1、 . MIL-C-2 30 70B 30 August 1972 SUPERSEDING MIL-C-23070A (AS) 12 April 1966 MILITARY SPECIFICATION CLOTH, LAMINATED, AND TAPE, COATED CLOTH, POLYISOPRENE, NATURALOR SYNTHETIC, RUBBER ON NYLON * This specification is approved for use by all Departments and Agencies of the Depart- ment of Defense. 1.
2、 SCOPE l. l Scope- This specification covers requirements for pro- curement of polyisoprene, natural or synthetic, rubber laminated nylon cloth and coated cloth tape used in the construction of inflatable life rafts. 1.2 Classification - The fabrics shall be of the following varieties as specified (
3、see 6.2) : Variety C - Laminated cloth, 11.4 ounces per square Variety D - Laminated cloth, 8.15 ounces per square Variety T - Coated cloth tape, 5.4 ounces per square yard, min. yard, min. yard, min. * 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in effect on the date of invita
4、tion for bids or request for proposal,-form a part of this Specification to the extent specified herein: SPECIFICATIONS Federal PPP-P-1136 Packaging and Packing of Coated (Plastic, Rubber) and Laminated Fabrics FSC 8305 and 8315 Provided by IHSNot for ResaleNo reproduction or networking permitted wi
5、thout license from IHS-,-,-Cloth, Nylon, Parachute Cloth, Twill, Nylon Webbing and Tape, Textile, Packaging and Packing of FED- STD-19 1 Textile Test Methods FED-STD-595 Colors FED-STD-601 Rubber. Samalinn and Testing I MIL-STD-105 MIL-STD-1487 Sampling Procedures and Tables for Inspection by Attrib
6、utes Glossary of Cloth Coating Imperfections I (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 con- tracting officer.) 3. REQUIREMENTS * 3.1 S
7、amples - I I* 3.1.1 Labaratorv renort amroval - Unless otherwise specified I at the time of submission of a bid (see 6.2), the bidder shall submit to the contracting officer a certified copy of a recent laboratory report covering material which he proposes to deliver. Unless otherwise speci- fied by
8、 the contracting officer, the bidder shall certify that the lami- nated cloth and coated cloth tape were manufactured in a plant where the coating will be performed if a contract is awarded. shall contain test data which demonstratesthat the laminated cloth which the supplier proposes to deliver has
9、 been tested, and complies with the requirements of this specification. reiiort will be satisfactory from the standpoint of this requirement. The laboratory report Any one of the following types of Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-
10、C-23070B 83 m 777770b 0383542 4 MIL-C-2307OB (a) (b) An independent or commercial laboratory report. The prospective suppliers own laboratory report. (c) A governmental laboratory report from a contract within 6 months of the date of submission of bid. The purpose of the above requirement is to assi
11、st the Government to de- termine the capability of bidders. to manufacture a laminated cloth meethg all the requirements of thfs specification. * 3.1.2 shall furnlsh a sample for first article inspection and approval. The submission of an acceptable sample under this requirement shall not be constru
12、ed as relieving a supplier from subsequently meeting all require- ments of the specification on all deliveries. First article - When specified (see 6.2), the supplier 3.2 Materials - The-fin-ished laminated cloth and coated cloth tape shall consist of riyaon base caoths-uniformly coated with a polyi
13、soprene, natural or synthetic, rubber compound and constructed in accordance wfth 3.5 or 3.7. X ., . .“ . 3.2.1 Base cloth - The base cloti shall be-uidyed nylon and shall conform to the following specifications or requirements: (a MIL-C-19377 (b) MIL-C-7020, Type I or Type II, as specified, except
14、that silicone oil shall not be used and the cloth . . need-not conform to the air permeability and per- . manence of finish requirements. be scoured and uniformly heat set, The cloth shall J The nylon yarn used in thiSbase cloth shall be bright, high-tenacity ; heat and light resistant polyamide pre
15、pared from hexamethylene diamine and adipic acid or its derivatives, and shall have a melting pain$ of 471.2OF (244OC) min. The yarn shall be first quality and knot free. The yarn shall be of 100 denier with 6 turns per inch in the warp direction and 5 turns per inch in filling di- rection. yams per
16、 inch in both the warp and filling direc- tion and shall weigh 2 35 - 2.55 ounces per square yard. (strip) of 115 pounds, minimum, for both the warp and filling direction. and uniformly heat set. The nylon cloth shall have a minimum 80 The cloth shall have a breaking strength The cloth shall be scou
17、red 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-23070B Each defect shall be marked with a single strand thread, sewninto the selvage opposite the defect. and, when coated, shall permit uniformity of coating on the spreading machine. after
18、 the cloth is coated (see 4.5.1). It shall not increase the cloth thickness The marking thread shall be such that it shall be visible Coatinpl - The compound used in coating and laminating the base cloths shall contain not less than 80 percent by volume of new plantation natural or polyisoprene rubb
19、er. The compound shall also contain softeners, curing agents, anti-oxidants and reinforcing ma- terials. during the compounding process so that the cured coating shall have a uniform and permanent color as specified in 3.3. of such fineness that 100 percent of the pigment shall pass through a standa
20、rd 325 mesh screen. The foundation coating and rubber coating compounds shall not be injurio.us to the base cloth and shall contain no compounding ingredients which would bloom to the surface or which would adversely affect the specified properties of the finished laminated cloth or coated cloth tap
21、e. pared in such proportionS.as to cure properly and provide pr.oofing films which shall be insoluble in water. The coating compound, cured in sheet form to the same degree of cure and in the same manner as the finished product, shall conform to the physical requirements speciffed in Table I when te
22、sted os specified in Table IX. The compound used in the outer coatings shall be pigmented The pigment shall be The compounding ingredients shall be pre- Coating adhesion - The coating adhesion test specimens described in 4.2.1.1 shall have a coating adhesion of not less than 7.0 pounds per inch of w
23、idth when tested as specified in Table VIII. Color - The color of the finished laminated cloth and coated cloth tape shall be as specified by the procuringactivity. procuring activity will usually select Color Chip 32246, lusterless orange or Color Chip 35042, lusterless blue (usually on straight pl
24、y side) of PED-STD-595 for the laminated cloth. coating of the coated cloth tape, which is not fully cured, shall not be pigmented. 4.5.4 and 6.2). The Normally, the pure gum rubber The opposite side shall match the selected color (see - - _- - _- Provided by IHSNot for ResaleNo reproduction or netw
25、orking permitted without license from IHS-,-,-MIL-C-23070B 3 7999906 0383544 M - MIL-C-23070B TABLE I Physical Properties of Cured Coating Compound Characteristic Water extract, percent Tensile strength Original, psi After heat aging for 168 hours at 212 3.5F (100 - +3C), p ercentio s s Elongation O
26、riginal, percent After heat aging for 168 hours at 212 +5F (100 +3C), per cent-io s s Shore hardness reading Original After heat aging for 168 hours at 212 - +5F (100 -OC), change 3.4 Age - Material offered for acceptance under this speci- fication shall be from current production, and not more than
27、 90 days old prior to release for shipment by the Government Quality-Assurance Repre- sentative. tions shall be stamped at the end of each roll and on the identification tags. be free of manganese and copper. The date of completion of the coating or laminating opera- The ink used for stamping this d
28、ate of manufacture on the roll shall * 3.5 Laminated cloth construction and weight distribution - The constructTon and weight distribution of components of the finished cloth shall be as speciffed in Table II. Variety C finished cloth shall be 12.5 ounces per square yard. maximum weight of the Varie
29、ty D finished cloth shall be 9.2 ounces per square yard. overlap of 314 +1/8 inch (see 4.5.3). than an average of one splice per 20 yards. The maximum weight of the The Necessary splicing shall be accomplished with a cloth Each roll.shal1 contain no more 5 Requirement 1.0 max 2300 min 30 max 450 min
30、 15 max 50 210 3.5 - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- II.I_ MIL-C-23070B 83 a 777770b 0383545 T MIL-C-2307OB TABLE II Laminated Cloth Construction and Weight Layer Variety C: 1 2 3 4 5 Variety D: 1 2 3 4 5 Material Rubber Nylon, strai
31、ght ply (3.2.la) Rubber Nylon, bias ply (3.2,lb) Rubber Rubber Nylon, straight ply (3.2.1) Rubber Nylon, bias ply (3.2.lb) Rubber Weight oz per sq yd, min 1.5 3.0 4.0 1.4 1.5 1.00 2.35 2.90 0.90 1.00 3.5.1 Manufacture - A foundation coating, which shall be com- patible with the base cloth and the re
32、mainder of the coating compound, shall be applied to the base cloths in order to achieve the required ad- hesion; ani-the coating compound shall then be applied to the base cloth by means of a spread coating operation. The rubber coating compound shall be applied in a sequence o operations so that b
33、oth sides of each variety of cloth ply shall be coated and laminated or built up to fhe construction shown in Table II. coatings. this specification. whiting talc.or other finely divided material matter which does not support mildew growth. The pigment shall be incorporated in the outermost The lami
34、nated cloth shall be cured to meet the requirements of The cured laminated cloth may be lightly dusted with 3.6 Properties of laminated cloth - The laminated cloth properties shall.conform to the requirements specified in Table III. Provided by IHSNot for ResaleNo reproduction or networking permitte
35、d without license from IHS-,-,-MIL-C-230708 3 7777906 0383546 L - MIL-C-23070B * TABLE III Properties of Laminated Cloth Characteristic Breaking strength As received Warp Filling After heat aging for 168 hours at 200 - +2“F 1-5/8 21/16; 3.10 Workmanship - The finished laminated cloth and coated. clo
36、th tape shall be made from clean, evenly woven base cloths evenly coated and uniformly processed to produce the quality and grade of prod- uct established by this specification. not exceed the specified acceptable quality levels specified herein. The occurrence of defects shall 4. QUALITY ASSURANCE
37、PROVISIONS 4.1 Responsibility for inspection - Unless otherwise speci- fied in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements- as specified- herein. cept as otherwise specified in the contract or order, the supplier may use his own or a
38、ny other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. Ex- The G
39、overnment reserves the right to perform.any of the * 4.1.1 Certificate of compliance - A certificate of compliance shall be furnished with each shipment or lot stating the following re- quirements have been met : (a) The compound in the coating contains a minimum of 80 percent natural or polyisopren
40、e rubber, by volume (see 3.2.2). (b) The remainder o the coating compound consists o safteners, curing agents, anti-oxidants, and rein- forcing materials (see 3.2.2). The dusting powder does not support mildew growth (see 3.5.1). (c) (d) The ink for stamping the date of manufacture on the roil has n
41、a manganese or copper (see 3.4). Ce) The coating film shall be insoluble in water (see 3.2.2). -? .9 .- P Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-P-23070B submitted in accordance with 3.1.2 shall be visually inspected for ap- pearance a
42、nd color. perties in accordance with the methods specified in 4.5. The sample shall be tested for all physical pro- I 4.2.1 Adhesion of coatinn mecimen - pieces of base cloth see 3.2.1) measuring 12 by 12 inches shall be coated with the uncured coating compound described in 3.2.2. be constructed so
43、that adhesion will be measured in the warp direction of the straight ply. The 2 pieces shall be placed together coating to coating, except for a 1 inch wide separation alpng one edge allowed by insertion of paper, The specimen shall be cured in the same manner and degree of cure as the finished prod
44、uct. The specimen shall be made to represent the construction and weight distribution for laminated cloths as shown in Table II. The specimen shall 4.3 Inspection - Sampling for inspection shall be performed in accordance with MIL-STD-105, except where otherwise indicated herein- I after* 4.3-1 Comp
45、onent and material inspection - In accordance with 4.1 above, components and materials shall be tested in accordance with all the requirements of referenced specifications, drawings and standards unless otherwise excluded, amended, modified or.qualified in this speci- I fication or applicable purcha
46、se documents. I - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-23070B 83 M 777770b 0383550 3 MIL-C-23070B All defects found shall be counted regardless of their proxi- mity to each other except where two or more defects represent a single lo
47、cal condition of shall be counted. A continuous defect shall be counted as one defect for each warpwise yard or fraction thereof in which it occurs. sample unit shall be 1 linear yard. The acceptable quality level (AQL) for this examination shall be 6.5 defects per 100 units (yards). sample size sha
48、ll be based upon inspection level II of MIL-STD-105. The lot size shall be expressed in units of 1 yard each The number of rolls from which the inspection samples are to be selected shall be in accord- ance with Table VI. An approximately equal number of yards shall be ex- amined in each roll of the
49、 inspection sample. All coating defects shall be marked on the defect and at the selvage edge adjacent to the defect. All such defects shall be cut out and eliminated by the fabricator. the cloth, in which case only the more serious defects The inspection The TABLE V List of Defects Any cut, hole, pinhole, tear, scratch or abrasion mark. Any blister or delamination. Any lump or for
