1、3 MIL-C-3407 84 M 7799706 042L49 7 I MIL-C- 83409 (USAF) .-. . 9 February 1973 MILITARY SPECIFICATION COATINGSy VISOR, POLYCARBONATE, FLYING HELMET 1. SCOPE 1.1 Scope. This specification covers the optical and durability requirements for abrasion resisting coatings as applied polycarbonate visors co
2、nforming to MIL-V-43511. 2. APPLICABLE DOCUMENTS 2.1 The following documents of the issue in effect on date of invitation for bids or request for proposal. form a part of this specification to the extent specified herein: SPECIFICATIONS Military MIL-V-435 11 Visors, Flying Helmet y Polycarbonate STA
3、NDARDS Federal FED-STD-406 Plastics, Method of Testing Mi 1 it ary MIL-STD-810 Environmental Test Methods (Copies of specifications, standards, drawings and publications required by suppliers in connection with specific procurement functions should be obtained from. the procuring activity or as dire
4、cted by the contracting officer.) FSC 8415 Obtained From GLOBAL ENGINEERING DOCUMENTS 2625 So.Hickory St. Santa Ana CA 92707 (714)540-9870: (213)624-1216: (dOO1854-7179 Licensed by Information Handling ServicesMIL- C- 83409 (USAI? ) 2.2 Other publications. specification to the extent specified herei
5、n. indicated, the issue in effect on date of invitation for bids or request for proposal shall apply. The following documents form a part of this Unless otherwise AMERICAN SOCIETY FOR TESTING MATERIALS (ASTM) G 23 Weathering of Plastics (Copies of ASTM publications may be obtained from the American
6、Society for Testing and Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103.) 3, REQUIREMENTS 3.1 Preproduction sample. The preproduction sample requirements shall be as specified in MIL-V-43511. 3.2 Design and dimensions. visor shall be as specified in MIL-V-43511, The design and dimensio
7、ns of the coated 3.3 Materials and components 3.3.1 Plastic and spring. Plastic and spring requirements shall be as specified in MIL-V-43511. 3.3.2 Abrasion resistant coating. The coating shall be a clear product which meets the abrasion resistance, zdhesion, and environmental resistance requirement
8、s specified herein. 3.4 Areas of vision. The areas of vision shall be as specified in MIL-V-43511. 3.5 Performance. The coated visor shall meet the requirements as specified in MIL-V-43511. 3.6 Abrasion resistant coating durability 3.6.1 Abrasion resistance. After being subjected to the abrasion tes
9、ts in accordance with Section 4, the increase in haze shall not exceed 3 percent and the decrease in transmittance shall not exceed 4 percent. 3.6.2 Coating adhesion 3.6.2.1 Before and after environmental exposure the .coating shall show no loss in adhesion when tested in accordance with Section 4.
10、2 Licensed by Information Handling ServicesL 3 MIL-C-83409 84 7779906 0428353 7 I MIL-C -83409 (USAF) 3.6.3 Weathering resistance 3.6.3,l The coated visors shall show no yellowing or other change, or loss of coating adhesion. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless
11、otherwise specified in the contract or purchase order, the supplier is responsible for the per- formance of all inspection requirements as specified herein. Except as otherwise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of th
12、e inspection requirements specified herein, unless disapproved by the Government. inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. The Government reserves the right to perform any of the 4.1.1 s
13、hall apply to the coated visors in addition to the provisions stated herein. All of the quality assurance provisions as specified in MIL-V-43511 4.2 Abrasion resistant coating durability 4.2.1 Test specimens. The specimens for conducting the coating durability tests shall be flat panels which are co
14、ated by the same process during and concurrently with the visors. 4.2.2 Abrasion resistance. The haze and luminous transmittance of the coated specimens shall be determined before and after the abrasion.test in accordance with Method 3022 of FED-STP-406. The abrasion test will be performed in accord
15、ance with Method 1092-of FED-STD-406 using CSlOF calibrase wheels for one hundred cycles under a 500 gram load. 4.2.3 Coating adhesion 4.2.3.1 Adhesion test method. The coating is cut or scribed in a cross hatch pattern. A tape, 3M670, is applied to the cross hatched area and firmly pressed down. Th
16、e tape is removed using a snap motion 90 degrees to the test specimen. 4.23.2 The adhesion test shall be applied to the unexposed test spec w&outr any loss of adhesion noted. Test specimens shall be subjected to humidity tests as specified in Method 507 of MIL-STD-810, for 240 hours (10 cycles) and
17、then subjected to the adhesion test. .men 3 Licensed by Information Handling Services4 fr U. S. GOVERNMENT PRIMIF OFFICE: 1973-714-542/4045 . HIL-C-O 84 W 7779906 OL128152 7 I F- z MIL-C-83409 (USAI?) 4.2.4 Weathering resistance. The coated visors shall be exposed in a weatherometer as specified in
18、ASTM G 23, Type E for 100 hours, The coating adhesion test shall be performed after the weatherometer exposure. 5. PREPARATION FOR DELIVERY 5.1 The preparation for delivery of the coated visors shall be in accordance with MIL-V-43511. 6. NOTES 6.1 Intended use. This specification prescribes the requirements for abrasion resisting coatings for visors meeting the requirements Of MIL-V-43511. CUSTODIAN : PREPARING ACTIVITY : Air Force - 11 Air Force - 11 PROJECT NUMBER: 8415-F842 Licensed by Information Handling Services
