1、* bF MIL-C-3835LA 83 = MI 9999906 0474978 3 ITAY PECIF MIL-C-3835 lA (USF ) 22 August 1972 SUPERSEDING MIL-C-3835 1 (USAF) 18 March 1965 T ION CLOTH, PARACHUTE, NYLON, AROMATIC, NONMELTING 1. SCOPE 1.1 Scope. This specification covers requirements for two types and three classes of aromatic polyamid
2、e cloth. 1.2 Classification. The aromatic polyamide cloth shall be of the following types and classes, as specified (see 6.2). Type I, class 1 - 4.7 oz. Type I, class 3 - 12.0 oz. Type II, class 1 - 7.0 oz. Type i, class 2 - 6.5 OZ. Type II, class 2 - 18.0 oz., resin treated 2. APPLICABLE DOCUMENTS
3、2.1 The following documents, of the issue in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein: SPECIFICATIONS Federal PPP- P- 1 1 3 3 Packaging and Packing of Synthetic Fiber Fabrics STANDARDS Federal Fed Std No. 4 Glossa
4、ry of Fabric Imperfections Fed Std No. 191 Textile Test Methods FSC 8305 , Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-C-3835LA 83 999990b 0474979 5 M iz L MIL- C-3 835 1A (USAF) Mi li tary MIL-STD-105 Sampling Procedures and Tables for Insp
5、ection by Attributes (Copies of specifications, standards, drawings and publications required by suppliers in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) 2.2 Other publication. The following document forms
6、a part of this specification to the extent specified herein. Unless other- wise indicated, the issue in effect on date of invitation for bids or request for proposal shall apply. Federal Trade Conmission Textile Fiber Products Identification Act, effective March 3, 1960. (Copies may be obtained with
7、out charge from the Federal Trade Comnission, Washington D. C. 20580.) 3. REQUIREMENTS 3.1 Yarn. aromatic polyamide. below 675OF when tested as specified in table II. 3.2 Construction and physical properties. The construction and physical properties of the finished cloth shall be as specified in tab
8、le I and 3.3 through 3.10. The yarn shall be a 200 2 15 denier, nonmeltfng, The yarn shall not char at a temperature 3.3 Width. The width, inclusive of selvage, for all types and classes of cloth shall be as specified by the procuring activity (see 6.2). 3.4 Weave 3.4.1 Typ e I, class 1. The weave s
9、hall be 2-up, 2-down, right- hand twill. 3.4.2 pi, e I, classes 2 and 3. The weave shall be as shown in figure 1. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Y v) al rl U k al a O $4 a rl m U .d v) R a a C m C O ?-I U U =, k U O U : H al rl P I
10、d w bo cc ? NN mm hlN O0 *d O0 mm mm O0 mm Nrl mm NN * mo o0 “ mm om U (I? al U v) rl C Y C U O -I U v v v) o -I n 2 n a al- kC (dm a aal E ald Po al ria rim (d : %E (d m3 U Mal iu c uu vu alo M mal v) MIL-C-3835l.A (USAF) Q al U. ri v) 1 Provided by IHSNot for ResaleNo reproduction or networking pe
11、rmitted without license from IHS-,-,-MIL-C-3835LA 83 9999906 0474987 4 MIL- C- 3835 1A (WAF ) 4.4 in Fed Std. No: 191, wherever applicable, and as listed in table III shall be followed. The physical and chemical values Specified a in Section 3 apply to the average of the determinations made on a sam
12、ple unit for test purposes as specified in the. applicable test methods. The lot shall be unacceptable if one or more units fail to meet any requirements specified except for the permeability test (see 4.4.1). The lot size shall be expressed in terms of 1 yard each. sample unit for all type I, and c
13、lass 1 of type II cloth shall be 2 continuous yards, full width, of the finished cloth. The sample unit for type II, class 2 cloth shall be 1-1/2 continuous yards, full width of the cloth prior to resin treatment, and one- half yard, full width, of the treated cloth. Testing of the end item. The met
14、hods of testing specified The sample size shall be as given under 4.2.1. The 4.4.1 Air permeability. A 2-yard sample, the full width of cloth, shall be selected from each shippers roll and shall be tested for air permeability as specified in table III. Failure to meet the air permeability requiremen
15、t shall cause rejection of the roll of cloth represented. 4.4.2 Breaking strength after aging. The size of the specimens shall be the same as specified in the unaged tests (see table III). The specimens shall be placed in an oven at 500 + 10F for 24 hours. Upon removal, the specimens shall be condit
16、ioned at standard conditions for 4 hours and tested for breaking strength as specified in table III. treatment shall be reported as percent of the unaged specimens. 5. PREPARATION FOR DELIVERY The breaking strength after the aging 5.1 Packaging. Packaging shall be level A, B, or C as specified (see
17、6.2). 5.1.1 Levels A, B, and C. The cloth, put up in rolls, shall be packaged in accordance with the applicable requirements for class 2 fabrics of PPP-P-1133. 5.2 Packing. Packing shall be level A, B, or C as specified (see 6.2). 5.2.1 Levels A, B, and C. The cloth shall be packed in accordance wit
18、h the applicable requirements of PPP-P-1133. 10 n Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-U i MIL-C-3835LA 83 9999906 0474988 b , 5.3 Marking. contract or order, shipments shall be marked in accordance with the applicable requirements of PPP-
19、P-1133. In addition to any special marking required by the 5.4 Age, date of manufacture to the date of delivery. The cloth shall be not more than 2 years old from the 6. NOTES 6.1 Intended use. The cloth is intended for use in the manufacture of parachute canopies, packs, and pack stiffeners. 6.2 Or
20、dering data. Procurement documents should specify the following: a. Title, number, and date of this specification. b. Type and class of cloth required (see 1.2). c. Width and quantity required (see 3.3). d. Selection of applicable levels of packaging and packing (see 5.1 and 5.2). 6.3 Nomex (formerl
21、y called HT-l), manufactured by E. I. duPont, is an acceptable yarn, 6.4 Finish. The type II, class 2 cloth has been made successfully by using the following finishing process: Scour: 180F for 30 minutes in a jig 1 g/l Duponal RA 1 g/i TSPD Overflow rinse until clear Dry: Minimum tension on tenter f
22、rame (250%) Finish: Pad at 80F, 2 dips; 2 nips to 30 percent wet pickup 660 g/l Resloom M-75 10 g/l Diammonium phosphate Dry: Minimum tension on tenter frame (2509) Cure: Minimum tension on tenter fram (400OF for 3 minutes) Wash: Crab one pass over one roll 2 g/l sodium perborate at 80% Crab one pas
23、s over one roll Clear water at 80F Minimum tension on tenter frame (250%). Dry: Cus t od ian : Air Force - 11 Reviewer : Air Force - 82 Preparing activity : Air Force - 11 Project Number : 8305-0904 11 * U. & GOVERNUENT PRINTING OFFICB 1972 -714-537/1346 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
