1、MiL-c-W General Specificationa, Test Methods. MILIThFtY MIL-B-3.30 - Barrier-E,lattrial, Paper, Noncorrosive. bIIL-G-2550- General Specification for Ammunition Except Small Arms Bmmunition. MIGP-10025- Packing and Marking for Domeetic Shipment of Inert Amnunition Components, General Specification fo
2、r. (Copies of specifications required by contractors in connection with specific procurement functions should be obtained from the procuring agency or as directed by the contracting officer.) 3. rnQUI?3!IENTS 3.1 Material. -The rayon cloth covered by this specification shall be 3.2 Color. - The colo
3、r of the rayan cloth shall be natural. unbleached 3.3 DDeakance. - The rayon cloth shall be uniform and shall? have no 3.4 %idth, - The width of the cloth shall be as specified (see 6.1). 3.5 Weight. - The weight of the rayon cloth shall be between 5.00 and 3.6 Breaking strencrth. - The breaking str
4、ength of the cloth, determined womn from viscose rayon yarns, in both warp an2 filling. contain no acetyl groups and not more than 0.2 percent sulfur. or bleached white. visible Fmperfections. The specified width shaU be not less than 36 inches. shall be determined ae specified in 4.4.1. The rayon s
5、haU The width of the cloth 5.75 outices per square yard, determined as specified in 4,4,2. ;i 5%: *- I /Y. I as specified in 4.4.3, shai be as follows: Rarp direction: blinimuai 70 Funds, Maximum ut0 pounds. . -. Filling direction: Minimum 70 pounds, bkxsmUn l.40 poUr,ds. L Provided by IHSNot for Re
6、saleNo reproduction or networking permitted without license from IHS-,-,-3.7 Ether extract.- The ether extract of the rpryon cloth shall be not more 3.8 hidits or alkalinitr.- Iphe acidity or alkalinity of the water extract of than 1.0 percent by weight, determined as specified in 4.4.4. the rayon c
7、loth, determined as specified in 4.4.5, shall be as follows: Mineral - None Organic - 0.10 percent, maxiainm 3.9 u.- The ash content of the cloth, deternined as saecified in 4.4.6, shall not be more than 0.2 percent W weilot number, and lot size. U1 acceptance tests shall be-made on the conposiQe -l
8、e, using 8s many of the pieces as possible in making each of the tests. lot is not uniform, the inspector may require tbt any of the primary sampl.es be tested for compliance with the specified requirements. All prime,ry samples ahall be held for possible future examination should the composite samp
9、le fail to meet the requirements. 4.3 MILG-2550, and shall be at the noint of delivery anless otherwise mecifiea. 4.0.1 W=.- Width of the cloth du and do not allow the volume of the liquid et any time to became less than 75 ml. t the end of the 30 minute yeriod adi.e., coineident with the zero on th
10、e scale behind the respctive gage. !Che failure of the water columns to return to their original positions indicates that either the water system 38 ologgad OP that the gages are arty, Sn such case cletin the water system and the gages, and repeat the determination. . If the litmus paper 4,4,6 a,- C
11、ut.smal1 portions of cloth from each of the pieces comprising the then the con- 4.407 $ir Dermeabi1itZ.- Determine the air permeability of the cloth by the Level the instrument by means of the leveling With both chambers open to the air adjust the Provided by IHSNot for ResaleNo reproduction or netw
12、orking permitted without license from IHS-,-,- Correot the vertical gage reading to mF and 30 inches-of-mercury pressure by meass of the following formula: where: = corrected vertical pressure gage readhg, in inches-of-water h = observed vertical pressure gege reading, in inches of water. p = prevai
13、ling barometric pressure, in inches of mercury. t =prevailing temperat-are, in degrees Yahrenheit. at 6V and 30 inches-of-sercury pressure. Caibrate the volume of air flowing through the particular orifice uaed in the instment br mearis of the following air-flow calibration values for ea orifice hav
14、ing a iemeter of 1.0 m (at 6F md 30 inches of mercury pressare): Discharge for 1.0 mm orifice Corrected vertical gage reading (ho) Air flow rate (liters Der minute) (Inches of water) 11 31 3 e24 7 .a7 2e66 5.91 2.32 3,94 1.89 2.76 1.58 (Intermediate points sb3.l be determined by interpolation,) At a
15、 given pressure drop across en orifice, the voume of air oassing through the orifice varies in dlrect proFortion to the square of the iarneter of the orifice. !bas, if there is a pressure drop of 2.76 inches across an 8.0 mm ori ice, the com- puted air flow would be, according to the above calibrati
16、on, 1.58 x 8 - 101.1 liters of air per minute. However, inasmuch as orifices cannot be constmcted perfectly, the air-flow cslibrationa shall be as established by a National Bureau of Standarda aelibration of the actual orifice used. liters of air pssing per minute through the Oefinite e-osed area 6f
17、 the fabric. Translate the volUme of air passing through the sample into terms 02 cubic feet per minute, and then into cuba feet per minute Der spupre foot of cloth, in direct proportion to the definite elcposed area of the test eecimen (see 6,2). 4,5 Re_srbmision and retest.- If the conpoaite sampl
18、e, or my primary sample, faila to pass the qecified tests, the lot shall be rejected. The contractor shall have the option of having a complete or a partial analysis mde on samples, from any OF ail. of the bales or boxes in the lot, at no expense to the Goverment. aie con- tractor may then remove th
19、e defective portions of the lot and resubmit the lot for acceptance, provided that replacement of the defective portions is made to the satis- faction of the inspector, The resubmittedlot shall be accepted if the new samplea, selected as specified in 4.2, pass all the required teats. - Born the NBS
20、calibration, calmilafe the 6. PRXPARATIOHFOB nELIvERY - 6.1 Pacm.- Unless otherwise specified, tbe rayon cloth shall be packaged in bolts, the cloth being either folded or rolled. If rolled, the cloth shall be wound on a cardboard or other suitable tube having an internal diameter of approxi- mately
21、 Z ncea, its length approximating the Wf containers, - In addition ta any special markinge specified 6, NOTES 6.1 Procurement documents should specify the fellowingt a, Title, number, and date of this specification, b, Nidth of cloth required (me 3,4), Q. Special markings of ahipping containers requ
22、ired . (see 5.3.2) 6,2 The air pemeability of the cloth may be determined with the btrument .described in National Bureau of Standards Research Paper R.P. U71 entitled “improved Instrunent for Measuring the Air-Permeability of Babricsm, Journal of Research of National Bureau of Standards Vpl, 28, da
23、ted May 28, 1942; or by any other suitable instment approved by the procuring agency. Notice, - When Government drawings, specifications, or other data are used for any purpose other than in connection with a definitely related Govern- ment procurement operation, the United S-tes Government thereby
24、incurs no responsibiiity nor any obligation whatsoever; and fact that the Government my have formulated, furnished, or SS any way supplied the said drawings, specifi- oations, or other data, is-not to regarded by implication or otherwise as in any manner licensing the holder or any other person or c
25、orporation, or conveying any rights or permission to manufacture, use, or sell any patented invention that niay 5i ang nay be related thereto, Custodian: Army- Ordnanoe Corps 7 ._ - - . . - . - - !-. - .- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
