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 LAWBS 2X 26:2001 This British Standard, having been prepared under the direction of the Eng
2、ineering 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 standard: Committee reference ACE/44 Draft for comment 99/701779 DC ISBN 0580 33261 6 Committees responsible
3、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 for aerospace use, upon which the following bodies were represented: British Coatings Federation Ltd. Minist
4、ry of Defence Oil b) number of this British Standard, i.e. BS 2X 26 2) ; c) manufacturers name and recognized trade mark; d) batch number; e) mixing and thinning instructions; f) date of manufacture. 7.2 Each component shall be identified for ordering purposes by the number of this British Standard
5、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 required. 2)Marking BS 2X 26 : 2001 on or in relation to a product represents a manufacturers declaration of
6、 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 declaration is not to be confused with third party certification of conformity.BS 2X 26:2001 BSI 03-2001 3 T
7、able 1 General properties Designation: No. 751 No. 752 No. 753 Tautness: Low Medium High Description of components Dry weight Normal number of coats Dry weight Normal number of coats Dry weight Normal number of coats g/m 2 g/m 2 g/m 2 For all finishes other than aluminium Red oxide tautening dope 68
8、.0 13.5 3 25.5 5.0 1 Transparent tautening dope 68.0 13.5 3 or 4 161.0 32.0 6 or 7 Aluminium non-tautening finish 34.0 7.0 2 Aluminium tautening dope 34.0 7.0. 2 34.0 7.0 2 Pigmented non-tautening a 34.0 7.0 1 or 2 34.0 7.0 1 or 2 34.0 7.0 1 or 2 Transparent non-tautening finish b 34.0 7.0 1 or 2 34
9、.0 7.0 1 or 2 34.0 7.0 1 or 2 For an aluminium finish Red oxide tautening dope 102.0 20.5 4 25.5 5.0 1 Transparent tautening dope 68.0 13.5 3 or 4 195.0 39.0 8 Aluminium non-tautening finish 34.0 7.0 2 34.0 7.0 2 34.0 7.0 2 Transparent non-tautening finish b 34.0 7.0 1 or 2 34.0 7.0 1 or 2 34.0 7.0
10、1 or 2 a For colour and finish matching purposes only, a weight addition of not more than 68 g/m 2will be permitted for yellow, white and sky finishes. b Only where a glossy finish is required.BS 2X 26:2001 4 BSI 03-2001 Table 2 Tests on tautening dopes Test Test panel, preparation and paint system
11、Conditions Test method Requirement 1 Condition Component in the original or laboratory container BS 3900-A2 The material shall be free from extraneous matter and shall show no objectionable separation, settling or other defect 2 VOC When prepared for use ASTM D3960 reference value a 3 Shelf life Aft
12、er 12 months at (0 to 30) C. Component in the original 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 4 Non-volatile matter Component in the original or laboratory container BS 3900-B18 Transparent tautening
13、 dope 9.5 % mass Red oxide tautening dope 10.0 % mass Aluminium tautening dope 12.0 % mass 5A l u m i n i u m content Component in the original or laboratory container e.g. centrifuging or filtration Aluminium tautening dope 2.5 % mass 6 Dry red oxide (Fe 2 O 3 ) pigment content Component in the ori
14、ginal or laboratory container e.g. centrifuging or filtration Red oxide tautening dope approximately 0.5 % mass 7 Application A.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 8 0% R H , w i t h thinners to Def. Stan. 80-38 used.
15、c) Annex E. Visual examination, normal corrected vision The film shall be smooth and continuous and free from blushing or other defects.BS 2X 26:2001 BSI 03-2001 5 Table 2 Tests on tautening dopes (concluded) Test Test panel, preparation and paint system Conditions Test method Requirement 8 Colour A
16、.1.1, A.2.1.2 24 hours after application under diffuse daylight BS 3900-D1 Shall match the colour of the appropriate standard in BS 381C, as specified by the purchaser. 9G l o s s A.1.1, A.2.1.2 24 hours after application using a 60 glossmeter BS3900-D5 Matt finish 5.0 units. 10 Tautness A.1.1, A.2.
17、1.3 Not 2 hours after application Annex B The ratio of tautness to the weight of dope shall be within the limits given below: Scheme Ratio Min. Max. No. 751 1.0 1.4 No. 752 1.4 1.8 No. 753 1.4 1.8 11 Resistance to high temperatures A.1.1, A.2.1.2 After application, allow to dry to constant tautness
18、with both surfaces of fabric freely exposed to the air Annex C No sign of cracking 12 Resistance to natural weathering A.1.1 without the plywood, A.2.1.2, A.2.3 24 hours after application of the final coat Annex D No cracking, chipping, flaking or blistering of the film, nor shall there be more than
19、 a slight change in colour and in the case of glossy finish, slight loss of gloss. Slight chalking 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 strengt
20、h of the undoped fabric. a The reference value is that which is established during type approval unless otherwise agreed between manufacturer and purchaser.BS 2X 26:2001 6 BSI 03-2001 Table 3 Tests on non-tautening finishes Test Test panel, preparation and paint system Conditions Test method Require
21、ment 1 Condition Component in the original or laboratory container BS 3900-A2 The material shall be free from extraneous matter and shall show no objectionable separation, settling or other defect 2 VOC When prepared for use ASTM D3960 reference value a 3 Shelf life After 12 months at (0 to 30) C. C
22、omponent in the original container Table 3 tests 1, 4, 6 and 9 Shall meet the requirements specified After 6 months in a tropical climate as defined in BS 3900-F6 4 Non-volatile matter Component in the original or laboratory container BS 3900-B18 Aluminium non-tautening 15.5 % mass Transparent non-t
23、autening 16.0 % mass 5A l u m i n i u m content Component in the original or laboratory container e.g. centrifuging or filtration Aluminium non-tautening finish 2.5 % mass 6 Application A.1.1, A.2.2.2 Single coat. Film allowed to dry under: a) conditions specified in BS EN 23270. b) (30 2) C and 80
24、% 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. 7 Colour A.1.2, A.2.2.2 24 hours after application, under diffuse daylight BS 3900-D1 The colour
25、shall match the appropriate standard in BS 381C, as specified by the purchaser. 8G l o s s A.1.2, A.2.2.2 24 hours after application using 60 glossmeter BS3900-D5 Matt finish 5.0 units. 9T a u t n e s s retention on application of non-tautening finishes A.1.1, A.2.2.3 24 hours after application Anne
26、x B The non-tautening finish shall not reduce the tautness of the system by more than 20 % compared with tautness values determined before application.BS 2X 26:2001 BSI 03-2001 7 Table 3 Tests on non-tautening finishes (concluded) Test Test panel, preparation and paint system Conditions Test method
27、Requirement 10 Resistance to high temperatures A.1.1, A.2.2.3 After application, allow to dry to constant tautness with both surfaces of fabric freely exposed to the air. Annex C No sign of cracking 11 Resistance to natural weathering A.1.1 without plywood, A.2.2.3, A.2.3 24 hours after application
28、of the final coat Annex D No 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 chalking 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 approval unless otherwise agreed between manufacturer and purchaser.
