1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58ICS 49.040Specification for two component primer for aerospace purposesBRITISH STANDARD AEROSPACE S
2、ERIESBS 2X 33:1998Incorporating Amendment No. 1BS 2X 33:1998This British 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 28 November 2005First published 28 June 199
3、1Second edition April 1998The following BSI references relate to the work on this standard:Committee reference ACE/44Draft for comment 96/705059 DCISBN 0 580 27980 4Ministry of DefenceNational Centre of TribologyOil and Colour Chemists AssociationSociety of British Aerospace CompaniesAmendments issu
4、ed since publicationAmd. No. Date Comments15983 28 November 2005 See ForewordCommittees responsible for this British StandardThe preparation of this British Standard was entrusted to Technical Committee ACE/44, Protective treatments and aircraft finishes, upon which the following bodies were represe
5、nted:British Coatings Federation Ltd.Metal Finishing AssociationBS 2X 33:1998 BSI 28 November 2005ContentsPageCommittees responsible Inside front coverForeword ii1Scope 12 Normative references 13 Definitions 14 Materials 15 Performance 26Batch inspection 27 Marking 2Annex A (normative) Type approval
6、 6Annex B (normative) Preparation of test panels 6List of references 7Table 1 Tests on liquid paint 3Table 2 Tests on the dry film 4iBS 2X 33:1998iione of a series for paints and varnishes suitable for aerospace purposes. It covers two types of cold curing !Text deleted“ primer. This British Standar
7、d supersedes BS X 33:1991 which has been withdrawn. During its preparation the layout has been aligned with other BS X series standards and all references have been revised.The start and finish of text introduced or altered by amendment is indicated in the text by tags !“. Tags indicating changes to
8、 the text carry the number of the amendment. For example, text altered by amendment 1:2005 is indicated by !“.It has been assumed in the drafting of this British Standard that execution of its provisions is entrusted to appropriately qualified and experienced people.The quality assurance authority a
9、nd 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.WARNING. This British Standard calls for the use of substances and/or procedures that may be injurious to healt
10、h 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.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its corr
11、ect application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 7 and a back cover.The BSI copyright notice displayed in this document indicates when
12、the document was last issued.ForewordThis British Standard has been prepared by Technical Committee ACE/44 and is BSI 28 November 2005BS 2X 33:19981 ScopeThis British Standard specifies requirements for the materials and performance of two types of strontium chromate pigmented two pack !“ resin base
13、d primer, for air-drying at ambient temperature, for aerospace applications.Type A materials are intended for application to chemically pretreated substrates (e.g. by a chromate conversion process) suitable for general applications. Type B materials are similar to type A but with improved tolerance
14、to the standard of surface preparation, and with increased chemical resistance. The primers are for use on metallic substrates as an anti-corrosive coating on interior surfaces, or, when overcoated with a compatible finish, as a protective and decorative finishing scheme for exterior surfaces.Inform
15、ation on application for type approval is provided in Annex A.2 Normative referencesThis British Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are made at the appropriate places in the text and the cited publications are listed o
16、n page 7. For dated references, only the edition cited applies; any subsequent amendments to or revisions of the cited publication apply to this British Standard only when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication appl
17、ies, together with any amendments.3 DefinitionsFor the purposes of this British Standard the definitions given in BS 2015 apply.4 Materials4.1 Composition4.1.1 !The primer shall consist of a pigmented resin base and a curing agent.“ The base and curing agent shall be mixed in simple proportions by v
18、olume and thinned as necessary with the appropriate thinners as recommended by the manufacturer.4.1.2 The pigment of the primer shall consist essentially of strontium chromate, opacifying pigments and extenders.4.1.3 The strontium chromate shall conform to BS 4313 and shall comprise not less than 15
19、 % (m/m) of dried film.4.2 Scheme components4.2.1 GeneralComponents used in tests on the primer as part of a paint scheme shall conform to 4.2.2 and 4.2.3.4.2.2 PrimerThe primer shall conform to this British Standard.4.2.3 FinishThe finish shall conform to type A or type B of BS X 34 unless otherwis
20、e specified.NOTE The performance of a scheme including components otherwise specified may be suitable but should be separately assessed. BSI 28 November 20051BS 2X 33:19985 Performance5.1 General5.1.1 The test panels shall be prepared and coated as specified in Annex B.5.1.2 Unless otherwise specifi
21、ed, all tests shall be carried out in temperature and relative humidity conditions conforming to BS EN 23270.5.2 Tests on liquid paintThe primer shall conform to Table 1.5.3 Tests on the dry filmThe dry paint film, prepared in accordance with Annex B, shall conform to Table 2.6 Batch inspectionBefor
22、e despatch, a representative sample of each batch of material, taken in accordance with BS EN 21512, shall be tested to confirm conformity 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 5 of Table 2.NOTE Samples of mate
23、rial and material ingredients may be inspected at any stage of manufacture, and from any portion of the batch, by the quality assurance authority.7 MarkingIn addition to any statutory requirements each container shall be legibly and durably marked with at least the following:a) a description of the
24、material;b) the number and date of this British Standard, i.e. BS 2X 33:1998;c) the type of material, i.e. type A or type B; d) the colour (with the colour standard if appropriate);e) the manufacturers name and recognized trade mark;f) the batch number;g) the date of manufacture;h) mixing and thinni
25、ng instructions.2 BSI 28 November 2005BS 2X 33:1998Table 1 Tests on liquid paintTest Test panel, preparation and paint systemConditions Test method Requirement1) Condition Components in their original or laboratory containersBS EN ISO 1513 Shall be free from extraneous matter and shall show no skinn
26、ing, 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.2.1!Process Guidance Note PG6/40“ 1Shall be less than or equal to the reference value1).3) Shelf li
27、fe After 12 months at 5 C to 35 C, components in their original containersTests 1), 5) and 6) of this tableShall conform to the requirements.4) Pot life !4 h unless otherwise agreed between manufacturer and purchaser“BS EN ISO 2431 Viscosity shall not increase by more than a factor of two from the i
28、nitial value, unless otherwise specified by the purchaser.5) Application B.1.1, B.1.3 and B.224 h after applicationVisual examination with normal corrected visionPaint film shall show an opaque even finish, free from runs, sags, wrinkling, pin-holing or other defect.6) Drying time B.1.1, B.1.3 and B
29、.2After application BS EN 29117 Paint film shall be through-dry at k 4 h from application, unless otherwise specified by the purchaser.1)The reference value shall be established during type approval unless agreed otherwise between manufacturer and purchaser (see annex A). BSI 28 November 20053BS 2X
30、33:1998Table 2 Tests on the dry filmTest Test panel, preparation and paint systemConditions Test method Requirement1) Colour B.1.1, B.1.4 and B.224 h after application, under diffuse daylightBS 3900: Part Dl Shall be yellow1).2) Specular gloss B.1.1, B.1.4 and B.224 h after application, using a 60 g
31、lossmeterBS 3900: Part D5 Shall be k20 units1).3) Water resistance B.1.1, B.1.3 and B.2a) Type A: After 7 d air drying, immerse for 24 h at (40 2) C in water conforming to at least grade 3 of BS EN ISO 3696Method 1, procedure A of BS 3900: Part G5k2 min after removal shall show no blistering or othe
32、r film defects.BS 3900: Part E2 k2 min after removal shall show no penetration of the needle to the substrate under a load of 1 200 g.B.1.1, B.1.4 and B.2b) Type B: After 7 d air drying, immerse for 24 h at (40 2) C in water conforming to at least grade 3 of BS EN ISO 3696Method 1, procedure A of BS
33、 3900: Part G5k2 min after removal shall show no blistering or other film defects.BS 3900: Part E2 k2 min after removal shall show no penetration of the needle to the substrate under a load of 1 200 g.4) Flexibility (cupping test)B.1.1, B.1.3 and B.2After 7 d air drying BS EN ISO 1520 ( 10 magnifica
34、tion)There shall be no cracking at an indentation depth of 4 mm5) Adhesion (cross hatch)B.1.1, B.1.3 and B.2Type A: After 7 d air dryingBS 3900: Part E6, 1 mm spacingShall conform to class 0.B.1.1, B.1.4 and B.2Type B: After 7 d air dryingBS 3900: Part E6, 1 mm spacingShall conform to class 0.1)Unle
35、ss otherwise specified by the purchaser.4 BSI 28 November 2005BS 2X 33:1998Table 2 Tests on dry film (continued)Test Test panel, preparation and paint systemConditions Test method Requirement6) Hydraulic fluid resistanceB.1.1, B.1.3 and B.2After 7 d air drying, cut paint film through to substrate do
36、wn middle of panel; immerse for 168 h at (70 2) C in tri-n-butylphosphateMethod 1, procedure A of BS 3900: Part G51 h after removal, shall show no blistering or other film defects.BS 3900: Part E2; scratch (10 2) mm parallel to cut1 h after removal shall show no penetration of the needle through to
37、substrate under a load of: type A: 1000 g; type B: 2000 g.!7) Corrosion resistance (alternate immersion)B.1.2, B.1.3 and B.3Test for 1 500 h at (35 2) CBS ISO 15710 ISO 4628 (part A)There shall be no blistering or other film defect across the face of the panel. Corrosion shall not be visible after 1
38、 000 h nor spread by more than 1 mm from the cut after 1 500 h on at least 2 panels out of 3. Final examination should be made within 1 h of completion of the test.“ BSI 28 November 20055BS 2X 33:1998Annex A (normative) Type approvalA.1 When the manufacturer is required to prove product conformity t
39、o this British Standard, the following shall be provided:a) test results conforming to this British Standard; b) wet samples of all materials;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 appro
40、val has been granted, there shall be no change in the product formulation unless this is approved by the approving authority.Annex B (normative) Preparation of test panelsB.1 Preparation of substrateB.1.1 Where specified (see Table 1 and Table 2), use test panels made from unabraded aluminium sheet
41、conforming to BS L 163:1978, and measuring approximately 150 mm 100 mm and 0.8 mm thick.B.1.2 !Where specified (see Table 1 and Table 2), use test panels made of unabraded aluminium sheet conforming to BS EN 2395, measuring approximately 100 mm 40 mm 2.0 mm min, and heat treated in accordance with B
42、S ISO 15710.“B.1.3 Where specified (see Table 1 and Table 2), acid chromate pickle the panels in accordance with BS EN 2334.B.1.4 Where specified (see Table 1 and Table 2), detergent degrease the panels as follows. Remove protective oil or grease either by vapour degreasing or solvent washing in acc
43、ordance with BS EN 605. 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 o
44、f BS EN ISO 3696, and allow to dry.B.2 Primer applicationB.2.1 Prepare the primer by mixing the base and curing agent in the proportions specified and thin as necessary with the appropriate thinners as recommended by the manufacturer.B.2.2 Spray the primer on the test panels prepared in accordance w
45、ith B.1, within 24 h of preparation, at a spreading rate sufficient to produce a single dry coat with a film thickness of (20 5) 4m, unless otherwise specified, and allow to dry vertically, with free air access, for the time specified for the tests in Table 1 and Table 2, unless otherwise specified.
46、B.3 Finish applicationB.3.1 Prepare the finish by mixing the base and curing agent in the proportions specified and thin as necessary with the appropriate thinners as recommended by the manufacturer.B.3.2 Spray the finish on the test panels primed in accordance with B.2, at a spreading rate sufficie
47、nt to produce a single dry coat with a film thickness of (40 5) 4m, unless otherwise specified, and allow to dry vertically with free air access for 7 d, unless otherwise specified.6 BSI 28 November 2005BS 2X 33:1998List of references (see Clause 2)Normative referencesBSI publicationsBRITISH STANDAR
48、DS INSTITUTION, LondonBS 2015:1992, Glossary of paint and related terms.BS 3900, Methods of test for paints.BS 3900: Group D, Optical tests on paint films.BS 3900: Part D1: 1978, Visual comparison of the colour of paints.BS 3900: Part D5: 1995, Measurement of specular gloss of non-metallic paint fil
49、ms at 20, 60 and 85.BS 3900: Group E, Mechanical tests on paint films. BS 3900: Part E2: 1992, Scratch test.BS 3900: Part E4: 1995, Cupping test.BS 3900: Part E6: 1992, Cross cut test.BS 3900: Group G, Environmental tests on paint films (including tests for resistance to corrosion and chemicals).BS 3900: Part G5: 1993, Determination of resistance to liquids General methods.BS 4313:1988, Specification for strontium chromate pigments for paints.BS L 163:1978, Specification for sheet
