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1、BRITISH STANDARD AEROSPACE SERIES BS 2X 26:2001 Superseding BS X 26:1966 Doping and finishing schemes for fabric covered aircraft ICS: 49.040 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:37 GMT+00:00 2006, Uncontr
2、olled Copy, (c) BSI BS 2X 26:2001 This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Board and comes into effect on 15 March 2001 BSI 03-2001 The following BSI references relate to the work on this s
3、tandard: Committee reference ACE/44 Draft for comment 99/701779 DC ISBN 0580 33261 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee ACE/44, Protective treatments and aircraft finishes, to Subcommittee ACE/44/-/1, Paints
4、for aerospace use, upon which the following bodies were represented: British Coatings Federation Ltd. Ministry of Defence Oil b) number of this British Standard, i.e. BS 2X 262); c) manufacturers name and recognized trade mark; d) batch number; e) mixing and thinning instructions; f) date of manufac
5、ture. 7.2 Each component shall be identified for ordering purposes by the number of this British Standard and the full description as specified in Column 1 of Table 1, together with, in the case of dopes, the relevant designation quoted in Table 1 or, in the case of finishes, the colour and gloss re
6、quired. 2) Marking BS 2X 26 : 2001 on or in relation to a product represents a manufacturers 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 solely the claimants responsibility. Such a d
7、eclaration is not to be confused with third party certification of conformity. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2X 26:2001 BSI 03-2001 3 Table 1 General properties Designation:No. 751No. 752No. 753 Tautness:LowMediumHigh De
8、scription of componentsDry weightNormal number of coats Dry weightNormal number of coats Dry weightNormal number of coats g/m2g/m2g/m2 For all finishes other than aluminium Red oxide tautening dope68.0 13.5325.5 5.01 Transparent tautening dope68.0 13.53 or 4161.0 32.0 6 or 7 Aluminium non-tautening
9、finish34.0 7.02 Aluminium tautening dope34.0 7.0.234.0 7.02 Pigmented non-tauteninga34.0 7.01 or 234.0 7.01 or 234.0 7.01 or 2 Transparent non-tautening finishb34.0 7.01 or 234.0 7.01 or 234.0 7.01 or 2 For an aluminium finish Red oxide tautening dope102.0 20.5 425.5 5.01 Transparent tautening dope6
10、8.0 13.53 or 4195.0 39.0 8 Aluminium non-tautening finish34.0 7.0234.0 7.0234.0 7.02 Transparent non-tautening finishb34.0 7.01 or 234.0 7.01 or 234.0 7.01 or 2 a For colour and finish matching purposes only, a weight addition of not more than 68 g/m2 will be permitted for yellow, white and sky fini
11、shes. b Only where a glossy finish is required. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2X 26:2001 4 BSI 03-2001 Table 2 Tests on tautening dopes TestTest panel, preparation and paint system ConditionsTest methodRequirement 1Condi
12、tionComponent in the original or laboratory container BS 3900-A2The material shall be free from extraneous matter and shall show no objectionable separation, settling or other defect 2VOCWhen prepared for use ASTM D3960?reference valuea 3Shelf lifeAfter 12 months at (0 to 30) C. Component in the ori
13、ginal container Table 2 tests 1, 4, 7, and 10 Shall meet the requirements specified After 6 months in a tropical climate as defined in BS 3900-F6 4Non-volatile matter Component in the original or laboratory container BS 3900-B18Transparent tautening dope 9.5 % mass Red oxide tautening dope 10.0 % ma
14、ss Aluminium tautening dope 12.0 % mass 5Aluminium content Component in the original or laboratory container e.g. centrifuging or filtration Aluminium tautening dope 2.5 % mass 6Dry red oxide (Fe2O3) pigment content Component in the original or laboratory container e.g. centrifuging or filtration Re
15、d oxide tautening dope approximately 0.5 % mass 7ApplicationA.1.2 A.2.1.2 and A.2.1.4 Single coat. Film allowed to dry under a) conditions specified in BS EN 23270 b) (30 2) C and 80 % RH, with thinners to Def. Stan. 80-38 used. c) Annex E. Visual examination, normal corrected vision The film shall
16、be smooth and continuous and free from blushing or other defects. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2X 26:2001 BSI 03-2001 5 Table 2 Tests on tautening dopes (concluded) TestTest panel, preparation and paint system Condition
17、sTest methodRequirement 8ColourA.1.1, A.2.1.224 hours after application under diffuse daylight BS 3900-D1Shall match the colour of the appropriate standard in BS 381C, as specified by the purchaser. 9GlossA.1.1, A.2.1.224 hours after application using a 60 glossmeter BS 3900-D5 Matt finish 15.5 % ma
18、ss Transparent non-tautening 16.0 % mass 5Aluminium content Component in the original or laboratory container e.g. centrifuging or filtration Aluminium non-tautening finish 2.5 % mass 6ApplicationA.1.1, A.2.2.2 Single coat. Film allowed to dry under: a) conditions specified in BS EN 23270. b) (30 2)
19、 C and 80 % RH, with thinners to Def. Stan. 80-38 used. c) Annex E Visual examination, normal corrected vision The film shall be smooth and continuous and free from blushing, wrinkling, bubbling or other defects. 7ColourA.1.2, A.2.2.2 24 hours after application, under diffuse daylight BS 3900-D1The
20、colour shall match the appropriate standard in BS 381C, as specified by the purchaser. 8GlossA.1.2, A.2.2.2 24 hours after application using 60 glossmeter BS 3900-D5 Matt finish?5.0 units. 9Tautness retention on application of non-tautening finishes A.1.1, A.2.2.3 24 hours after application Annex BT
21、he non-tautening finish shall not reduce the tautness of the system by more than 20 % compared with tautness values determined before application. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2X 26:2001 BSI 03-2001 7 Table 3 Tests on n
22、on-tautening finishes (concluded) TestTest panel, preparation and paint system ConditionsTest methodRequirement 10 Resistance to high temperatures A.1.1, A.2.2.3After application, allow to dry to constant tautness with both surfaces of fabric freely exposed to the air. Annex CNo sign of cracking 11
23、Resistance to natural weathering A.1.1 without plywood, A.2.2.3, A.2.3 24 hours after application of the final coat Annex DNo cracking, chipping, flaking or blistering of the film, nor shall there be more than a slight change in colour and in the case of glossy finish, slight loss of gloss. Slight c
24、halking shall be disregarded. The underlying coats shall not be visible through the final coat and the tautness shall not be materially impaired. The tensile strength shall be not less than the tensile strength of the undoped fabric a The reference value is that which is established during type appr
25、oval unless otherwise agreed between manufacturer and purchaser. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2X 26:2001 8 BSI 03-2001 Annex A (normative) Preparation of test panels A.1 Preparation of substrates A.1.1 Test frame Where
26、specified, a strong rectangular wooden frame shall be used reinforced with metal to prevent warping, measuring (250 250) mm internally, with two holes 4.8 mm in diameter bored through one of the sides, and having a piece of 12.7 mm 5-ply wood, with a central hole 250 mm in diameter, screwed to one f
27、ace (see Figure F.1) and covered on the plywood face with linen fabric to BS 9F 1 under a tension of approximately 36 gf/mm width in the warp and 18 gf/mm in the weft. A.1.2 Where specified use test panels made from unabraded aluminium sheet, measuring (150 50 0.8) mm conforming to BS L 163, which h
28、ave been solvent degreased in accordance with BS EN ISO 1514. A.2 Application A.2.1 Dopes A.2.1.1 The dopes shall be supplied ready for use by brushing and shall be applicable by spraying when diluted with approximately 10 % thinners to Def. Stan. 80-38. A.2.1.2 Unless otherwise specified apply the
29、dope by spraying it in accordance with Table 1, when thinned as specified in A.2.1.1. A.2.1.3 Uniformly apply each tautening dope that is to be included in the scheme to an individual frame, to give an added film weight of (119 17.0) g/m2 this quantity being the added weight per square metre, after
30、drying to constant tautness with both surfaces of the fabric freely exposed to the air. A.2.1.4 Brush apply the dope in accordance with Table 1. A.2.2 Non-tautening finishes A.2.2.1 The non-tautening finishes shall be applicable by spraying when diluted with approximately 30% of thinners to Def. Sta
31、n. 80-38. A.2.2.2 Unless otherwise specified apply the finish by spraying it in accordance with Table 1 when thinned as specified in A.2.2.1. A.2.2.3 Unless otherwise specified, spray apply the non-tautening finish in the number of coats and to the film weights given in Table 1, over fabric already
32、tautened by the use of tautening dopes, applied as specified in A.2.1.2. A.2.3 Protect the back of the frame with water-proof material. Annex B (normative) Method for the determination of tautness properties B.1 Measure the tautness by any approved method. In case of a dispute use the following meth
33、od: B.2 After conditioning, fit the frame, still in the conditioned atmosphere, with an airtight back and connect it through the holes in its side with a sensitive and accurate manometer and any device, such as a water pump, adjusted to reduce the air pressure inside the frame by an amount equivalen
34、t to 51 mm of water, including a large reservoir in the system to smooth out variations in the pressure. Measure the resulting depression (d mm) of the centre of the circle of unsupported fabric, using any instrument accurate to within 0.025 mm that does not impose a load exceeding 5 g on the area o
35、f unsupported fabric. B.3 The tautness (T) in the doped fabric is given by the equation: where d is in mm. T 2 d - -kgf cm?= Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2X 26:2001 BSI 03-2001 9 B.4 Determine the weight of the added do
36、pe by the following method: Cut a minimum area (23 200 mm2) from the circle of unsupported dope fabric, weigh it, remove the dope by solvents and weigh it again. Record the difference in weight (A). Cut a piece of undoped fabric of the same area from the same length as was used to cover the test fra
37、me, weigh it, apply the same solvent treatment as before under the same atmospheric conditions and weigh it again. Record the difference in weight (B). Apply (B) as a correction to (A) and calculate the weight in grams of dope per square metre of fabric. Annex C (normative) Method of test for resist
38、ance to high temperatures Cut from each doped fabric, in the warp direction, a strip of size 25 mm by not less than 150 mm, heat it at a temperature of not less than 95 C for 96 hours, cool to room temperature and bend it double along the weft threads round a cylindrical bend test mandrel conforming
39、 to BS EN ISO 1519, moving the strip through at least 130 mm of its length over the mandrel during the bending operation. Use a 3.0 mm diameter mandrel for black finishes and a 2.0 mm diameter mandrel for all other colours. Annex D (normative) Method of test for resistance to natural weathering D.1
40、Expose the frame in the open at an angle corresponding to maximum sunlight in the UK, facing south at an angle of 45 (see BS 3900-F6) for a period of 6 months, which shall include at least 2 months from May to August inclusive. D.2 During the exposure examine the frame at intervals for adhesion of t
41、he dope, cracks, etc., and note the general behaviour in wet and dry weather. Also make comparative tautness tests (Annex B) at intervals in both wet and dry weather. D.3 After exposure for 6 months, cut from the fabric, in the warp direction, six specimens 25 mm wide and sufficiently long to allow
42、178 mm between the jaws of a testing machine, condition them (see 5.1.2) for 18 hours and then determine the tensile strengths. Also determine, by the same method and under the same atmospheric conditions, the tensile strength of a piece of untreated fabric cut from the same length of fabric as was
43、used to cover the frame. Annex E (normative) Method of test for freedom from film defects E.1 Test conditions Temperature (18 to 21) C; Relative humidity: (65 to 70) %; Air speed of approximately 1m/sec. E.2 Store test frames, samples of the dopes and finishes to be tested and the brushes to be used
44、 for application under the above test conditions for not less than 2 hours. Then apply the coating as specified. Allow the coating to dry under the above test conditions and examine visually. Annex F (normative) Type approval F.1 When the manufacturer is required to prove conformance to this British
45、 Standard, the following shall be provided: a) test evidence that the material conforms to the requirements of this British Standard; b) wet sample of the material; c) declaration of composition including the percentage and nature of all ingredients; d) reference values if required, e.g. VOC content
46、. F.2 After type approval has been granted, there shall be no change in the product formulation unless this is approved by the approving authority. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2X 26:2001 10 BSI 03-2001 Figure F.1 Test
47、frame for doped fabric 250 (REF) Fabric mounting face X X View of section X-X Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 14:17:37 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS
48、 2X 26:2001 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions Briti
49、sh Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax