1、J I INCH-POUND I MIE-C-7350G 17 April 1992 SUPERSEDING 6 July 1981 MIL-C-7350F MILITARY SPECIFICATION CLOTH, PARACHUTE, NYLON This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. .SCOPE 1.1 Scope. This specification covers nylon cloth for fabricatio
2、n of parachute. 1.2 Classification. The cloth shall be two types as specified. Type I - 2.25 ounces Type II - 3.50 ounces 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, and standards. The follo.ring specifications and standards form a part of this document to the extent spec
3、ified herein. otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). Unless SPECIFICATIONS FEDERAL 1 *7 .I , be recorded aiid reported. T
4、he individual readings shall be 4.2.4.3 Permanence of set. Two 20 inch square specimens of the cloth shall be The specimens shall be subjected to the air permeability tests prepared. Using a template and indelible ink, an 18 inch square shall be marked on each specimen. in accordance with method num
5、bers 5450 of FED-STD-191. specified in table V shall be as follows: . The test procedures Table V. Test methods. Test Characteristics Weave Yarns Per Inch Weight Thickness Breaking Strength and Tear Strength (tongue)z/ Seam Slippage Air Permeab il i tykl Permanence of Set Chloroform Soluble Material
6、 PH Colorfastness to Light Colorfastness to Crocking Resistance to Light Resistance to Heat: Width Elongation (ravel strip)z/ Requirement Paragraph 3.2 Table I Table I Table I Table I Table I Table I Table I 3.4.2 3.4.3 3.4.4 3.7 3.7 3.4.5 3.4.5 3.8.1 (visual)- i/ 5050 504 1 5030 4.2.4.4 510421 5134
7、 4.2.4.1 4.2.4.2 5450 4.2.4.3 2611 2811 566011 565 1 5020 LlPer Figures 1, 2 and paragraph 3.3. z/The individual readings shall be reported; each value shall equal or exceed the minimum requirement. 13 I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-
8、,-_ - MIL-C-7350G 3 m 9999906 0523539 4 m MIL-C-7350 G 31Except that the clamp jaws shall be 1 inch by 1 112 inches or larger, with the long dimension of ja7 perpendicular to the direction of the load application. . AlThe individual readings shall be reported. SIExcept that the specimen shall be exp
9、osed for 20 standard fading hours. a. b. C. d. e. f. g- h. i. The specimens shall be prepared by stapling the opposite sides of the specimen together to form a loop or lskein.lt be prepared so that the warp yarns are parallel to the edges of the loop, the other so ,that the fill yarns are parallel t
10、o the edges. One of the specimens will The specimens shall be attached to a glass rod, with twine or non-rusting wire. submerged during the test. top of the test chamber. The twine shall be long enough so the specimen will be completely The glass rod must lie long enough to rest on A glass rod, 114
11、inch diameter by 21 inches long, and weighing 45 f. 5 grams shall be placed in the bottom of the loop. The container shall be filled to within 3 inches of the top with water, and the water brought to a rapid boil. Both loops shall then be suspended freely in the boiling water bath and subjected to t
12、he.action of the boiling water bath for a period of fifteen minutes, after which they shall be removed from the bath and allowed to drain for fifteen minutes. The staples shall be removed from the specimens and the specimens shall be placed on a horizontal screen to air dry. After the Specimens are
13、thoroughly dry, they shall be exposed for at least four (4) hours to a standard atmosphere of 65 percent 2 2 percent relative humidity and a temperature of 705 2OFahrenheit. The width of each 18 inch square shall be measured to the nearest 0.01 inch in six (6) places, three (3) in the warp direction
14、 and three (3) in the filling direction. The percentage of shrinkage shall be computed as follows : WO - WF WO Wo is the original width, WF is the corresponding final width. X 100 = Percent Shrinkage NOTE: The air permeability shall be remeasured in accordance with FED-STD-191, Method 5450. 4.2.4.3.
15、1 Reports. The results of the warp skein and filling skein for air permeability and shrinkage shall be averaged, and acceptance based on the average results. 14 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-7350G 83 W 0b 0523540 O W MIL-C-735
16、0G 4.2.4.4 Breaking strengths: Original and after exposure to light or heat. The test specimens for determining all breaking strengths shall be so selected that identical warp and filling yarns are tested originally and after light exposure or heat exposure. dye resistant ink before cutting as depic
17、ted in figures 3 and 4. 7 Note: exposure test specimens (both warp and filling). removed after exposure to light or heat and prior to testing the specimen. the end of the exposure period, the specimen shall be brought to equilibrium under standard conditions. In accordance with FED-STD-191, Method 5
18、104. strength shall be calculated as follows: This shall be done by marking the test specimens with A minimum 1/2 inch border is included around all four sides of all This outside border will be At The specimens shall be tested for breaking strength The percent loss in breaking Selvage Figure 3 : Wa
19、rp Tensile Strength Specimen Layout1 A = cloth width, B = 10% (min) clothwidth, C = distance between specimen groups (5Il minimum). Lower case a, b, c identifies specimen groups. Specimens are equally spaced across cloth width. (Original AvP B.S. - B.S. After Exposure) x 100 ,= percent L Original Av
20、g B.S 15 I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-7350G 83 m Ob 0523541 2 m MIL-C-7350G e I c I I I/“ YARNS I I I Selvage Figure 4: Fill Tensile Strength Specimen Layout A = cloth width, B = 10% (min) cloth width, C = distance between
21、specimen groups (5 minimum). Lower case a, b, c identifies specimen groups. Specimens are equally spaced across cloth width. (Oripinal AVE B.S. - B.S. After Exposure) x 100 = percent L Original Avg B.S 16 e I Provided by IHSNot for ResaleNo reproduction or networking permitted without license from I
22、HS-,-,- L. MIL-C-7350G 3 933970b 0523542 4 mp p p MIL-C-7350G 4.2.4.4.1 Test procedure: resistance to light. The test specimeils shall be exposed in the accelerated weathering unit as specified in FED-STD-191, method 5804. L.2.4.4.1.1 Test exceptions. The following exceptions are applicable to metho
23、d 5804: a. Suspend the specimen on the rotating rack by attaching the corners (see figure 5) to the rack. specimens are not shielded by the center specimen rack. Care must be taken to assure that the filling TOP SPECIMEN RACK MIDDLE SPECIMEN RACK (OPTIONAL) BOTTOM SPECIMEN RACK I 314 Inch (typ) Figu
24、re 5 Test Specimens: Hesistance to Light b. Use Corex D filters and sunshine carbons. c. d. e. The exposure time shall be fifty (50) hours, The spray heads shall be shut off during the entire exposure period. The drain pan shall contain 1/2 to one inch of waterduring the entire exposure period, 17 P
25、rovided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-7350 G f. The relative humidity shall be maintained at 55 X 25 X, and the black O panel temperature shall be 155OF +lOF during the entire exposure period. g. The black panel shall be removed and po
26、lished every 500 hours of use. When the black panel surface begins to fade, it shall be replaced. h. *The filter age shall range from les than 250 hours to a maximum of 2,000 hours. This shall be accomplished in the following manner: (1) Number the filter frames 1 through 8. (2) Replace all filters
27、with new filters. (3) (4) Change one filter every 250 hours until all filters are replaced. Repeat the cycle (paras (2) 6. (3) above, startingwith the Number 1 filter frame. 4.2.4.4.2 Test procedure. resistance to heat. The test: specimens (see figure 6) shall be exposed in a circulating air oven at
28、 a temperature of 356- 9OF (180+ 5OC) for one hour. The velocity of the air shall be adequate to maintain a constant temperature throughout the oven chamber. The velocity will not be so great that the specimens are forced against the rack or walls of the chamber. The specimens shall be attached to t
29、he rack of two corners and suspended free with a one-ounce clamp attached to each of the free corners (see figure 6). oven chamber shall be preheated to 356Ot 9OF (180O4 5OC:)l the rack contnining the specimens shall be placed in the chamber and one one-hciiir cycle started * The itkediately . - Not
30、e: When placing the specimens in the chamber, prevent loss of chamber temperature. do so as quickly as possible to ATTACHING CLAMPS 1 OZ. WEIGHTS I FIGURE 6. Test-specimens, resistance to heat. 18 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C
31、-7350 G 4.3 Examination for preparation for delivery. Examination shall be made in accordance with the provions of PPP-P-1133 to determine that packaging, packing and marking requirements of section 5 of this specification are complied with. 5. PACKAGING/PACKING 5.1 Packaging level. Packaging shall
32、be level A, C, or commercial as The cloth shall be packaged in accordance with the specified (see 6.2). applicable requirements of PPP-P-1133. 5.2 Packing level. Packing shall be level A, B, C, or commercial as specified The cloth shall be packed in accordance with the applicable (see 6.2). requirem
33、ents of PPP-P-1133, 5.3 Marking. In addition to any special marking required by the contract or order, shipments shall be marked in accordance with the applicable requirements of PPP-P-1133. 6. NOTES (This section contains informationof a general or explanatory nature that may be helpful, but is not
34、 mandatory). 6.1 Intended use; The fabrics are intended for use in cargo parachutes, aircraft deceleration systems and special deceleration systems. 6.2 Ordering data. Procurement documents should specify the following: a. Title, number, and date of this specification. b. Type (see 1.1). c. Color (s
35、ee 3.6). d. Quantity. e. Width (see 3.8.1). f. Length and put up (see 3. ,2 and 3. ,3). g. Selection of the applicable levels of packaging and packing (see 5.1 and 5.2). 6.2.1 Data requirements. When this specification is used in an acquisition and data are required to be delivered, the data require
36、ments identified below shall be developed as specified by an approved Data Item Description (DID (DD Form 1664) and delivered in accordance with the approved Contract Data Requirements List (CDRL), incorporated into the contract. When the provisions of DOD FAR Supplement, Part 27, Sub-Part 27.410-6
37、(DD Form 1423) are invoked and the DD Form 1423 is snot used, the data specified below shall be delivered by the contractor in accordance with the contract or purchase order requirements. Deliverable data required by this specification are cited in the following paragraph. 19 Provided by IHSNot for
38、ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-7350G 83 Ob 0523545 T W MIL-C-7350G Paragraph Data Requirement Applic!l)le DID 4.1.2 Certificate of Certification Quality Compliance DatalReport (Data item descriptions related to this specification, and identified in s
39、ection 6 willbe approved and listed as such in DOD 5000.19L, Vol. II. AMSDL. data item descriptions required by the contractors in connection with specific acquisition functions should be obtained from the Naval Publications and Forms Center or as directed by the contracting officer.) Copies of 6.3
40、Subject term (key word) listina. Air Permeability Aging Ripstop Twill 6.4 ChanRes from previous issue. Marginal notations are not used in this revision to identify changes with respect to the previous issue due to the extensiveness of the changes. Custodians: Army - GL Navy - AS Air Force - 99 Review activities: Air Force - 11 Army - AV DPSC - DLA Preparing activity: Air Force - 82 (Project 8304-0228) 20 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
