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1、BRITISH STANDARD AEROSPACE SERIES BS X 35:1998 Specification for Selectively removable intermediate coating for aerospace purposes ICS 49.040 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:51:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS X 35:1998 This Br
2、itish Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 April 1998 BSI 04-1999 The following BSI references relate to the work on this standard: Committee reference ACE/44 Draft for
3、 comment 95/704054 DC ISBN 0 580 27991 X Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/44, Protective treatments and aircraft finishes, upon which the following bodies were represented: British Coatings Federation L
4、td. Metal Finishing Association Ministry of Defence National Centre of Tribology Oil and Colour Chemists Association Society of British Aerospace Companies Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 0
5、2:51:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS X 35:1998 BSI 04-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Normative references1 3Definitions1 4Materials1 5Performance1 6Batch inspection4 7Marking4 Annex A (normative) Type approval5 Annex B (normative) Pr
6、eparation of test panels5 Annex C (normative) Method for determination of ability to selectively remove5 Annex D (normative) Method for determination of ability to restore the paint scheme after selective removal5 Table 1 Tests on liquid paint: intermediate coat2 Table 2 Tests on liquid paint: paint
7、 scheme2 Table 3 Tests on the dry film3 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:51:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS X 35:1998 ii BSI 04-1999 Foreword This British Standard has been prepared by Techni
8、cal Committee ACE/44 and is one of a series for paints and varnishes suitable for aerospace purposes. It specifies requirements for an intermediate paint coating used as part of a scheme including a primer and finish. It has been assumed in the drafting of this British Standard that execution of its
9、 provisions is entrusted to appropriately qualified and experienced people. The quality assurance authority and approving authority referred to in this British Standard are as stated in the contract or order, or the accredited representative of the authority stated, as instructed by the purchaser. W
10、ARNING. This British Standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. A British St
11、andard 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 document comprises a front cove
12、r, an inside front cover, pages i and ii, pages 1 to 6, 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. Licensed Copy: London South Bank Unive
13、rsity, London South Bank University, Sat Dec 09 02:51:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS X 35:1998 BSI 04-19991 1 Scope This British Standard specifies requirements for two types of intermediate coating, type A and type B, which when incorporated in a paint scheme between primer and fi
14、nish, allow selective removal of the finish using a defined paint remover. The paint scheme, including the intermediate coating, is intended for application to metallic and non-metallic surfaces for aerospace purposes, to provide equivalent protection against corrosion and mechanical damage, and res
15、istance to aircraft fluids, to that provided by a paint scheme consisting of primer and finish alone. Type A intermediate coating is intended to function with a finish conforming to type A of BS X 34, where maximum resistance to fluid attack is required. Type B intermediate coating is intended to fu
16、nction with a finish conforming to type B of BS X 34, offering increased tolerance to flexing compared with type A finish. Annex A gives information on application for type approval. 2 Normative references This British Standard incorporates, by dated or undated reference, provisions from other publi
17、cations. These normative references are made at the appropriate places in the text and the cited publications are listed on the inside back cover. For dated references, only the edition cited applies; any subsequent amendments to or revisions of the cited publication apply to this British Standard o
18、nly when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. 3 Definitions For the purposes of this British Standard the definitions given in BS 2015 apply. 4 Materials 4.1 Composition NOTE
19、The composition of the intermediate coat is not defined. If a curing agent is included in the intermediate coating it shall be mixed in simple proportions by volume and thinned as necessary with the appropriate thinners as recommended by the manufacturer. 4.2 Scheme components 4.2.1 General Componen
20、ts used in tests on the intermediate coating as part of a paint scheme shall conform to 4.2.2 to 4.2.4. If required, paint remover shall conform to 4.2.5. 4.2.2 Primer The primer shall conform to type B of BS X 33 unless otherwise specified. 4.2.3 Intermediate coating The intermediate coating shall
21、conform to this British Standard. 4.2.4 Finish The finish shall conform to type A or type B of BS X 34 unless otherwise specified. 4.2.5 Paint remover The paint remover shall conform to the reference formulation specified in BS X 36 unless otherwise specified. NOTEThe performance of a scheme includi
22、ng components otherwise specified may be suitable but should be separately assessed. 5 Performance 5.1 General 5.1.1 The test panels shall be prepared and coated as described in Annex B. 5.1.2 Unless otherwise specified, all tests shall be carried out in temperature and relative humidity conditions
23、conforming to BS EN 23270. 5.2 Tests on liquid paint: intermediate coating The intermediate coating shall conform to Table 1. 5.3 Tests on liquid paint: paint scheme The paint scheme, comprising primer, intermediate coating and finish, prepared in accordance with Annex B, shall conform to Table 2. 5
24、.4 Tests on the dry film: paint scheme The dry film of the paint scheme, comprising primer, intermediate coating and finish, prepared in accordance with Annex B, shall conform to Table 3. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:51:09 GMT+00:00 2006, U
25、ncontrolled Copy, (c) BSI BS X 35:1998 2 BSI 04-1999 Table 1 Tests on liquid paint: intermediate coating Table 2 Tests on liquid paint: paint scheme TestTest panel, preparation and paint system ConditionsTest methodRequirement 1) ConditionComponents in their original or laboratory containers BS EN I
26、SO 1513Shall be free from extraneous matter and shall show no skinning, gelling, hard settlement or other defect that may prevent satisfactory application of a defect-free film. 2) Volatile organic compound (VOC) content When prepared for application as specified in B.3.1 ASTM-D 3960 1Shall be less
27、than or equal to the reference value.a 3) Shelf lifeAfter 12 months at 5 C to 35 C, components in their original containers Tests 1), 5) and 6) of this table Shall conform to the requirements 4) Pot life4 h after preparation of a 200 ml sample as specified in B.3.1 BS EN ISO 2431Viscosity shall not
28、increase by more than a factor of two from the initial value, unless otherwise specified by the purchaser. 5) ApplicationB.1.1 (300 mm 100 mm test panel), B.1.3 and B.3 (without primer) 24 h after application Visual examination with normal corrected vision Paint film shall show an opaque even finish
29、, free from runs, sags, wrinkling, pin-holing or other defect. 6) Drying timeB.1.1, B.1.3 and B.3 (without primer) After application BS EN 29117:1992 Paint film shall be through-dry at # 6 h from application, unless otherwise specified by the purchaser. a The reference value shall be established dur
30、ing type approval unless agreed otherwise between manufacturer and purchaser (see Annex A). TestTest panel, preparation and paint system ConditionsTest methodRequirement 1) Application B.1.1 (300 mm 100 m m test panel), B.1.3 and B.4 24 h after application Visual examination with normal corrected vi
31、sion Paint film shall show an opaque even finish, free from runs, sags, wrinkling, pin-holing or other defect. 2) Drying time B.1.1, B.1.3 and B.4After application BS EN 29117Paint film shall be through-dry at # 6 h from application, unless otherwise specified by the purchaser. Licensed Copy: London
32、 South Bank University, London South Bank University, Sat Dec 09 02:51:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS X 35:1998 BSI 04-19993 Table 3 Tests on the dry film TestTest panel, preparation and paint system ConditionsTest methodRequirement 1) ColourB.1.1, B.1.3 and B.324 h after applicati
33、on, under diffuse daylight BS 3900-D1Shall match the colour specified by the purchaser 2) Specular gloss B.1.1, B.1.3 and B.424 h after application, using a 60 glossmeter BS 3900-D5Shall be as follows: high gloss: 85 units or above; semi matt: (15 3) units; matt: less than or equal to 5 units. 3) Fl
34、exibility (cupping test) B.1.1, B.1.3 and B.4BS EN ISO 1520 ( 10 magnification) Type B: there shall be no cracking at an indentation depth of 4 mm. 4) Flexibility (impact) B.1.1, B.1.2 and B.4BS EN ISO 6272 (coating downwards) Type B: there shall be no cracking at an indentation depth of 3.8 mm. 5)
35、Adhesion (crosshatch) B.1.1, B.1.3 and B.4BS 3900-E6, 1 mm spacing # class 1 6) Hardness (scratch) B.1.1, B.1.3 and B.4BS 3900-E2There shall be no penetration of the needle to the intermediate coat under a load of 1 500 g. 7) Water resistance B.1.1, B.1.3 and B.4Immerse for 168 h at (40 2) C in wate
36、r conforming to at least grade 3 of BS EN ISO 3696 a) Method 1, procedure A of BS 3900-G5 # 2 min after removal shall show no blistering or other film defects. b) BS 3900-E6, 1 mm spacing # 2 min after removal, the adhesion shall be # class 1. c) BS 3900-E2# 2 min after removal shall show no penetra
37、tion of a needle to the intermediate coat under a load of 1 500 g. 8) Hydraulic fluid resistance B.1.1, B.1.2 and B.4Cut paint film through to substrate down middle of panel; immerse at (70 2) C in tri-n-butylphosphate; type A: 1 000 h; type B: 168 h a) Method 1, procedure A of BS 3900-G5 # 1 h afte
38、r removal shall show no blistering or other film defects. b) BS 3900-E2; scratch (10 2) mm parallel to cut # 1 h after removal shall show no penetration of the needle to the intermediate coat under the following load: type A: 1 200 g; type B: 1 000 g. Licensed Copy: London South Bank University, Lon
39、don South Bank University, Sat Dec 09 02:51:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS X 35:1998 4 BSI 04-1999 Table 3 Tests on the dry film 6 Batch inspection Before despatch, a representative sample of each batch of material, taken in accordance with BS EN 21512, shall be tested to confirm c
40、onformity to tests 1, 4, 5 and 6 of Table 1, and, when prepared in accordance with Annex B, the scheme shall conform to tests 1, 2, 4 and 6 of Table 3. NOTESamples of material and material ingredients may be inspected at any stage of manufacture, and from any portion of the batch. 7 Marking In addit
41、ion to any statutory requirements each container shall be legibly and durably marked with at least the following: a) a description of the material; b) the number and date of this British Standard, i.e. BS X 35:1998; c) the type of material, i.e. type A or type B; d) the colour (with the colour stand
42、ard if appropriate); e) the manufacturers name and recognized trade mark; f) the batch number; g) the date of manufacture; h) mixing and thinning instructions. TestTest panel, preparation and paint system ConditionsTest methodRequirement 9) Artificial weathering B.1.1, B.1.3 and B.4 BS 3900-F16,meth
43、od A. Lamps: UV-B (313); total duration 500 h a) BS EN ISO 1520Type B: there shall be no cracking at an indentation depth of 4 mm. b) BS 3900-D5High gloss and semi matt: gloss reduction shall be # 20 % of initial value. c) BS 3900-D8, BS 3900-D9 and BS 3900-D10 %E*ab# 2.0 10) Selective removal B.1.1
44、, B.1.2 and B.4 After 96 h at (70 2) CAnnex CFinish or finish and intermediate coating shall be removable at # 2 h without permanent damage to remaining coating. 11) Scheme restoration a) B.1.1, B.1.2 and B.4 BS 3900-F16, method A. Lamps: UV-B (313); total duration 500 h Annex CFinish or finish and
45、intermediate coating shall be removable at # 2 h without permanent damage to remaining coating. b) Annex CTests 1) and 2) of Table 2; tests 1) to 10) of this table Shall conform to the requirements. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:51:09 GMT+00
46、:00 2006, Uncontrolled Copy, (c) BSI BS X 35:1998 BSI 04-19995 Annex A (normative) Type approval A.1 If the manufacturer is required to prove product conformity to this British Standard, the following shall be provided: a) test results conforming to this British Standard; b) wet samples of all mater
47、ials; c) a declaration of composition, including the percentage and nature of all ingredients; d) reference values if required, e.g. VOC content. A.2 After type approval has been granted, there shall be no change in the product formulation unless this is approved by the approving authority. Annex B
48、(normative) Preparation of test panels B.1 Preparation of substrate B.1.1 Use test panels made from unabraded aluminium sheet conforming to BS L 163, and measuring approximately 150 mm 100 mm and 0.8 mm thick. B.1.2 Where specified (see Table 1, Table 2 and Table 3), pickle the panels in accordance
49、with BS EN 2334. B.1.3 Where specified (see Table 1, Table 2 and Table 3), detergent degrease the panels as follows. Remove protective oil or grease either by vapour degreasing or solvent washing in accordance with BS EN ISO 1514. Allow to dry and immerse in a 10 % aqueous solution of aircraft cleaning detergent conforming to DEF STAN 79-17 2 for 15 min. Remove and wash with running tap water for 1 min. Check that a water break-free surface is obtained. Rinse with water conforming to at least grade 3 of BS EN ISO 369