1、MIL-A-50424 13 977770b 0426774 MIL-A-50424 (MU) 23 May 1969 MILITARY SPECIFICATION ACETAL, SHEETING (FOR USE WITH AMMUNITION) 1. SCOPE 1.1 Scope.-This specification covers acetal resin in sheet form for use with ammunition. 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect o
2、n date of invitation for bids or request for proposal form a part of this specification to the extent specified herein. SPECIFICATIONS MI LI TARY MIL-A-2550 - Ammunition and Special Weapons: General Specification for STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables MIL-STD-109 - Quali
3、ty Assurance Terms and Definitions MIL-STD-129 - Marking for Shipment and Storage for Inspection by Attributes (ABC-STD-105) . (Copies of specifications, standards, rawings and publications required by suppliers in connection with specific procurement functions should be obtained from the procuring
4、activity or as directed by the contracting officer). 2.2 Other publications.-The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in effect on date of invitation for bids shall apply. CONSOLIDATED CLASSIFICATION COMMITTEE Con
5、solidated Freight Classification 21 - Ratings, Rules and Regulations, Association of American Railroads. (Application for copies of these freight classification rules should be addressed to the Secretary of Operating Transportation Division, 59 Van Buren Street, Chicago, Illinois.) FSC: 1395 Provide
6、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ - I_ MIL-A-50929 13 = 7977706 092b775 T A u ?X5-A- 5 O 4 2 4 (MU) National Motor Freight Classification No, A-2, Naming Uniform Rating Rules and Regulations (Copies may be obtained from the Issuing Officer,
7、1424 - 16th Street, N. W., Washington 6, D. C.) AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) D 618 - Conditioning Plastics and Electrical Insulating D 882 - Tests for Tensile Properties of Thin Plastic D 1004 - Tear Resistance of Plastic Film and Sheeting D 1922 - Propagation Tear Resistance of
8、 Plastic Film D 792 - Specific Gravity and Density of Plastics by D 646 - Thickness of Paper and Paperboard Materiais for Testing Sheeting and Thin Sheeting Displacement (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pen
9、na., 19103.) 3. REQUIREMENTS 3.1 Materials.-The acetal resin sheeting shall be virgin material with no reprocessed resin therein. shall be sheet. with the requirements of Table I. The form 3.2 Physical requirements.-The acetal resin shall comply TABLE I Properties Requirements Test Method Specific G
10、ravity, 23/23OC 1.410 5 .O20 4.4.1 Elongation 3, min. 10 4.4.2 Tensile Strength, Tear initiation, Tear propagation, Thickness, inches .O015 - + .O003 4.4.6 (psi), min. 7,000 4.4.3 -lbs., min. 2.5 4.4.4 gr., min. 2.0 4.4.5 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without
11、 license from IHS-,-,-MIL-A-5042q 13 W 7777706 042677b L Q MIL-A-50424 (MU) 3.3 Workmanship.-The workmanship shall be first class in every respect. The acetal resin sheets shall be free of breaks, cracks, creases, holes, surface contamination, scratches, exudation, dirt, and bubbles. The edges shall
12、 be straight and no foreign material shall be present. 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 otherw
13、ise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government The Government reserves the right to perform any of the inspections set forth in the specifi
14、cation where such inspections are deemed necessary. to assure supplies and services conform to prescribed requirements. Reference shall be made to Standard MIL-STD-109 in order to define terms used herein. The provisions of Specification MIL-A-2550 shall apply. 4.1.1 Submission of product.-At the ti
15、me the completed lot of items deliverable under the contract is submitted to the Government for acceptance, the contractor shall supply the following information accompanied by a certificate wnich attests that the information provided is correct and applicable to the product being submitted: a. A st
16、atement that the lot complies with all of the quality assurance provisions specified in this specification. b. Drawing and Specification number and date, together with an identification and date of changes thereto. c. A statement that all material purchased by the contractor meets requirements, when
17、 such material is controlled by Government or commercial specifications referenced in any of the contractual documents, and that certificates of conformance are on file and available for review. d. Number of rolls in the lot. e. Date submitted. The certificate shall be signed by a responsible agent
18、of the certifying organization. The initial certificate submitted shall be substantiated by evidence of the agents authority to bind his principal. Substantiation of the agents authority will not be required with subsequent certificates unless, during the course of the contract, this authority is ve
19、sted in another agent of the certifying organization. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-50424 13 W 797770b 042b777 3 L MIT.-A-50 4 2 4 (MU) 4.2 Inspection provisions. 4.2.1 Lot formation.-The term “inspection lot“ as used in thi
20、s specification, is defined as an essentially homogeneous collection of units of product from which a representative sample is sawn and inspected to determine conformance with applicable rnquirements. The sample selected shall represent only that quan- tity of units from which the sample was rawn an
21、d shall not be cmstrued to represent any prior or subsequent quantities presented for inspection. Homogeneity shall be considered to exist provided the inspection lot has been produced by one manufacturer, in one unchanged process, in accordance with the same drawing, same drawing revision, same spe
22、cification, and same specification revision, and complies with the provisions for submission of product as specified in MIL-STD-105. Changes to the process or specification not affecting safety, performance, interchangeability, or storage, as determined by the Government, shall not be deemed to alte
23、r the homogeneity of an inspection lot. submitted for inspection in accordance with this specification shall comply with the homogeneity criteria specified herein regardless of the type of sampling procedure which is being applied to determine conformance with requirements. All material 4,3 Testing
24、4.3.1 Sampling.-A group of five (5) rolls shall be randomly selected from each lot. from each roll, tested and inspected for compliance with the requirements of this specification. from the first or last five yards of a roll. The samples shall be conditioned as specified in the ASTM Designation D618
25、, The test results from each shall be averaged for reporting purposes. conform with the requirements of this specification shall cause rejection of the entire lot. 4 . 4 Test methods and procedures 4.4.1 Specific gravity, Major Defect, (see 6.3), Code A sample shall be removed No sample shall be tak
26、en Failure of any individual sample to No. 01001.-The specific gravity shall be determined in accordance with ACTM Nsignation D 792, Method A-l. shall be determined in accordance with ASTM Designation D882, Method B. 4.4.2 Elongation, Major Defect, Code No. 02001.-The elongation 4 Provided by IHSNot
27、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-_- L MIL-A-50Ll24 13 7779406 OLI2b77 5 = MIL-A-50424 (MU) 4.4.3 Tensile strength, Major Defect, Code No. 03001.-The tensile strength shall be determined in accordance with ASTM Designation D 882, Method B. 4.4.4 Tear ini
28、tiation, Major Defect, Code No. 04001.-The tear initiation load shall be determined in accordance with ASTM Designation D 1004. 4.4.5 Tear propagation, Major defect, Code No. 05001.-The tear propagation load shall be determined in accordance with ASTM Designation D 1922. 4.4.6 Thickness, Major Defec
29、t, Code No. 06001.-The thickness shall be determined in accordance with ASTM Designation D 646. 5. PREPARATION FOR DELIVERY 5.1 Configuration.-The width of the sheeting shall be 36 + 1/4 inches, supplied in 250 pound (min.) rolls on 3 inch cores. 5.2 Packing.-The sheeting shall be packaged in accord
30、ance with suppliers commercial practice. Protection shall be such as to Erevent deterioration during shipment and subsequent intervals preliminary to use. The sheeting shall be packed for shipment in conformance with Consolidated Freight Classification Rules and container specifications for rail shi
31、pments, or with National Motor Freight Classification Rules and container specifications for truck shipments. 5.3 Marking.-Interior packages, and exterior containers, shall be marked in accordance with Standard MIL-STD-129. 6. NOTES 6.1 Ordering data.-Procurement documents should specify 6.2 Intende
32、d use.-The sheeting is intended for use in 6.3 Inspection code numbers.-The five-digit code numbers the title, number, and date of this specification. laminated propelling charge bags for ammunition. assigned to the inspections herein are to facilitate future data collection and analysis by the Gove
33、rnment. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-50424 13 9 7779906 042b977 7 MIL-A- 50 4 2 4 (MU) 6.4 Celanese Plastics Company, 550 Broad Street, Newark, New Jersey, 07102, Film Designation XF-300 has been found satisfactory for meet
34、ing the requirements of this specification. Any other material proposed for this use should be submitted to: Commanding Officer, Picatinny Arsenal, ATTN: SMPA-ND2, Dover, New Jersey, 07801, for determination of compatibility with explosives. CUSTODIAN : ARMY-MU Project Number: 1395-A010 PREPARING ACTIVITY: ARMY-iVIU U, S, GOVERNMENT PRINTING OFFICE: 1969-393.O63/S -657 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
