1、AEROSPACE MATERIAL SPECIFICATION AMS3908 REV. AIssued 1986-04 Revised 1992-01 Reaffirmed 2014-08 Superseding AMS3908 Cloth, Aramid, (Para)Plain Weave, Thermally Stable RATIONALE AMS3908A has been reaffirmed to comply with the SAE five year review policy. _ SAE Technical Standards Board Rules provide
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5、omerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AMS3908A 1. SCOPE:1.1 Form: This specification covers a thermally stable aramid fabric in the form of cloth.1.2 Application: T
6、his product has been used typically for flight clothing but usage is not limited to such applications.2. APPLICABLE DOCUMENTS:The following publications form a part of this specification to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other p
7、ublications shall be the issue in effect on the date of the purchase order.2.1 ASTM Publications:Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.ASTM D 1424 Tear Resistance of Woven Fabrics by Falling-Pendulum (Elmendorf) Apparatus2.2 U.S. Government Publications:Availab
8、le from DODSSP, Subscription Services Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.PPP-P-1133 Packaging of Synthetic Fiber FabricsFED-STD-4 Glossary of Fabric ImperfectionsFED-STD-191 Textile Test MethodsSAE INTERNATIONAL AMS3908A Page 2 of 12 2.2.1 Other Documents: Available f
9、rom Federal Trade Commission, Washington, DC 20580.Textile Fiber Products Identification Act, Rules and Regulations2.3 AATCC Publications: Available from American Association of Textile Chemists and Colorists, P.O. Box 12215, Research Triangle Park, NC 27709-2215.Technical Manual of the AATCC, Metho
10、d 76-1262 Electrical Resistivity of Fabrics3. TECHNICAL REQUIREMENTS:3.1 Material: The cloth shall be woven from thermally stable aramid fibers. The denier shall be nominally 1.3 per filament, cut to a staple length of 1-1/2 to 2 inches (38 to 51 mm); a vendors certificate of conformance shall be ac
11、ceptable for determining conformance to these requirements.3.1.1 Yarn: Shall be two-ply for both warp and filling, determined visually.3.2 Properties: Cloth shall conform to the following requirements; tests shall be performed on the cloth supplied and in accordance with the specified test methods,
12、insofar as practicable:3.2.1 Color: Shall match Sage Green 1565. The color shall be obtained by the use of melt spun solution dyed fibers.3.2.1.1 Sage Green 1565 is a manufacturers identification number for that color.3.2.1.2 Matching: The color shall match the standard sample under artificial light
13、 having a color temperature of 7500 K and shall be a good approximation to the standard sample under incandescent lamplight at 2800 K.3.2.1.3 Colorfastness: The dyed and finished cloth shall show colorfastness to light and to laundering equal to or better than the standard sample when tested as spec
14、ified in 3.2.5.11 and 3.2.5.12.3.2.2 Weave: Shall be a plain weave, determined visually.3.2.3 Width: Shall be 45 inches 0.25 (1143 mm 6.4), inclusive of salvages.3.2.4 Nonfibrous Material: Prior to application of the antistatic finish, the cloth shall contain no more than 1.0% starch and protein inc
15、luding the chloroform-soluble and water-soluble material, determined in accordance with FED-STD-191, Method 2611.SAE INTERNATIONAL AMS3908A Page 3 of 12 3.2.5 Finishing: Cloth shall be desized, scoured, calendered, heat set, and given a durable antistatic finish to meet the requirements, shown in Ta
16、ble 1, determined in accordance with specified test methods of FED-STD-191, except as otherwise specified herein:TABLE 1 - Requirements and Test MethodsParagraph Property Requirement Test Method3.2.5.1 Weight, minimum 4.5 ounces/square yard(153 g/m2)50413.2.5.2 Yarns per inch(25.4 mm), minimum50503.
17、2.5.2.1 Warp 54 3.2.5.2.2 Filling 413.2.5.3 Breaking Strength, minimum51043.2.5.3.1 Ravel Strip Warp 72 pounds force/inch(12,609 N/m)3.2.5.3.2 Ravel Strip Filling 53 pounds force/inch(9282 N/m)3.2.5.4 Tearing Strength, Tongue, minimumASTM D 14243.2.5.4.1 Warp and Filling 65 pounds force (289 N)3.2.5
18、.5 Air Permeability at0.5 Inch (13 mm)Water Pressure, minimum25 cubic feet/minute/squarefoot (7.6 m3/minute/m2)3.2.5.6 Flame Resistance(In warp direction only)59033.2.5.6.1 Flame Time, maximum 1 second3.2.5.6.2 Glow Time, maximum 1.5 seconds3.2.5.6.3 Char Length, maximum 2.0 inches (51 mm)3.2.5.7 Th
19、ermal Shrinkage(In warp direction only)4.5.13.2.5.7.1 Average of 5 samples,maximum 5%3.2.5.7.2 Individual Sample,maximum 10%SAE INTERNATIONAL AMS3908A Page 4 of 12 3.2.5.11 Colorfastness to Light: Shall be equal to or better than the standard sample, determined in accordance with FED-STD-191, Method
20、 5660 except that suppliers submissions shall be compared with the standard sample after six hours and then evaluated.3.2.5.12 Colorfastness to Laundering: Shall be equal to or better than the standard sample, determined in accordance with FED-STD-191, Method 5041.3.2.5.13 Curling: Finished cloth sh
21、all lie flat, without distortion, and shall show no evidence of curling, determined in accordance with 4.5.2.3.2.6 Compliance with Textile Fiber Products Identification Act: Each roll of cloth not labeled or ticketed in accordance with the Textile Fiber Products Identification Act shall be counted a
22、s a defect. A lot shall be unacceptable if two or more such defects occur.3.3 Quality: Cloth, as received by purchaser, shall be clean, evenly woven, and free from foreign materials and from imperfections detrimental to usage of the cloth.3.3.1 Acceptability of each lot of cloth shall be based on im
23、perfections as defined in FED-STD-4. The cloth shall not contain more than 50 demerit points per 100 square yards (84 m2) when examined and scored in accordance with 4.3.1.3. No two individual rolls shall contain more than 75 demerit points per 100 square yards (84 m2).3.2.5.8 Dimensional Stability(
24、Shrinkage) After 15cotton launderings, maximum 56603.2.5.8.1 Warp 4.0%3.2.5.8.2 Filling 1.5%3.2.5.9 Antistatic Finish,average of 3 determinationsto the nearest1.0 x 1011ohms per square3.2.5.9.1 Before laundering5 x 1013ohms/squareAATCC 76-12623.2.5.9.2 After cottonlaundering5 x 1013ohms/square 55563
25、.2.5.10 pH 5.0 to 8.02811TABLE 1 - Requirements and Test Methods (Continued)Paragraph Property Requirement Test MethodSAE INTERNATIONAL AMS3908A Page 5 of 12 4. QUALITY ASSURANCE PROVISIONS: 4.1 Responsibility for Inspection: The vendor of cloth shall supply all samples for vendors tests and shall b
26、e responsible for performing all required tests. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the cloth conforms to the requirements of this specification.4.2 Acceptance Tests: Tests for the following requirements are acceptance tests
27、 and shall be performed on each lot:Weight: (3.2.5.1)Breaking Strength: (3.2.5.3)Tearing Strength: (3.2.5.4)Air Permeability: (3.2.5.5)Quality: (3.3)4.2.1 Preproduction Tests: Tests for all technical requirements are preproduction tests and shall be performed prior to or on the initial shipment of c
28、loth 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.4.2.1.1 For direct U.S. Military procurement, substantiating test data, and, when requested, preproduction test material shall be submitte
29、d to the cognizant agency as directed by the procuring activity, contracting officer, or request for procurement.4.3 Sampling and Testing: Shall be as follows:4.3.1 For Acceptance Tests: Sufficient cloth shall be taken at random from each lot to perform all required tests. The number of determinatio
30、ns for each requirement shall be as specified in the applicable test procedure or, if not specified therein, not less than three.4.3.1.1 A lot shall be all cloth produced in a single production run under the same fixed conditions and presented for vendors inspection at one time.4.3.1.2 The sample un
31、it shall be 5 continuous yards (4.6 m), full width of the finished cloth except for determining the nonfibrous material content, when the sample shall be 9 inches (229 mm) full width of the cloth prior to application of the antistatic finish. Lot shall be unacceptable if one or more sample units fai
32、l to meet any specified requirement. Sample size shall be as shown in Table 2. SAE INTERNATIONAL AMS3908A Page 6 of 12 4.3.1.3 Yard-by-Yard (Meter-by-Meter) Examination: Each roll in the sample shall be examined on the face side only. When the total length in the roll does not exceed 100 yards (91 m
33、), the entire roll shall be examined. When the total length in the roll exceeds 100 yards (91 m), only 100 yards (91 m) need be examined. All imperfections, as defined in FED-STD-4, Section III, which are visible at normal inspection distance of 3 feet (1 m), shall be scored and assigned demerit poi
34、nts as listed in 4.3.1.3.4 except as follows:4.3.1.3.1 Only coarse yarns that exceed twice the normal yarn diameter shall be scored.4.3.1.3.2 Mixed filling (shade bar) shall be scored only when resulting from wrong ply, wrong twist in the yarn, or off shade yarn.4.3.1.3.3 No linear yard (meter) incr
35、ements on the measuring device of the inspection machine within the sample shall be penalized more than 4 demerit points. The sample size shall be 20 rolls selected from 20 containers or one roll from each container when the lot consists of less than 20 containers. If only one roll exceeds 75 demeri
36、t points per 100 square yards (84 m2), a second sample of 20 rolls, or one roll from each container when the lot consists of less than 20 containers, shall be examined only for fabric imperfections. The lot shall be unacceptable if one or more rolls in the second sample exceeds 75 demerit points per
37、 100 square yards (84 m2). Demerit point computation for lot quality and individual roll quality shall be as follows:4.3.1.3.3.1 In inch-pound units:(Eq. 1)4.3.1.3.3.2 In SI units: (Eq. 2)4.3.1.3.4 Demerit Points: Shall be assigned as shown in Table 3.TABLE 2 - Sample SizeLot SizeYardsLot SizeMeters
38、SampleSizeUp to 800, incl Up to 732, incl 2Over 800 to 22,000, incl Over 732 to 20,117, incl 3Over 22,000 Over 20,117 5Total points scored in sample x 3600Width of cloth, inches, x total length,yards, inspected-Points per 100Square yards=Total points scored in sample x 100,000Width of cloth, mm, x t
39、otal length, m,inspected-Points per 100100 m2=SAE INTERNATIONAL AMS3908A Page 7 of 12 4.3.1.4 Examination for Length: 4.3.1.4.1 Individual Rolls: During the yard-by-yard (meter-by-meter) examination, each roll in the sample shall be examined for length. Any length found to be less than the minimum s
40、pecified or more than 2 yards (1.8 m) less than the length marked on the ticket shall be a defect with respect to length. The lot shall be unacceptable if two or more rolls in the sample are defective in respect to length.4.3.1.4.2 Total Length in Sample: The lot shall be unacceptable if the total o
41、f the actual length of the rolls in the sample is less than the total of the lengths marked on the ticket.4.3.1.5 Examination for Shade: During the yard-by-yard (meter-by-meter) examination, each roll in the sample shall be examined for shade. Any roll in the sample off shade, shaded side to side, s
42、ide to center, or end to end shall be cause for rejection of the entire lot represented.4.3.2 For Preproduction Tests: As agreed upon by purchaser and vendor.4.4 Approval: 4.4.1 Sample cloth shall be approved by purchaser before cloth for production use is supplied, unless such approval be waived by
43、 purchaser. Results of tests on production cloth shall be essentially equivalent to those on the approved sample.4.4.2 Vendor shall use ingredients, manufacturing procedures, processes, and methods of inspection on production cloth which are essentially the same as those used on the approved sample
44、cloth. If necessary to make any change in ingredients, in type of equipment for processing, or in manufacturing procedures, vendor shall submit for reapproval a statement of the proposed changes in ingredients and/or, processing and, when requested, sample cloth. Production cloth made by the revised
45、 procedure shall not be shipped prior to receipt of reapproval.TABLE 3 - Demerit Point ScoringImperfection Size Points3 inches (76 mm) and under in any dimension 1Over 3 to 6 inches (76 to 152 mm), incl,in any dimension 2Over 6 to 9 inches (152 to 229 mm), incl,in any dimension 3Over 9 inches (229 m
46、m) in any dimension 4Any of the following imperfections per each yard (m):Baggy, ridgy, or wavy clothWidth less than specifiedUneven weaving444SAE INTERNATIONAL AMS3908A Page 8 of 12 4.5 Test Methods: 4.5.1 Linear Thermal Shrinkage: 4.5.1.1 Five samples, 4 x 4 inches (102 x 102 mm) , shall be used f
47、or this test. Lines shall be marked on each sample 0.5 inch (13 mm) from each edge perpendicular to the direction in which the shrinkage is to be measured. The sample shall be mounted on a 6-inch (152 -mm) square corrosion-resistant steel plate, having a 3.5-inch (89-mm) square opening in the center
48、, and having two pins or hooks 2.5 inches (64 mm) apart fixed to one side of the plate (Figure 1), centered on a line parallel to one edge of the plate opening and 0.25 inch (6.4 mm) into the opening. A second set of pins or hooks, also 2.5 inches (64 mm) apart, shall be attached to a 10-gram weight attached to a wire leader and thread.FIGURE 1 - Sample Mount for Thermal ShrinkageSAE INTERNATIONAL AMS3908A Page 9 of 12 4.5.1.2 The sample shall be mounted by inserting the pins or hooks of the mounting plate th
