1、MIL-C-28927 (MC) 5 June 1969 SUPERSEDING See Section 6. MILITARY SPECIFICATION CLOTH, TAFFETA, NYLON: POLYURETHANE COATED 1.0 SCOPE 1.1 This specification covers the requirements for one type of poly-! urethane coated nylon cloth. 20 APPLICABLE DOCUMENTS 2.1 The following documents of the issue in e
2、ffect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein: SPECIFICATIONS FEDERAL O- 1-563 CCC-T- 19 1 PPP -P - 1 136 - Insect Repellent, Clothing and Personal - Textile Test Methods. - Packaging Application. and Packing of Coated
3、(Plastic Rubber) and Laminated Fabrics. STANDARDS FEDERAL FED-STD-406 FED-STD-601 - Plast-2s; Methods of- Testing. - Rubber; Sampling and Testing. MIL I TARY MIL-STD-105 - Sampling Procedures and Tables for Inspection By .Attributes. FSC 8305 Provided by IHSNot for ResaleNo reproduction or networkin
4、g permitted without license from IHS-,-,- . MIL-C-28727 83 W 7779706 0386217 8 W MIL-C-28927 (MC) (Copies of specifications and standards required by supplies in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.)
5、3. REQUIREMENTS 3.1 Laboratory report approval. Unless otherwise specified (see 6.2) at the time of submission of a bid, the bidder shall submit to the contrac- ting officer, a certified copy of a recent laboratory report covering the coated cloth which he proposes to deliver. Unless otherwise speci
6、fied (see 6.21, the bidder shall certify that the coated cloth was manufactured in a plant where the coating will be performed if the contractor is awarded. The laboratory report shall contain test data which demonstrates that the coated cloth which the supplier proposes to deliver has been tested a
7、nd found to comply with all requirements of this specification. Any of the following types of reports will be satisfactory from the stand- point of this requirement: (a) An independent or commercial laboratory report. (b) The prospective bidders own laboratory report. (c) A Governmental laboratory r
8、eport from a contract within 6 months of the date of submission of bid. The purpose of the above requirement is to assist the Government in determining the capability of bidders to manufacture a coated cloth meeting all the requirements of the specification. The submission of an acceptable report un
9、der this requirement shall not be construed as relieving a supplier from subsequently meeting all requirements of the specification on deliveries. and informatipn to the supplier (see 6.4). cation may appear in the sample, in which case the specification shall govern. 3.2 Standard sample. Samples, w
10、hen furnished, are solely for guidance Variation from the specifi- 3.3 First article.approva1. Unless otherwise specified (see 6.21, be- fore production is commenced, a 3-yard sample of the coated cloth and 1/2 yard, full width, of the uncoated base cloth shall be submitted or made available to the
11、contracting officer or his authorized represen- tative for inspection as specified in 4.2.1, The approval of the first article authorizes the commencement of production, but does not relieve the supplier of the responsibility for compliance with all provisions of this specification. supplier at the
12、same facility to be used production items. The first article shall be manufactured by the for the manufacture of the Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-Z!8727 83 7779906 0386218 T W 3.4 Materials. 3.4.1 Base fabric, The base fabric
13、 (uncoated) shall be woven taffeta manufactured from bright high tenacity filament nylon conforming to the requirements specified in Table I, and shall be tested as specified (see Section 4, Table IV, for required tests). Table I - Physical requirements Weight per square yarns per Breaking yard - ou
14、nce inch strength pounds Weave Min. Max. Minimum Minimum 2.0 2.5 Warp 38 Warp 115 Filling 38 Filling 115 Plain 3.4.1.1 Color and finish. The base fabric shall be undyed. The undyed fabric shall be scoured and heat-set to minimize shrinkage in the coating operation. tortion or puckers. The cloth afte
15、r heat-setting shall show no appreciable dis- 3.4.2 Coating compound, The coating compound shall be a composition of polyurethane suitably compounded and pigmented to meet the requirements herein. If the polyurethane is plasticized, only phthalate or .phosphate ester plasticizers shall be used. The
16、incorporation of an isocyanate (PAPI or MDI) in the top coating using a thermo-plastic polyurethane, or the use of a thermo-setting polyurethane, has been found necessary to meet the requirements of this specification. intended to guarantee a waterproof cloth with adequate resistance to mildew and b
17、acterial degradation. The coating limitations are 3.4.2.1 Resistance to insect repellent. The coated fabric, when tested for resistance to insect repellent, shall show no lifting of the coating, no tackiness, .no_solvation, pickoff of the coating or adherence of the coating to itself (see Section 4,
18、 Table IV, for required tests). whiting, talc or other finely divided mineral which does not support mildew growth. 3.4.3 Dusting powder. The dusting powder, when used (see 3.51, shall.be 3.5 Coating of cloth. The cloth shall be coated on one side only with the coating compound specified in 3.4.2 an
19、d shall conform to all the re- quirements of Table IL. The coated cloth shall be tested as specified herein (see Section 4, Table IV, for required tests). repellent finish shall be applied to both sides of the coated cloth. Water emulsion or solvent soluble silicone water repellents, General Electri
20、c DF 1042 or Dow Corning Sylmer 75 or equal, have been found satisfactory for this purpose. the coated side may be dusted with the dusting powder specified in 3.4.3. of the caated fabric and shall be easily removed with a damp cloth. A suitable water At the option of the supplier, The dusting powder
21、 shall not be applied prior to final curing 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-28927 83 W 997990b 038b220 8 W MIL-C2.8927 (MC) natu
22、ral (north sky) daylight or artificial daylight having a color temper- ature of 7,500: Kelvin and shall be a good approximation of the standard sample under incandescent lamp light of 2,8000 Kelvin. 3.6 Length and put-up. specified in PPP-P;1136. The maximum number of pieces per roll shall be three
23、and no single piece shall be less than 25 yards. -The ends of the pieces shall be overlapped, not joined by a seam. The coated cloth shall be put up on rolls as The minimum length of any roll shall be 50 yards. 3.7 Width. The minimum overall width shall be 52 inches (see 6.2). Selvages shall be trim
24、med to give a straight, uniform edge. 3.8 Odor. The coated cloth shall be free from any objectionable odor. 7 3.9 Workmanship. The finished cloth shall be evenly coated and shall con- form to the quality and grade of product established by this specifications The occurrence of defects shall not exce
25、ed the specified acceptable quality levels. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specifi
26、ed in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection require- ments specified herein, unless disapproved by the Government. The Govern- ment reserves the right to perform any of the inspections set forth in the specification
27、 where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements, submitted,the Government reserves the right to check test such items to determine the validity of the certification. 4.1.1 Certificate of compliance. Where certificates of compliance are
28、4.2 Preacceptance inspection, 4.2.1 First article inspection. The first article submitted in accord- ance with 3.3 shall be visually inspectedfor appearance and color in accordance with 4.3.2.1 and tested for physical and chemical characteristics in accordance with 4.3.4 to the. extent applicable. 4
29、.3 Inspection. with MIL-STD-105, except when otherwise indicated herein, Sampling for inspection shall be performed in accordance 4.3.1 Inspection of components. In accordance with 4.1, components and materials shall be inspected and tested in accordance with all the re- quirements of referenced spe
30、cifications and standards unless otherwise excluded, amended, modified or qualified in the specification or applicable purchase documents. A certificate of compliance shall be furnished with eachtshipment or lot stating the following: 5 Provided by IHSNot for ResaleNo reproduction or networking perm
31、itted without license from IHS-,-,-_- MIL-C-28727 3 7977706 0386221 T H M IL - C 2 89 27( MC (a) (b) The plasticizer used is phthalate or phosphate ester (when (c) (d) (e) The base fabric has been scoured and heat-set, (f.) The coating compound is polyurethane. coating compound is plasticized). coat
32、ed cloth is dusted). The dusting powder used does not support mildew growth (when The yarn used in the base fabric is bright filament nylon. A suitable water repellent finish has been applied to both the coated and uncoated side of the cloth. 4.3.2 Examination of the end item. The end item shall bee
33、xamined in. accordance with 4.3.2.1 and 4.3.2.2. The lot size for purposes of deter+ mining the sample size in accordance with MIL-STD-105 shall be expressed in units of one yard each for the examinations in 4.3.2.1 and 4.3.2.2. 4.3.2.1 Yard-by-yard examination. The required yardage of each roll sha
34、ll be inspected on the coated side only. Visual defects shall be as listed below. for pinholes and lightly coated areas. The defects found shall be counted regardless of their proximity to each other, except where two or more defects represent a single local condition of the cloth, in which case one
35、 defect shall be counted, A continuous defect shall be counted as one defect for each warpwise yard or fraction thereof in which it occurs. The sample unit for this examination shall be 1 linear yard. The acceptable quality level for this examination, including the pinholes and lightly coated areas
36、found in the through-light examination shall be 4.0 defects per 100 units (yards). 105. be in accordance with Table III. shall be examined in each roll sampled. The same yardage shall be given a through-light inspection The inspection leve1,shall be level II of MIL-STD- The number of rolls from whic
37、h the samples are to be selected shall An approximately equal number of yards Examine Coated side Defect Any cut, hole tear, scratch or abrasion mark. Any pinhole. Any uncoated area. Any thinly coated area. Any blister, tunnel or delamination of coating. Any light area or window-resulting from impro
38、per Any lump or heavily coated area. Crease or wrinkle that cannot be corrected by manual pressure or resulting in doubling or adhesion of surf aces. or noticeably thinner. distribution of pigment. Uneven coating-thin area where coating is missing Provided by IHSNot for ResaleNo reproduction or netw
39、orking permitted without license from IHS-,-,-MIL-C-28727 83 9 9797706 0386222 I 9 MIL-C- 28927(MC) Examine Defect Any spot, stain or streak - more than 1 inch in its Any slubs, kinks or other raised areas which result Any embedded foreign matter. Any scorch or burn. Off shade. longest dimension, L/
40、 in coating streak or absence of coating. Width Trimmed width less than minimum specified. Selvages not trimmed. Edges not straight and uniform. General 7 Objectionable odor. 21 Not clean. Curled, folded, scalloped or rolled edges extending for mole than 1/3 of the roll. - i/ 2J Clearly visible at n
41、ormal inspection distance (approximately 3 feet). Odors of chemicals commonly used in coating compounds shall not be regarded as objectionable. TABLE III. - Sample size Lot size Sample size Maximum number of (yards 1 (rolls) defects acceptable !/ up to 1200 21 3 1201 up to and including 3200 5 35,00
42、1 up to and including 150,000 20 3201 up to and including 10,000 8 10,001 up to and including 35,000 13 150,001 and over 32 L/ Applicable to length examination only (see 4.3.2.2). 2J If lot contains .fewer than 3 rolls, each roll in the lo chal? be examined. 4.3.2.2 Examination for length. 4.3.2;2.1
43、 Examination for length in individual roll. Each individual roll in the sample shall be examined for number of pieces, length of pieces and for gross length. The sample unit for this examination shall be one roll. The sample size (number of rolls selected as sample) and the maximum acceptable number
44、 of defects shall be as shown in Table III. Any of the following shall be considered a defect with respect to length: 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-C-28927 83 m 9997906 0386223 3 m Defects Any roll containing more than 3 piec
45、es. Any piece in roll less than 25 yards. Any roll with a gross length of less than 50 yards. Any roli with a gross length,more than 2 yards less than that marked on ticket. 4.3,2.2.2 Examination for total yardage in sample. The rolls examined shall be those selected for examination of individual ro
46、lls as specified in 4.3.2.2.1. The lot shall be unacceptable if the total of the actual gross lengths of rolls in the sample is less than the total of the gross lengths marked on the roll tickets. 4.3.3 Examination of preparation for delivery. Examination shall be made in accordance with the provisi
47、ons of PPP-P-1136 to determine com- pliance with the packaging, packing and marking requirements of Section 5. 4.3.4 Testing of the end item. The methods of testing specified in CCC-T-191, whenever applicable, and as listed in Table IV, shall be followed. The requirements for all tests are reference
48、d in 3.5. Except for color- fastness, blocking and the visual aspects of resistance to accelerated weathering and high humidity, the physical values specified apply to the average of the determinations made on a sample unit for test purposes as specified in the applicable test methods. blocking and
49、the visual aspects of resistance to accelerated weathering and high humidity shall apply to each determination. be 3 continuous yards, full width, of the coated cloth and 1/2 yard, full width, of base fabric. The lot size shall be expressed in units of 1 linear yard and the sample size (number of sample units) shall be as specified below. The lot shall be unacceptable if any unit fails to meet any requirement speclfied. Requirements f
