1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirelyvoluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefro
2、m, is the sole responsibility of the user.”SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.Copyright 2001 Society of Automotive Engineers, Inc.All rights reserved. Printed in U.S.
3、A.QUESTIONS REGARDING THIS DOCUMENT: (724) 772-7161 FAX: (724) 776-0243TO PLACE A DOCUMENT ORDER: (724) 776-4970 FAX: (724) 776-0790SAE WEB ADDRESS: http:/www.sae.org400 Commonwealth Drive, Warrendale, PA 15096-0001AEROSPACE MATERIAL SPECIFICATIONAMS-C-83445AIssued SEP 1999 Revised OCT 2001Supersedi
4、ng AMS-C-83445Coating System, Polyurethane, Nonyellowing, White,Rain Erosion Resistant, Thermally Reflective1. SCOPE:1.1 Form: This specification covers the requirements for one type of thermally reflective non-yellowing white rain erosion resistant polyurethane coating system. 1.2 Application: Thes
5、e products have been used typically for protecting glass fabric reinforced plastic laminates and other plastic parts used for exterior surfaces of aircraft and missiles, but usage is not limited to such applications. (See 8.1)1.3 Safety-Hazardous Materials: While the materials, methods, applications
6、, and processes described or referenced in this specification may involve the use of hazardous materials, this specification does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous m
7、aterials and to take necessary precautionary measures to ensure the health and safety of all personnel involved.2. APPLICABLE DOCUMENTS: The issue of the following documents in effect on the date of the purchase order form a part of this specification to the extent specified herein. The supplier may
8、 work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding document has been specified, the last published issue of that document shall apply.AMS-C-83445A SAE AMS-C-83445A- 2 -2.1 SAE Publications: Av
9、ailable from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AS5505 Requirements for Accreditation of Testing Laboratories for Organic CoatingsAS9100 Quality Systems - Aerospace - Model for Quality Assurance in Design, Development, Production, Installation and ServicingPD2000 Procedures for a
10、n Industry Qualified Product Management Process2.2 ASTM Publications: Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.ASTM D 471 Rubber Property - Effect of LiquidsASTM D 4420 Aromatics in Finished Gasoline by Gas Chromatography2.3 U.S. Government Publications: Available
11、 from DODSSP Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.MIL-PRF-5425 Plastic Sheet, Acrylic, Heat ResistantMIL-R-7705 Radome, General Specification for (Canceled, no superseding document)MIL-A-8625 Anodic Coatings, for Aluminum and Aluminum Alloys MIL-PR
12、F-25134 Remover, Paint and Lacquer, Solvent TypeMIL-P-25421 Plastic Materials, Glass Fiber Based-Epoxy Resin Low Pressure LaminatedFederal Test Method Std. 141 Paint, Varnish, Lacquer, and Related Materials; Methods of Inspection, Sampling and Testing3. REQUIREMENTS: 3.1 Qualification: 3.1.1 All pro
13、ducts sold to this specification shall be listed, or approved for listing on the qualified products list. PRI QPL AMS-C-83445. To qualify, the product shall meet the tests specified in section 4.4.3.1.2 Qualification testing, review of test results, approval, reapproval and recertification of qualif
14、ication for QPL listing shall be in accordance with PD2000.AMS-C-83445A SAE AMS-C-83445A- 3 -3.1.3 Recertification of qualification is required every five years. Recertification consists of a letter certifying that there have been no changes in the material ingredients, manufacturing processes, or s
15、ite of production since qualification and that the product meets all of the requirements of this specification. In addition a test report shall be provided from a lab of the manufacturers choosing, showing compliance with all of the qualification tests.3.2 Materials: 3.2.1 The coating materials shal
16、l be either an aliphatic or cycloaliphatic isocyanate polyurethane prepolymer and shall be a chemically curing composition of such ingredients to produce high quality non-yellowing rain erosion resistant coatings. The mix ratio of components, if applicable, shall be as specified by the manufacturer.
17、3.2.2 The materials shall have no adverse effect on the health of personnel when used for their intended purposes with adequate environmental controls and safety equipment. Questions pertinent to this effect shall be referred by the procuring activity to the appropriate department medical service wh
18、o will act as an advisor to the procuring agency.3.3 Components: Unless otherwise specified, the coating system shall consist of the following: primer plus activator; non-yellowing aliphatic or cycloaliphatic isocyanate polyurethane prepolymer solution, which may be moisture curable and accelerated
19、by a catalyst, or may be reacted with a curing agent; and a diluent solvent to be used in the application of the coating. Coatings shall be applied by brush or spray techniques. 3.4 Quantitative Requirements: The quantitative requirements of the coatings shall be as specified in Table 1.AMS-C-83445A
20、 SAE AMS-C-83445A- 4 -3.4.1 Free Aliphatic Isocyanates: The free aliphatic isocyanate content of either the mixed components or single component moisture cure coating systems shall be not greater than 1%. When the prepolymer contains an aliphatic isocyanate, the free isocyanate content shall be dete
21、rmined by a test method approved by the issuing activity.3.4.2 Free Cycloaliphatic Isocyanate: The free cycloaliphatic isocyanate content of either the mixed components or single component moisture cure coating systems shall not be greater than 1%. When the prepolymer contains cycloaliphatic methyle
22、ne bis (4-cyclohexylene isocyanate), the free isocyanate content shall be determined in accordance with Appendix. When the prepolymer is based on any cycloaliphatic isocyanate other than methylene bis (4-cyclohexylene isocyanate), the issuing activity shall be consulted for appropriate analytical pr
23、ocedures for determination of free isocyanate.3.5 Component Requirements: 3.5.1 Mixing: Components shall be individually mixed in accordance with the manufacturers instructions. The resulting individual mixtures shall be smooth, homogeneous materials free from lumps, gelling, seeding, separation or
24、other objectionable characteristics.3.5.2 Odor: The odor of the wet coatings shall not be obnoxious when tested as specified in 4.9.3.5.3 Color: Base coatings and/or topcoatings shall be pigmented white. The color shall be sufficiently intense to completely hide the surface and provide the thermal r
25、eflectance properties specified herein.TABLE 1 - Quantative RequirementsMaterialNonvolatileSolids Content,Percent byWeight, minDensity, kg/l(lb/gal), min Viscosity, CentipoisesFlash PointC (F), minPrimer (Mixedcomponents, ifapplicable)10.0 0.839 (7.0) 50 to 250 21 (70)Aliphatic andcycloaliphaticpoly
26、urethaneprepolymer45 0.959 (8.0) 100 to 800 10 (50)AMS-C-83445A SAE AMS-C-83445A- 5 -3.5.4 Accelerated Storage Stability: Coating shall be subjected to 4 days of accelerated storage in accordance with 4.9.6. At the end of the 4-day storage period the component materials shall be free of lumps, skins
27、 and gels, and shall disperse readily to a smooth homogeneous mixture.3.5.5 Storage Stability: The previously unopened packaged components, including the primer and primer accelerator, shall meet all the requirements specified herein after a storage period of one year, provided that the daily mean t
28、emperature of the ambient conditions at the storage locations falls within the range of 70 to 100 F (21 to 38 C) (see 4.9.7).3.5.6 Pot Life: Base coating and topcoating solutions shall have a minimum pot life of4 hours after catalyzation. At the end of the 4-hour period, the coatings shall show no s
29、igns of lumping, seeding, separation, or an increase in viscosity of more than 20% from the initial viscosity when tested in accordance with 4.9.8 and Table 1.3.5.7 Application and Drying Time: The coatings shall be applied in accordance with the manufacturers instructions to a total dry film thickn
30、ess of 0.31 to 0.36 mm (0.012 to 0.014 inch) (12 to 14 mils). The total application time, including intervals between coatings shall not exceed 8 hours and the tack free drying time shall not exceed 10 hours after final application of the coatings when tested in accordance with 4.9.9.3.5.7.1 Rate-of
31、-Cure: The coatings shall have a maximum set-to-touch or recoat time of one hour. The manufacturer shall furnish instructions for catalyzing or accelerating the polyurethane base materials for a temperature range from 65 to 95 F (18 to 35 C) and a relative humidity range from 40 to 75%.3.5.8 Peel St
32、rength: Coatings shall have a peel strength of not less than 1050 N/m(6 pounds per inch) when tested in accordance with 4.9.10.3.5.9 Flexibility: A film of the coating shall show no cracking or loss of adhesion in the bend area when tested in accordance with 4.9.13.3.5.10 Fluid Immersion Resistance:
33、 When tested as specified in 4.9.11 and 4.9.12, panels prepared in accordance with 4.6 and coated in accordance with 4.7.1 and exposed to fluids as specified below shall show no pigment leaching, loss of adhesion, blistering or discoloration. Panels shall be inspected immediately upon removal from t
34、he test fluid for any observable defects. The exposed panels shall then be cleaned and all specified tests performed within an hour after removal from the test fluids. Cleaning of the panels shall be by wiping with lint free paper toweling or with lint free cloth.a. Distilled Water Resistance: Disti
35、lled water at ambient conditions (24 C 1) for 24 hours.b. Hydrocarbon Resistance: ASTM D 471 Ref. Fuel B for 1 hour at standard conditions.3.5.11 Rain Erosion Resistance: Coatings shall have a minimum average erosion resistance of 100 minutes when tested as specified in 4.9.14.AMS-C-83445A SAE AMS-C
36、-83445A- 6 -3.5.12 Electrical Transmission: Coatings shall have a minimum electrical transmission of 90 or 95%, when tested as specified in 4.9.16.3.5.13 Thermal Reflectivity: The coating shall be exposed to a total fluence of 60 at flux rate of30 cal/cm2-sec without burning or charring when tested
37、in accordance with 4.9.20. Discoloration is permitted.3.5.14 Weather Resistance: Coatings, when exposed to outdoor weathering for 6 months, shall show no film deterioration such as checking, chalking, cracking, embrittlement, loss of adhesion or loss of resiliency. After weathering, the coatings sha
38、ll meet the erosion resistance requirements as specified in Table 2.3.5.15 Strippability: Newly applied, fully cured and weathered coatings shall be completely removed when tested in accordance with 4.9.19.3.5.16 Repairability: The cured coatings shall be repairable by the same procedure specified b
39、y the manufacturer for original application.TABLE 2 - Rain Erosion Resistance and Electrical Transmission RequirementsPropertyAfter Dryingand Normal 5Day CureAfter Normal Cureand Aging 7 Days at95% RH and 38 C 2(100 F 2)After Normal Cureand Aging 24 Hoursat 108 C 2(225 F 5)After Normal Cureand 6 Mon
40、thsExteriorWeatheringRain erosion resistance(erosion through0.31 to 0.36 mm(0.012 to 0.014 inch)of erosion coating at805 km/h (500 mi/hour)and 25.4 mm/hour(1 inch/hour) rainfall, time in minutes, minimum) 100 100 100 100Electrical transmission 1/ 95 90 - 95Uncoated control panel 87 84 - 871/ The per
41、centage of electrical transmission of a coating is equal to 100 times the electrical transmission of the coated panel divided by the electrical transmission of the uncoated panel.AMS-C-83445A SAE AMS-C-83445A- 7 -3.5.17 Age: The age of the coatings shall be not more than 12 months from the date of m
42、anufacture to the date of use.4. QUALITY ASSURANCE PROVISIONS: 4.1 Quality System of Manufacturer: Before submitting a product for qualification to this specification for the purpose of being listed on the PRI-QPL, the manufacturer must have a quality system in place which holds a third party accred
43、itation to AS9100.4.2 Responsibility for Inspection: The manufacturer of the coating material shall supply all samples and shall be responsible for required tests. Purchaser reserves the right to sample and perform any confirmatory testing deemed necessary to ensure that the coating material conform
44、s to the requirements of this specification.4.3 Classification of Inspections: The inspection requirements specified herein are classified as follows:a. Qualification inspection (see 4.4).b. Quality conformance inspection (see 4.5).4.4 Qualification Inspection: Qualification tests shall consist of a
45、ll of the tests specified in 4.9 except the test for inspection of filled containers. All qualification testing is to be done by a laboratory accredited to ISO 17025 and AS5505.4.4.1 Qualification Samples: Unless otherwise specified, qualification test samples shall consist of the following material
46、s and test panels:a. MaterialsPrimer 0.5 L (1 pint) (for each class)Primer activator Quantity specified by manufacturerPolyurethane prepolymer 3.8 L (1 gallon) (for each class)solutionsCatalyst Quantity specified by manufacturerDiluent 1.9 L (2 quarts) minimum (for each class). Solvent must be ureth
47、ane grade.AMS-C-83445A SAE AMS-C-83445A- 8 -4.4.1 (Continued):b. Test panelsUncoated airfoils 18 (for each class)(see 4.9.14)Coated void-free laminate 2 (for each class)panels (see 4.9.16)Uncoated void-free control 1panels (see 4.9.16)Coated void-free panels 1 (for each class)(see 4.9.20)Samples sha
48、ll be identified as follows, and forwarded to the activity responsible for testing.AMS-C-83445A, Coating System, Polyurethane, Nonyellowing, White, Rain Erosion Resistant,Thermally ReflectiveManufacturers IdentificationName of ManufacturerLot NumberDate of ManufactureSubmitted by (name) (date) for q
49、ualification tests in accordance with AMS-C-83445 underauthorization (Reference Authorizing Letter)Mixing Instructions.4.4.2 Test Report: Qualification samples shall be accompanied by a certified test report showing results of all tests required by this specification except the test for inspection of filled containers.4.4.3 Instruction Sheet: The manufacturer shall forward three copies of the instruction sheet detailing mixing, thinning, application and curing procedures for his material with all qualification samples submitted for approval. Qualification
