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 entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising theref
2、rom, 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 2007 SAE International All rights reserved. No part of this publication ma
3、y be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA)
4、Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org AMS 3138D AEROSPACE MATERIAL SPECIFICATION Issued 1980-10 Revised 2007-12 Superseding AMS 3138C Coating Materials, Fluorocarbon (FKM) Elastomeric RATIONALE Revision C was issued in 1999 and a review was needed. There
5、was a desire to incorporate the slash sheets into the basic document. 1. SCOPE 1.1 Form This specification covers fluorocarbon (FKM) elastomeric coating materials for fiber-reinforced-resin composite structures in the form of two-component brushable or sprayable liquids. 1.2 Application These produc
6、ts have typically been used for protection of aircraft and missile radomes and other components from rain erosion, aerodynamic heating, precipitation static build-up, thermal flash exposure, and weathering, but usage is not limited to such applications. 1.3 Classification Coating materials covered b
7、y this specification are classified as follows (see 8.5): Type I Base coating Type II Antistatic topcoating Class 1 Black Class 2 White (with thermal-flash resistance) Class 3 Color-matched 1.4 Safety - Hazardous Materials While the materials, methods, applications, and processes described or refere
8、nced 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 materials and to take necessary prec
9、autionary measures to ensure the health and safety of all personnel involved. SAE AMS 3138D - 2 - 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the extent specified herein. The supplier may work to a sub
10、sequent 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. 2.1 SAE Publications Available from SAE International, 400 Commonwealth
11、 Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AMS 2825 Material Safety Data Sheets AMS 3609 Plastic Sheet, Methyl Methacrylate, Heat-Resistant AMS 3831 Cloth, Type “E” Glass, “B” Stage Epoxy-Resin-Impregnated, 7781 Style Fabr
12、ic, Flame Resistant, Improved Strength AMS 3844 Cloth, Type E-Glass, Style 7781 Fabric, Hot-Melt, Addition-Type, Polyimide Resin Impregnated AMS 3849 Cloth, Quartz, Style 581 Fabric, Hot-Melt, Addition-Type, Polyimide Resin Impregnated 2.2 ASTM Publications Available from ASTM International, 100 Bar
13、r Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM D 471 Rubber Property - Effects of Liquids ASTM D 1193 Reagent Water ASTM D 1296 Odor of Volatile Solvents and Diluents ASTM D 1475 Density of Paint, Varnish, Lacquer, and Related Products ASTM D 1
14、644 Nonvolatile Content of Varnishes ASTM D 1824 Apparent Viscosity of Plastisols and Organosols at Low Shear Rates by Brookfield Viscometer ASTM D 3960 Volatile Organic Compound (VOC) Content of Paint and Related Coatings 2.3 U. S. Government Publications Available from DODSSP, Subscription Service
15、s Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, or . FED-STD-595 Color 3. TECHNICAL REQUIREMENTS 3.1 Material Coating material shall be pigmented, chemically room-temperature-curing fluoroelastomeric compositions with appropriate curing agents, in kit form, formulated to meet t
16、he requirements of 3.2. 3.1.1 Toxicity and Air Quality Compliance Coating material shall have no adverse effect on the health of personnel when used for its intended purposes and applied in approved facilities with the use of approved safety equipment. Coating material shall also meet the requiremen
17、ts of the cognizant Air Quality Authority for the locality in which the coating material is applied. 3.1.2 Accelerated Storage Stability Coating material components, stored uncatalyzed for 4 days 0.1 at 50 C 1 (122 F 2) in an unopened original container, shall be free from lumps, skins, and gels, an
18、d shall disperse readily to smooth, homogeneous mixtures. SAE AMS 3138D - 3 - 3.1.3 Long-Term Storage Stability Coating material components shall meet the requirements of this specification after being stored for one year at 20 to 38 C (68 to 100 F) in an unopened original container. 3.1.4 Color Sha
19、ll be per the applicable Class, and of sufficient intensity to hide completely the surface of the substrate when applied at the specified coating thickness. Class 3 coatings shall be color-matched to the purchaser-specified FED-STD-595 color standard or purchaser supplied color standard, as applicab
20、le. 3.1.5 Primer A primer (for promoting adhesion) shall be used prior to application of the Type I coatings when recommended by the manufacturer. Coating material and primer shall meet requirements of this specification when used according to manufacturers instructions. 3.2 Properties The product s
21、hall conform to the following requirements: 3.2.1 Mixed, Uncured Coating Materials Shall meet the following requirements after mixing as in 4.5.1: 3.2.1.1 Nonvolatile Content Shall be greater than or equal to 10% by weight, determined in accordance with ASTM D 1644, Method A. 3.2.1.2 Weight Per Unit
22、 Volume Shall be greater than or equal to 7.6 pounds per gallon (0.91 kg/L), determined in accordance with ASTM D 1475. 3.2.1.3 Viscosity Shall be 20 to 1000 centipoise (0.02 to 1.00 Pa.s) at 23 C 0.5 (73 F 1) but shall not vary from the preproduction value by more than 150 centipoise (0.15 Pas), de
23、termined in accordance with ASTM D 1824 using a Model LVF Viscometer and No. 2 spindle. Preproduction value shall be recorded for future test verification. 3.2.1.4 Odor The odor of the wet coatings shall not be obnoxious when tested in accordance with ASTM D 1296. 3.2.1.5 Pot Life When mixed in acco
24、rdance with manufacturers instructions, coating materials stored at 20 to 30 C (68 to 86 F) shall have a minimum pot life of 4 hours. At the end of 4 hours, the coating materials shall show no evidence of lumping, seeding, or separation, shall meet the viscosity requirements of this specification, a
25、nd shall dilute readily to a viscosity suitable for application by spraying. 3.2.1.6 Volatile Organic Compound (VOC) Content Shall be no greater than 850 g/l when mixed and thinned to spraying consistency. Testing shall be in accordance with ASTM D 3960. SAE AMS 3138D - 4 - 3.2.2 Application Propert
26、ies Coating materials, mixed as in 4.5.1 and applied in accordance with manufacturers instructions, shall meet the following requirements: 3.2.2.1 Recoat Time Rate of cure or drying of the coating shall be such that recoat time, after which a subsequent coat may be applied without solvent softening
27、or damage to undercoats, shall be 30 minutes or less. 3.2.2.2 Tack-Free Time Shall be 4 hours or less, as shown by no evidence of removal of the film, determined in accordance with 4.5.3. 3.2.2.3 Final Cure Time Shall be no greater than 240 hours at 24 C 2 (75 F 4). 3.2.3 Cured Coating Properties Co
28、ating materials, mixed as in 4.5.1, applied in accordance with manufacturers instructions, and cured for 7 to 10 days at 24 C 2 (75 F 4), shall meet the following requirements. Application of antistatic topcoating material over not-fully-cured base material shall not retard or inhibit curing of eith
29、er the base coating or the antistatic topcoating. 3.2.3.1 Peel Strength Shall be greater than or equal to 5 pounds force per inch width (876 N/m), determined in accordance with 4.5.4. 3.2.3.2 Fluid Resistance Coatings shall show no leaching of pigment, loss of adhesion, blistering, or discoloration
30、and shall meet the peel strength requirements of 3.2.3.1 after being immersed as in 3.2.3.2.1 and 3.2.3.2.2, determined in accordance with 4.5.5. Peel testing shall be performed in accordance with 4.5.4 within 1 hour after removal from fluid. 3.2.3.2.1 Immerse in ASTM D 1193, Type IV, water at 38 C
31、1 (100 F 2) for 4 days 0.1. 3.2.3.2.2 Immerse in ASTM Reference Fuel B (ASTM D 471) at 24 C 2 (75 F 4) for 24 hours 1. 3.2.3.3 Heat Resistance Coatings shall show no evidence of melting, erosion, cracking, crazing, or other film deterioration, determined in accordance with 4.5.9. 3.2.3.4 Weather and
32、 Rain-Erosion Resistance Coatings produced on specimens and exposed six months in accordance with 4.5.11 shall exhibit no peeling or blistering, or loss of rain erosion resistance when tested in accordance with 4.5.6. The average time to erode through the full thickness of this material shall be gre
33、ater than 80 minutes for each specified condition. 3.2.3.5 Electrical Transmission Shall be determined in accordance with 4.5.7. The electrical transmission shall be greater than 90% of the uncoated panel for each specified condition. SAE AMS 3138D - 5 - 3.2.3.6 Surface Resistivity Shall be determin
34、ed in accordance with 4.5.8 for Type II coatings only. The surface resistivity of panels coated with this material shall be not less than 0.5 nor more than 15 megohms per square. 3.2.3.7 Thermal Flash Resistance Shall be determined in accordance with 4.5.10 for Class 2 coatings only. The coating sha
35、ll not burn or char. Discoloration of the coating is acceptable. 3.3 Quality 3.3.1 The coating components shall be uniform in quality and condition, homogeneous, and free from foreign material that would alter their use or function. 3.3.2 The applied coatings shall be smooth, continuous, uniform in
36、thickness, and free from pinholes, cracks, bubbles, and other film imperfections. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The manufacturer of the coating material shall supply all samples and shall be responsible for the performance of all required tests. Purchaser reserves
37、 the right to sample and to perform any confirmatory testing deemed necessary to ensure that the coating material conforms to specified requirements. 4.2 Classification of Tests 4.2.1 Preproduction Tests Tests for all technical requirements are preproduction tests and shall be performed prior to or
38、on the initial shipment of a product to a purchaser, when a change in ingredients and/or processing requires reapproval as in 4.4.2, and when purchaser deems confirmatory testing to be required. See Table 1 for the list of requirements. 4.2.2 Acceptance Tests Acceptance tests shall be performed on e
39、ach lot of material. See Table 1 for the list of requirements. TABLE 1 Requirement Paragraph Reference Preproduction Acceptance Accelerated Storage Stability 3.1.2 X X Nonvolatile Content 3.2.1.1 X X Weight per Unit Volume 3.2.1.2 X X Viscosity 3.2.1.3 X XOdor 3.2.1.4 X XPot Life 3.2.1.5 X X Recoat
40、Time 3.2.2.1 X Tack Free Time 3.2.2.2 X X Peel Strength 3.2.3.1 X X Fluid Resistance 3.2.3.2 X Heat Resistance 3.2.3.3 X Rain Erosion Resistance 3.2.3.4 X Electrical Transmission 3.2.3.5 X Surface Resistivity (Type II) 3.2.3.6 X X Thermal Flash Resistance (Class 2) 3.2.3.7 X SAE AMS 3138D - 6 - 4.3
41、Sampling and Testing Shall be as follows: 4.3.1 For Acceptance Tests A sufficient quantity of each coating material component shall be selected at random from each lot to perform all required tests. The number of determinations for each requirement shall be as specified in the applicable test proced
42、ure or, if not specified therein, shall be three or more. 4.3.1.1 A lot shall be all coating material produced in a single production run from the same batches of raw materials under the same fixed conditions, or all material subjected to the same unit chemical and physical process intended to make
43、the final product homogeneous, and presented for vendors inspection at one time. A lot shall not exceed 500 gallons (1893 L) and may be packaged in smaller quantities and delivered under the basic lot approval provided lot identification is maintained. 4.3.1.2 When a statistical sampling plan has be
44、en agreed upon by purchaser and supplier, sampling shall be in accordance with such plan in lieu of sampling as in 4.3.1 and the report of 4.6 shall state that such plan was used. 4.3.2 For Preproduction Tests As agreed upon by purchaser and supplier. 4.4 Approval 4.4.1 Sample coating material shall
45、 be approved by purchaser before coating material for production use is supplied, unless such approval be waived by purchaser. Results of tests on production coating material shall be essentially equivalent to those on the approved sample. 4.4.2 Manufacturer shall use ingredients, manufacturing proc
46、edures, processes, and methods of inspection on production coating material which are the same as those used on the approved sample coating material. If necessary to make any change in ingredients, in type of equipment for processing, or in manufacturing procedures, manufacturer shall submit for rea
47、pproval a statement of the proposed changes in ingredients and/or processing and, when requested, sample coating material. Production coating material made by the revised procedures shall not be shipped prior to receipt of reapproval. 4.5 Test Methods Shall be as follows: 4.5.1 Coating Material Prep
48、aration Each container of coating material components to be used for tests of the uncured coating material, or for preparation of coated specimens for testing of the cured coating, shall be conditioned for not less than 24 hours at 24 C 2 (75 F 4). Components of product supplied in kit form shall be
49、 thoroughly mixed in the proportions recommended by the manufacturer before sampling. SAE AMS 3138D - 7 - 4.5.2 Specimen Preparation 4.5.2.1 Specimen Material Shall be laminates of epoxy-resin-impregnated glass cloth, any fabric type, conforming to any high-quality laminate material specification, such as AMS 3831, except that specimens for heat resistance (4.5.9) and thermal flash resistance (4.5.10) shall be laminates of AMS 3844 polyimide-resin-impregnated glass cloth or AMS 3849 polyimide-resin-impregnated
