bow) exceeding 30 mm/m of width from a line perpendicular to the selvedge, except for fabric 572 which shall not exceed 70 mm/m of width. NOTE The normal required width of fabric 572 is 1 500 mm. 5.3.3 The coated fabric shall not be treated w
37、ith any dusting agents or silicone on either surface. 5.3.4 The coated fabric shall conform to Tables 2 and 3. 5.3.5 After ageing in accordance with annex B the coated fabric shall conform to Table 4 (Type tests). Table 2 Qualification tests Property Method of test Requirements Resistance to microbi
38、ological deterioration BS 6085 Grade 1 or better BSI 06-1999 3 BS 2F 142:1999 Table 3 Properties of coated fabrics Property Method of test Fabric designation 572 8982 8926 1336 8925 1344 Base textile BS 2F 127 BS 2F 127 MIL-C-83489 BS 2F 127 MIL-C-83489 BS 2F 127 No. 5 No. 5 Type 1 No. 7 a Type 1 No
39、. 7 a Mass per unit area of coating (g/m 2 ) 90 20 +15 165 15 160 15 203 220 +25 Face Face 150 15 189 218 +23 Back Back 150 15 189 218 +23 Total mass per unit area of coated fabric (g/m 2 ) BS F 100 162 12 230 20 260 20 325 220 +25 400 35 500 235 +45 Variation of mass across width (g/m 2 , maximum)
40、BS F 100 15 15 20 20 20 20 Adhesion of surface coating (N/50 mm, minimum) Dry BS 3424-7: Method 9B:1982 60 100 100 70 70 70 Wet b 45 70 70 50 55 50 Weld strength (N/50 mm, average minimum) Annex A 200 c 400 d 400 d Warp Weft 400 d Warp Weft 620 e 420 e 620 e 420 e Breaking strength of coated fabric
41、(N/50 mm/minimum) Warp BS F 100 800 750 900 1 200 900 1 200 Weft 720 750 700 900 700 800 Tear strength, double rip tongue (N, minimum) Across warp BS F 100 No requirement 25 40 45 25 20 Across weft 25 30 33 20 20 Tear strength, wounded tear (N, minimum) Across warp BS F 100 250 No requirement No req
42、uirement No requirement No requirement No requirement Across weft 200 Air porosity after twisting BS F 100 (Face) Nil f Nil Nil Nil N/A N/A Annex C (Face) N/A N/A N/A N/A Nil Nil (Back) N/A N/A N/A N/A Nil Nil4 BSI 06-1999 BS 2F 142:1999 Table 3 Properties of coated fabrics (continued) Property Meth
43、od of test Fabric designation 572 8982 8926 1336 8925 1344 Blocking resistance BS EN 25978:1993 g No blocking No blocking No blocking No blocking No blocking No blocking Flammability BS F 100 No requirement No requirement No requirement No requirement No requirement Average burn rate (mm/minute, max
44、imum) 63 Average after flame and after glow (s, maximum) 15 Average flaming time for droplets (s, maximum) 5 a The mass per unit area of the base textile shall be# 122 g/m 2 . b After immersion in 3 % aqueous sodium chloride solution for 48 h at (20 2)8C. c Minimum individual result 200 N/50 mm. d M
45、inimum individual result 320 N/50 mm. e Mean value less 2 standard deviations. f Tested at 14 k N/m 2 air pressure. g Except that the temperature shall be (70 2)8C for (168 1) h, under a load of 1.5 kg. BSI 06-1999 5 BS 2F 142:1999 Table 4 Type tests Property Method of test All fabric designations e
46、xcept 572 Fabric designation 572 Cold crack temperature (8C, maximum) BS 3424-8:Method 10A:1983 240 240 Determination of resistance to ageing: Annex B appearance B.2.8 No brittleness, no softening, no tackiness, no cracks, no separation or other signs of deterioration No brittleness, no softening, n
47、o tackiness, no cracks, no separation or other signs of deterioration adhesion of surface coating dry (N/50 mm, mininum) BS 3424-7:Method 9B:1982 50 50 retained weld strength (% of actual unaged average value, minimum) Annex A 90 75 blocking resistance BS EN 25978:1993 a No blocking No blocking flex
48、ibility BS 3424-9:1996 No visible cracks or delamination when examined under 310 magnification after 100 000 cycles No visible cracks or delamination when examined under 310 magnification after 80 000 cycles cold crack temperature (8C, maximum) BS 3424-8:Method 10A:1983 240 240 Flammability: average
49、 burn rate (mm/minute, maximum) BS F 100 63 b No requirement average after flame and after glow (s, maximum) BS F 100 15 b No requirement average flaming time for droplets (s, maximum) BS F 100 5 b No requirement a Except that the temperature shall be (70 2)8C for (168 1) hour, under a load of 1.5 Kgs. b Property tested on fabric designation 8926 only.6 BSI 06-1999 BS 2F 142:1999 1) Marking BS 2F 142:1999 on or in relation to a product represents a manufacturers declaration of conformity, i.
