1、Space,AEROSPACEMATERIAL AMS 3844B400 Commonwealth Drive, Warrendale, PA 15096-0001SPECIFICATION Issued JUL 1979Revised FEB 1994Submitted for recognition as an American National Standard Superseding AMS 3844ACLOTH, TYPE “E“ GLASS, STYLE 7781 FABRICHot-Melt, Addition-Type, Polyimide Resin Impregnated1
2、. SCOPE:1.1 Form:This specification covers one type of glass cloth impregnated with aheat-reactive, thermosetting, hot-melt, addition-type, polyimide resinsystem, furnished in continuous rolls of full width material.1.2 Application:This cloth has been used typically for structural laminates requirin
3、g highstrength and heat resistance for long-term service up to 230 C (446 F) andshort-time service up to 260 C (500 F), but usage is not limited to suchapplications.1.3 Safety - Hazardous Materials:While the materials, methods, applications, and processes described orreferenced in this specification
4、 may involve the use of hazardous materials,this specification does not address the hazards which may be involved in suchuse. It is the sole responsibility of the user to ensure familiarity withthe safe and proper use of any hazardous materials and to take necessaryprecautionary measures to ensure t
5、he health and safety of all personnelinvolved.2. APPLICABLE DOCUMENTS:The following publications form a part of this specification to the extentspecified herein. The latest issue of SAE publications shall apply. Theapplicable issue of other publications shall be the issue in effect on thedate of the
6、 purchase order.SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineeringsciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringementa
7、rising therefrom, 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 writtencomments and suggestions.Copyright 1994 Society of Automotive Engineers, Inc.All rights reserved. P
8、rinted in U.S.A.The Engineering SocietyFor Advancing MobilityLand Sea Air and SpaceINTERNATIONALCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3844BSAEAMS 3844B2.1 SAE Publications:Available from
9、SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.AMS 2825 Material Safety Data SheetsAMS 3824 Cloth, Type “E“Glass, Finished for Resin Laminates2.2 ASTM Publications:Available from ASTM, 1916 Race Street, Philadelphia, PA 19103-1187.ASTM D 638Tensile Properties of PlasticsASTM D 638M Tensile P
10、roperties of Plastics (Metric)ASTM D 695Compressive Properties of Rigid PlasticsASTM D 695M Compressive Properties of Rigid Plastics (Metric)ASTM D 790Flexural Properties of Unreinforced and ReinforcedElectrical Insulating MaterialsASTM D 790M Flexural Properties of Unreinforced and ReinforcedElectr
11、ical Insulating Materials (Metric)ASTM D 792Specific Gravity (Relative Density) and Density ofDisplacementASTM D 2344 Apparent Interlaminar Shear Strength of Parallel FComposites by Short Beam MethodASTM D 2584 Ignition Loss of Cured Reinforced ResinsASTM D 2734 Void Content of Reinforced PlasticsAS
12、TM D 3531 Resin Flow of Carbon Fiber-Epoxy PrepregPlastics andPlastics andPlastics byiber2.3 U.S. Government Publications:Available from DODSSP, Subscription Services Desk, Building 4D,Avenue, Philadelphia, PA 19111-5094.700 RobbinsMIL-STD-2073-1 DOD Materiel, Procedures for Development and Applicat
13、ion ofPackaging Requirements3. TECHNICAL REQUIREMENTS:3.1 Material:Shall be the reinforcement specified in 3.1.1, impregnated with the resinsystem specified in 3.1.2, supplied in rolls of full width impregnated clothor slit tape, as ordered.3.1.1 Reinforcement: Shall be Type “E“ Glass, Style 7781 Fa
14、bric, conforming toAMS 3824, treated with a suitable finish to produce the requiredperformance characteristics with the resin system specified herein.3.1.2 Resin: Shall be a 100% reactive, hot-melt, resin system formed byco-reaction of bis-maleimide monomer with a tri-functional monomer and anaromat
15、ic diamine, resulting in a thermosetting resin system which thermallycures to form a polyimide structure.- 2 -Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS3844BSAEAMS3844B3.2 Storage Life:The imp
16、regnated cloth shall have a storage life of not less than three monthsfrom date of shipment when stored or shipped in a barrier container andmaintained at a temperature below 4 C (39 F).3.33.4Working Life:The impregnated cloth shall meet the requirements of 3.4 and 3.5 when tested,after warming to r
17、oom temperature, at any time up to five days after removalfrom refrigerated storage.Properties of Uncured Product:The impregnated cloth, as supplied, shall conform to the requirements shownin Table 1; tests shall be performed on the cloth supplied, sampled inaccordance with 4.3.1 after warming to ab
18、ove the dew point, and tested inaccordance with specified test methods.TABLE 1 -Properties of Uncured ClothParagraphProperty3.4.1 Resin Content3.4.2 Resin Flow3.4.3 TackRequirement33% by weight 312% 3Shall obtain tack underslight heating(will adhere to itself)Test Method4.5.24.5.33.5 Properties of C
19、ured Laminate:Shall conform to the requirements shown in Table 2, determined on specimenscut from a test laminate prepared as in 4.5.1. Specimens for elevatedtemperature tests shall be tested after exposure at the test temperature for30 minutes 1. For tests No. 1 through 6, property values specified
20、 are theminimum average of five determinations per test; no individual value shall beless than 90% of the minimum average value specified.- 3 -Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3844BS
21、AEAMS 3844BTABLE 2A - Properties of Cured Laminate, Inch/Pound UnitsTestNumberPropertyRequirementsat 77 F 9Requirementsat 446 F 9Test Method1Tensile Strength,minimumaverage55.0 ksi50.0 ksi4.5.42Edgewise Compressive Strength,minimumaverage45.0 ksi30.0 ksiASTM D6953Edgewise Compressive Modulus,minimum
22、 average3.0 msi2.5 msiASTM D 6954FlexuralStrength,minimumaverage70.0 ksi60.0 ksiASTM D 7905Flexural Modulus,minimum average3.0 msi2.5 msiASTM D 7906Short-Beam Shear Strength,minimum average6000 psi4000 psi4.5.57Specific Gravityat 73/73FPreproduction-ASTM D 792Value 0.108Void Content, maximum5.0%-AST
23、M D 2734,Method ATABLE 2B-Properties of Cured Laminate, SI UnitsTestNumber PropertyRequirementsat 25 C5Requirementsat 230 C5Test Method1Tensile Strength,minimum average379 MPa345 MPa4.5.42Edgewise Compressive Strength,minimum average310 MPa207 MPaASTM D 695M3Edgewise Compressive Modulus,minimum aver
24、age20.7 GPa17.2 GPaASTM D695M4Flexural Strength,minimum average483 MPa414 MPaASTM D 790M5FlexuralModulus,minimum average20.7 GPa17.2 GPaASTM D790M6Short-Beam Shear Strength,minimum average41.4 MPa27.6 MPa4.5.57Specific Gravityat 23/23 CPreproductionValue 0.10 -ASTM D 7928Void Content, maximum5.0%-AS
25、TM D 2734,-4-Method ACopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3844B SAE AMS 3844B3.6 Quality:Cloth, as received by purchaser, shall be uniform in quality and condition,and free from foreign
26、materials and from imperfections detrimental to usageof the cloth.3.7 Tolerances:The width shall not vary more than +1/2 inch (+12.7 mm), -0 from the width4. QUALITY ASSURANCE PROVISIONS:4.1 Responsibility for Inspection:(R) The manufacturer of cloth shall supply all samples for required tests andsh
27、all be responsible for performing all required tests. Purchaser reservesthe right to sample and to perform any confirmatory testing deemed necessaryto ensure that the cloth conforms to the requirements of this specification.4.2 Classification of Tests:4.2.1 Acceptance Tests: Tests for requirements s
28、pecified in Table 3 areacceptance tests and shall be performed on each lot.TABLE 3 - Acceptance TestsPropertyParagraphor TableReference SamplingMinimumNumber of Specimensper TestResin Content, UncuredResin Flow, UncuredResin Content, CuredSpecific Gravity, Cured3.4.13.4.24.5.1.2.3Table 2,Test 7Table
29、 2,Test 8Every Roll 2Lot Basis 4Lot Basis 2 from each test laminateLot Basis 2 from each test laminateVoid Content, Cured Lot Basis 2 from each test laminateFlexural Strength, Cured Table 2, Lot Basis 5Test 4Flexural Modulus, Cured Table 2, Lot Basis 5Test 5Short-Beam Shear Table 2, Lot Basis 5Stren
30、gth, Cured Test 6-5-ordered.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3844B SAE AMS 3844B4.2.2 Preproduction Tests: Tests for all technical requirements arepreproduction tests and shall be pe
31、rformed prior to or on the initialshipment of cloth by the manufacturer, when a change in ingredients and/orprocessing requires reapproval as in 4.4.2, and when purchaser deemsconfirmatory testing to be required.4.2.2.1 For direct U. S. Military procurement, substantiating test data and, whenrequest
32、ed, preproduction test material shall be submitted to thecognizant agency as directed by the procuring activity, contractingofficer, or request for procurement.4.3 Sampling and Testing:(R)Shall be as follows:4.3.1 For Acceptance Tests: Each lot of impregnated cloth shall be sampled atrandom on the s
33、ampling basis specified in Table 3, using the number ofspecimens specified therein for each test. Samples for the test panelsrequired for testing the cured product shall be taken in approximatelyequal amounts from three locations in the lot, selected randomly. Thereshall be no more than 500 yards (4
34、57 m) of cloth, full width, representedin any one test panel; lots of greater quantity shall require one panel foreach 500 yards (457 m) or portion thereof. In addition, a dielectric testpanel shall be prepared in accordance with 4.5.1.2.3 and submitted witheach lot for dielectric testing by purchas
35、er.4.3.1.1 A lot shall be all cloth treated at one time without significant changesin treater setting using a single batch of resin and reinforcement andpresented for manufacturers inspection at one time. A lot shall notexceed 2000 yards (1829 m) of full width product.4.3.1.2 When a statistical samp
36、ling plan has been agreed upon by purchaser and(R) supplier, sampling shall be in accordance with such plan in lieu ofsampling as in 4.3.1 and the report of 4.6 shall state that such plan wasused.4.3.2 For Preproduction Tests: As agreed upon by purchaser and supplier.4.4 Approval:4.4.1 Sample cloth
37、shall be approved by purchaser before cloth for production useis supplied, unless such approval be waived by purchaser. Results of testson production cloth shall be essentially equivalent to those on theapproved sample.4.4.2 Manufacturer shall use ingredients, manufacturing procedures, processes,and
38、 methods of inspection on production cloth which are essentially thesame as those used on the approved sample.in ingredients,If necessary to make any changein type of equipment for processing, or in manufacturingprocedures, manufacturer shall submit for reapproval a statement of theproposed changes
39、in ingredients and/or processing and, when requested,sample cloth. Production cloth made by the revised procedure shall not beshipped prior to receipt of reapproval.- 6 - Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without l
40、icense from IHS-,-AMS 3844B SAE AMS 3844B4.5 Test Methods:4.5.1 Specimen Preparation: Each roll to be sampled shall be allowed to warmabove the dew point before opening the sealed package for sampling.Immediately after sampling, the roll shall be resealed and returned torefrigerated storage.4.5.1.1
41、Tests of Uncured Product: Specimens shall be cut from test cloth andtested immediately as specified in the applicable test procedure.4.5.1.2 Preparation of Test Laminate Panels:4.5.1.2.1 Laminate panels from which tensile specimens are to be cut shall becomposed of eight plies and shall be not less
42、than 14 inches (356 mm)long in the warp direction. Laminates from which test specimens forall other tests are to be cut shall be composed of 12 plies and shallbe not less than 12 inches (305 mm) square.4.5.1.2.2 All test laminates shall be layed up with the warp parallel andunnested so that the sati
43、n shafts of the warp always face the top ofthe layup and shall be molded under appropriate pressure and cured inaccordance with resin manufacturers recommendation. The report shallinclude the cure and postcure parameters for each test laminate panel.4.5.1.2.3 A dielectric test panel, 0.540 inch +0.0
44、40, -0, (13.72 mm +1.02, -0)thick by approximately 6 inches (152 mm) square, shall be preparedessentially the same as the panels in 4.5.1.2.2 and shall exhibitessentially the same resin content, specific gravity, and void content.4.5.2 Resin Content, Uncured and Cured: Shall be determined in accorda
45、nce withASTM D 2584, using 620 C 25 (1148 F 45).4.5.3 Resin Flow: Shall be determined in accordance with ASTM D 3531, using aplaten press preheated to 175 C 3 (347 F 5) and a pressure of15 psi 5 (103 kPa 34), holding at heat and pressure for15 minutes 0.5.4.5.4 Tensile Strength: Shall be determined
46、in accordance with ASTM D 638 orASTM D 638M, using the specimen shown in Figure 1 of this specification.4.5.5 Short-Beam Shear Strength: Shall be determined in accordance withASTM D 2344, using the specimen shown in Figure 2 of this specification.4.6 Reports:The supplier of cloth shall furnish with
47、each shipment a report showing theresults of tests to determine conformance to the acceptance test requirementsand stating that the cloth conforms to the other technical requirements.This report shall include the purchase order number, lot number, AMS 3844B,manufacturers material designation, cure c
48、ycle for each test panel and panelparameters, quantity, and roll number.-7-Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMS 3844B SAE AMS 3844B4.6.1 A material safety data sheet conforming to AMS 28
49、25, or equivalent, shallbe supplied to each purchaser prior to, or concurrent with, the report ofpreproduction test results or, if preproduction testing be waived bypurchaser, concurrent with the first shipment of cloth for production use.Each request for modification of cloth formulation shall be accomplished bya revised data sheet for the proposed formulation.4.7
