1、MIL-C-2LLS 83 7979406 038267b LI 4-1- 37-40 MIL-C-21189(Aer) 13 December 1957 NIIJTAFX SPZGIFICATION CMPH, LIIlIIIhATE.9, WO2 AKD ZPG2W TYPE AIRSHIP ENVELOPE This specification has been approved by the Bureau of Aeronautics, Depart- ment of the Navy. 1. SCOPE Dacdn(sster fiber) cloth laminated with
2、chloroprene for use in the manufacture of airship envelopes. .- This specification estabishes the requirements for high strengthweight ratio 2. APPLICABLE DOCUIIENPS 2.1 The following specifications and stardards, of the issue in effect on the date of invitation for bids, form a part of this specifi
3、cation. SPECIFICATIONS Federal - TT-A468 CCC-T-191 MiUtaq- MIL-P-6065 STAMlAiuIs Federal FED-STD-4 FED-STD-601 Military MIL-STD-O MIL-STD-129 Aluminum Pigment; Powder and Paste Textile Test Methods Packaging, Packing alri Marking of Cloth, Fabric and Webbing Glossary of Textile Terme Kubber swiping
4、and Testing Sampling Procedures and Tables for Inspection Marking for Shipment and Storage by Attributes (When requeeting specifications and standards, refer to both title and number. Copies of this specjfication and appicable specificatims may be obtained upon application to the Commanding Officer,
5、 Naval Aviation Supply Depot, Pfiiladelphla 11, Pennsylvards, Attention: Coe AD) otherwise indicated, the issue in effect on date of invitation for bids shall apply. 2.2 ther publications.- The following documents form a part of this specification. Unh6S American Society fm Testing Materials A.S.T.M
6、. Standards on Textile Ma+,erLels 1- . Licensed by Information Handling ServicesMIL-C-21L89 83 W 977990b 0382677 b (Copies of A.S.T.M. publications may be obtained fian the American Society for Testing Materials, i916 Race Street, Philadelphia 3, Pennsylvania.) 3. HEQUIRPIENTS 3.1 preproduction.- Th
7、e laminated cloth furnished for acceptance under this specification shall be a product which has been tested ami has passed the preproduction testa specified in Section 4. 3.2 Materials.- Materials shall be of the. best quality and shall conform to the applicable requirements of tRJED) TABLE OF COAT
8、iIJG DEFZCTS c. Creases d. Light Aree hen air retention is impaired or creased area is uncoated. Coating missing under 1 inch sware in area. critical defect. Wer 1 inch square is a e. Pinholes W sizes. f. cuts All sizes. g. Tears All sizes. h. Splice Ilalrc and Coating Impressions All sizes when coa
9、ting is missing and under 1 inch sqxre in area. Wer 1 inch square io area is a critical defect. i. Stains j. Streaks oil stains and dirt stains over 1 inch square in area or, 5 under 1 inch square, in 5 running yards. Coating missing under 1 inch square in crea. square in area is a criticdi defect.
10、Coating missing over 1 inch 1:. FLGh. Selvages JUI. lengths. 1. nagged Edges on E.iac Seams AU sizes. n. Alumim Coating hiissing I OY) Coating missing under 1 inch square in area. critici defect. Wer 1 inch square is a r/ The volume of chloroprene present in the coating compound shall be determined
11、in accordance with method lm of Federal Test Method Standard Bo. 601 Licensed by Information Handling ServicesMIL-C-2117 3 = 7779706 0382707 5 4.4.5.2.2 Auminieed Chlorosulfomted Polyethylene CcEipauid.- The volume of aluminized chloro- sillfonated polyetbylerie present in the coating compound shall
12、 be calculated from the formula subitted by the Contractor. 4.4.5.2.3 coating compound samples shall be determined before and after exposure to the specified accelerated aging and accelerated tieathering tests. in accordance vitb Skthod 41U of rederd Test Method Standard No. 6oi. used. Pensile i%ren
13、gth and Elongation of coating cmpvJnds.- Tbe tensile strength of cured !CensSe strength andultimate elongation shall be determined The Type III die shall be 4,4,5.2.4 Accelerated Aginc, of Coating Cmpounds.- The cured coating compound samples shall be Other samples of cured coating canpound shall be
14、 subjected subjected to 96 hours of accelerated aging in accordance vi* the Ckygen-Pressure Test Method Pll of Federal Test Method Sxmard No. 601. to % hours of oven agiw In eccor-ce with Hethod 7221 of Standard FED-SICDOl. 4.4.5.2.5 Accelerated i,!eeegtheriW of Coating Canpoundc.- The cured coating
15、 canpound samples shall AU specimens shall be tested in accordance with I.lethod 73U of Federal %st Method Standard No. 601, be st?xtched to 10 percent elongation. weathering unit using alternate “Cora D” filters. The stretched samples shall be exposed for 100 hours in the 4.4.5.3 Finishe Laminated
16、0th.- 4.4.5.3.1 of test mthods of Specification CCC-T-191, Federal Test Method Standard No. 601 and the Appendix to this specification. The finished lamineted cloth samples shall be subjected to the following TableVI list TALE VI LAKDJA!ED CLOTI! TZST METHODS Test Method No. Specification Width Bres
17、Yd Strength (using spcimens 2 inches wide) Ultimate Elowation ELonp,tion at 20 percent of breaking load (see 4.4.5.3.6) reaing Strength (Cylinder Wirst) Tearing Strength Peimeability to HydroZen Resistance to Rotoflexiw Water Resistance, hi an th fact fhat the Goverment may have fondatea, furnished
18、or in any ray supplied the said drawings, specifications, or other data is not to be regsrded by implication or othenrlse as In any manm?r licensing the holder or any other person or cor- porafion, or conveying aqy rights or pemssion to manufacaire, use or sell any patentea invention that may in any
19、 way be related fhereto. 4 Licensed by Information Handling ServicesMIL-C-21189 83 = 9977906 0382710 5 W MIL-C-21189(Ac ) APPENDIX SPECIATJ !ES73 FOR ELASTcT.IEn LAMINATED AIRSHIP ENVELOPE FABRICS 10. SCOPE 10.1 plicable for evluatlng laminated cloth used in airship envelopes. testing of these lamin
20、ated cloths it will be possible to canpare dsta obtained From several labora- tories. 10.2 IJumericsl index of Bst Methods This appenix was prepwed in order to fully describe the special test niethods +ht are ap- With a uniform method for the Breaking Strength (Cylinder mst) Resistance to Rotoflexin
21、g Resistance to Creasiry %bring Streryth seam Strength .Cylinder Elongation Resistance to Cyclic Loading Permeability to mogen with Laminated Cloth Under Tension Method NO. 10.2.1 10.2.2 10.2.3 10.2.4 10.2.5 10.2.7 10.2.6 10.2.8 1 Licensed by Information Handling ServicesMethod 10.2.1 Breaking Stren
22、gth (miinder ast ethod) 1. SCOPE 1.1 aiis test was developed in order to detemine the strength of laminated cloth baving one or more bias plies. in both jaws of the apwatus and the nili contribution of tbe bias ply is not fully realized. 2. SPEC- 2.1 The test specimen consists of a laminated cloth c
23、ylinder, 8 inches in diameter and 15 inches The seam in the test cylinder are of (figure i) a vdve to contro the flow rate of the air into the cylinder; a pressure ini- cator that is used to record the burstine pressure and the increase in circumference of the specimen during the test. 4. PROCEDURF
24、4.1 Eth 1. SCOPE J.1 This method is intended for detelmining the sean strength in the warp direction of the finished laminated cloth .for all Spes of lapped seams. 2. sPEcnm1 2.1 The specimen shall be a two inch strip and shall have the same lap 8s used in the envelape but without sewing on tapes. 3
25、. mmm 3.1 4, mccE!Dm !lhe testiw machine as described in Eiethod 10.2.4. 4.1 The specimen shall be placed symmetrically in the clamps of the machine with the long dimension parallel and the short dimension at right load. one outside edge of the front Jax of each clamp to insure the sane yarns being
26、gripped in both clamps. !Be tension on the yarns between the clamps shall be evenly distributed. angies to the direction of application of the The yarn wing parallel to the long dimension of the specimen shall be aligned parallel with 4.2 The distance between clamps shall be 3 inches at the start of
27、 the test. 5. KESULT 5.1 A total of nine specimens for each sem shall be made in the warp direction of the laminated cloth. fran the rolls of fabric used in the construction of the envelope. The average value shall not be less than the minus two sigma value established by strip tests t .- Licensed b
28、y Information Handling ServicesMIL-C-21189 3 W 9797906 0382721 T - Cylinder Elongation 1. SCOPE 1.1 This method is intended for detemining the elongation of an inflated cylinder o? laminated cloth. 2. sPEcnm1 2.1 The specimen shall be a laminated cloth cylinder, 8 inches in diameter by 30 inches lon
29、g, and open on both ends. Reference lines shall be drawn on the outside of the specimen prior to seam- ing. A center li= shall be drawn in the width direction on the rectangular piece of laninated cloth and then additional lines shall be made 6 inches away and parallel to the center line. perpenicul
30、ar to the center line a pair of lengthwise reference lines, approximately 26 inches apart and equidistant from the ends, shall be dram on the ldnated cloth. The reference lines shown in Figure 7 shall serve to facilitate measurement of elongation on the cylinder circumference. 3. APPARATUS 3.1 The a
31、ppGa-tJs shall include an air pressure source, a pressure gage, an air pressure regu- fi a directior. lator and metal caps place8 at each end of the cylinder as shown in Fgwe 1 of Method 10.2.1. flexible steel rule shall be used for making measurements. 4. moam 4.1 A The mew caps are installed at ea
32、ch end of the laminated cloth cylinder and the cylinder is inflated with air until a sicin stress is attained which corresponds to that produced in the laminoted cloth by the opersting pressure recommended by the envelope analysis. seconds shall elapse frm the start of idation until attaianient of t
33、he proper shin stress. Tbe elongation period shall bean as soon as the proper skin stress is attained. This pressure shall be maintained for 89 elongation perid of 72 hours. Measurements shall be taken between reference lines at the start of the elongation perio, at the end of the elongation period,
34、 and at intervals during the elongation period. Not more #an 5 4.2 Four specimens, one having its length in each direction (warp and filling) of the straight ply and bias ply shaU be tested and results shall be reported for each specimen, 5. RESULTS j .1 The results are reported as percent elongatio
35、n, and the highest readings are +- 25.1!: -cl+ 314 SEAM reported. FIGURE 7. TEST SPECC*iElI Licensed by Information Handling ServicesMIL-C-2LL9 3 m 7777706 0382722 L m MIL-C-ZU189(Xer) Method 10.2.7 Resistance to clic Loading 1. SCOPE 1.1 This method is intended for detenainlng the effect of a cycli
36、c load on the permeability to hydrogen property of laminated cloth, 2. SPECIMEN 2.1 The test specimen is shown in Figure 8. It is cut so that the longitudinal axis of the test specimen forms an angle with the warp of the straight ply cloth and the warp of the bias cloth such that maximum permeabilit
37、y Is produced &er cycling. 3. APPARATUS 3.1 The apparatus shall consist of: 3.1.1 A cycling mechanism capable of vertically iaising the laminated cloth test specimen Ud a load equal to 2% of the breaking strength of the laminated cloth at a rate of approximately two seconda per cycle. 3.1.2 Weights
38、for attaching to the laminated cloth specimen. 4. PROCEDURE 4.1 The laminated cloth specimen is attached to the cycling mechanism across the small dimension. At the opposite end of the test specimen a load equal to 25% of the breaking strength Is attached and the test is begun. A test consists of 10
39、,000 cycles, with a cycle consisting of applying and completely removing the load and conducting the test at &OoF. ity of the test specimen is measured initially and as soon as possible after the 10,000 cycles. The permeability to hydrogen is measured in accordance with %lethod 5460 of Federal Speci
40、fication CCC-T-191 Th e s 11s shall be tested and results orte for ea After comnTeton ofUO cycles, the tezs spdpte continued until intolerable vzies 0% penne&.ity are etthineh 5. RESULTS The hydrogen permeabil- 5.1 The permeability to hydrogen of the laminated cloth is measured in l/eq d24 hrs. R Li
41、censed by Information Handling ServicesMIL-C-21187 83 9 9797706 0382723 3 W 45“ “I L LONGIlDINAI, AXIS f I 6 / I 4 /- f 6 FIGURE 8. TEST mc13.m 10 Licensed by Information Handling ServicesMIL-C-2ll89(Aer) Lietnoa 10.2.8 permeability to iiyarogoii witn Laminated Cloth irnaer Terision 1. SCOPE 1.1 Tni
42、s aiethoa is intended for aetermining the penneabilityto &Grogen gas of larninateci cloths tint are held umer a predetermined tension during the measurement of the diffusion rate of the gas. 2. SPECRLLN 2.1 The laminated cloth specimen shall be at least 10 inches by 10 biches with reinforced sides i
43、n order that it may be placed in a metal frame anci a load can be eveiily applies to all sides. 3. ItPPhREiTUS 3.1 The test equipment shall be as follows: 3.1.1 The test apparatus shall be as escribed in MethoE 5460, Federal Specification CCC-T-191 except that it shall be modified so that permeabili
44、ty neasurerients can be made while the specimens are held uncier teiision in a metal frame. 3.1.2 The netal frames shall be macie ir, such a manner so that the laminated cloth specimen cn be inserted anu a predetermined loa can be placed on all siaes and evenly distributed on the lami- natea cloth s
45、ample. Lieans mall also be provided for checkiig the fabric tension from time to time in order that necessaxy adjustanelits can be made. Ir, PROc-LIJbRh 4.1 The laminated cloth smple is inserte ir1 the metal frame so that the warp and fill directions of the straight pl)* &re parallel to the sicies o
46、f the frame, and a load is put on all sides of the laminated cloth. lamirated cloth as etermined by Methoci 10.2.1 (Breaking Strength - Cylinder Burst Method) of this appendix, and several times dring a 72 hour perioa i? onier to be certain that the diffusion rate has stobilized. The laminated cloth
47、 tension is also checked at least thce daily in order that any load changes can be detected am5 necessary adjustments can be made. The loac applieci shall be equal to 20% of the bresiking strength of the The permehbility measurement is mae inuaeciately after the load is applied to the sample 4.2 Thr
48、ee specimens shall be tested initially and for each condition of exposure, then results shall be reportea for each specimen. 5. RESULTS 5.1 5.2 The results of the permeability to kdrogen gas reported in l/sq m/24 hrs. The laminated cloth tensions are reported in lbs/in. Licensed by Information Handling Services
