1、i - MIL-0-60540 ) 30 June 1966 h W c MIL-0-60540 13 777770b 0434505 2 1. 1.1 Polyvinyl 2. 2.1 MILITARY SPECIFICATION OB!CURATING BANDS, PLASTIC, RIGID, HIGH IMPACT, POLYVINYL CHLORIDE (MOLDED) SCOPE This is the applicable specifi*:ation for Rigid, High Impact, Chloride Plastic Obturating Bads (Molde
2、d), for artillery ammunition. APPLICABLE DocmNTs The following documents of the issue in effect on date of invitation for bids or request for proposal, form a part of the specification to the extent specified herein: SPECIFICATION Federal IrP-406 - Plastics, Organic, General Specifications, Test Met
3、hods STANDARDS Federal Military FED-STD-595 - Colors MIL-STD-109 - Quality Assurance Terms and Definitions Mu-STD-129 - Marking of Shipments 3. REQUIReMENTS 3.1 ble drawings, referenced specifications and the following: General.- All parts shall comply with the requirements of the applica- 3.2 Mater
4、ial.- The material shall consist of polyvinyl chloride resin of high molecular weight, suitably compounded with heat and light stabilizers, a suitable elastomer, lubricants and pigments. al 1 owed No re-grind or scrap will be 3.3 Molded parts.- Parts made in accordance with the applicable drawings s
5、hall be produced by the injection molding method. this document shal be performed after the parts have been maintained at 73“ F for a minimum of 24 hours. All: tests required by 3.3.1 gorkmanshio.- The molded parts shall be uniform in color, free of cracks., burn mrks, flashing and contamination. Su
6、rf ace irregularities result- ing Era cutting of2 sprues and gates shal.1 be removed by grinding and buffing. FSC 1395 Licensed by Information Handling ServicesIL-0-b0540 13 m 777770b 0434506 4 m MEL-0-6Q540 (MU) 3.4 Breaking The minimum breaking load shall be as specified on the applicable drawing.
7、 Heat stability The molded part shall not char, brown or blacken when subjected to 400“ - + 2“ F, for a period of 30 minutes. 3.5 3.6 Acetone resistance.- The molded part shall not flake or delaminate when submerged in acetone for a period of 30 minutes, except within 1/2-inch of cut edges. 3.7 Colo
8、r.- The molded part shall be a light gray, approximately that of Color Number 36270 of FED-STD-595, 3.8 Hidden defects.- When parts which have been inspected, tested and accepted, contain inherent defects subsequently exposed, the contractor may be required to reprace the defective material without
9、additional expense to the Government. 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 specified herein, the supplier may utilize his own fa
10、cilities or any comercial laboratory acceptable to the Government. any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. Except as otherwise specified, The Government reserves the right to
11、 perform 4.1.1 Wality assurance terms and definitions.- Reference shall be made to Ma-STD-109 to define quality assurance terms used. 4.2 any quantity of bands procured under one contract but shall be limited to 5000 or less. then multiple lots shall be employed, each lot being 5000 or less. Lot siz
12、e.- Under this specification, a lot shall be considered to be If the procurement under one contract is greater than 5000 bands, 4.3 inspection provisions. 4.3.1 Molded parts.- Provisions for dimensional and visual inspections are given in the applicable specification for the projectile assembly. 4.3
13、.2 Breaking load.- Ten molded parts per lot shall be subjected to this test but not less than 10 per 5000 parts produced shall be tested. Failure of two or more parts to comply with the requirement of 3.4 shall be cause for rejection of the lot. shall be tested, requirements shall be cause for rejec
14、tion of the lot. if one part fails then an additional 10 parts Failure of one or more of these 10 parts to comply with the 2 Licensed by Information Handling ServicesMIL-0-60540 13 97979Rb 04311507 b 4.3.3 Heat stability,- Ten molded parts per lot shall be subjected to this test, but not less than 1
15、0 per 5000 parts produced shall be tested. Failure of two or more parts to comply with the requiremerat: of: 3.5 shall be cause fog rejection of the lot. shall be tested. raquiaents oha11 be cause for rejection of the lot. If one part fails then an additional 10 parts Failure af one oz more of these
16、 10 parts to comply with the 43 e 4 .- %CS molded part:s par lot ahall be subjected to this test, but not lees than 10 per 5000 parts produced shall be tested. Failure o% two or more parts to comply with the requirment of 3,s shall be cause for rejection of the lote shall be tested, requirento shall
17、 be cause for rejection o% the lot. E one part fails then an add%t%owal 10 parts Failure of one ar more of these 18 parts to comply with the . - Reference shall be made to the applicable projectile r dimensional and iaud inspectiom, 4,402 e- A fixture shall be hyed d hi ch rot%sists 0% two semicircu
18、lar steel discs with a diameter slightly less than that of the band to be tested and with a thickneso of (at least) that o% the band. ration of the outer diameter of the discs shall conform to that sf the inner diameter of the band to be tasted, o roumd disc and the band is then fitted around the fi
19、xtUrea !Che discs shall be attached to the self-aligning grips of a tensile testing machine by means of two suitable harnesses (sea figure I). The band shall be posftioned such that the weld line is at right angles to the direction of pull. ad fixtures in place, the tensile testing machine 1s operat
20、ed at a constant required to break the band will, be recorded as the breaking load, The configu- The fixture is placed together to %om With the band rate of 2eQ ithes pea“ dnaite until the band breaks. &aia EIIIIOU of force 4.4.3 Heat stabillitgo.- The bands shall be placed in a circulating air OVR
21、or cabinet pre-heated to 400“ 2 2 Fe After a perid of 30 minutes, the bands shall be ramed and exmined for evidence of charting, browning or blackening 0% the surface. 4.4.4 e=- he spechen d 0 1/16 inches long, shall be taken from each band. io taken will not 3wclude a gate or weld ae in acetone for
22、 a period of 38 minutes. for evidence of fl&ing or delmimation. The section of the band frm which the specimen %he specimen shall be submerged The spechen shall then be examined 3 Licensed by Information Handling Services4 F 5.2 Packin&.- mless otherwise specified, al% materials shall be packed for
23、domestic shipment. Shipping containers shall be uniform in stze, and shall be designed to inclose the contents in a snug, tight-fitting ftslnner. 5.2.1 - Unless otherwise specified, the mterial shall be paa l comercial corntainers constructed to insure acceptance by cmmopb or other carrier for safe transportation (at the lowest rate) to the point of delivery. 5e3 o- hterior packages and exterior shipping contain- ers shall be marked in accordance with MXL-STD-l%9. Licensed by Information Handling Services. a Licensed by Information Handling Services
