1、NIL-F-5LLOSA (2) 42 m 7779906 0234504 m MIL-F-51109A( EA) AMENDMENT 2 18 July 1986 SUPERSEDING AMENDMENT 1 i4 March i986 MILITARY SPECIFICATION FACEBLANK, CHEMICAL-BIOLOGICAL MASK, C12R4 This amendment forms a part of MIL-F-51109A( EA) , dated 20 January 1977, and is approved for use within the Chem
2、ical Research, Development and Engineering Center, Department of the Army and is available for use by all Departments and Agencies of the Department of Defense. PAGE 2 Add to paragraph 2.2 ASTM standards: “D 1925 - Yellowness Index of Plastics“. PAGE 4 Replace paragraph 3.2.2 “Test Slabs“ with the f
3、ollowing: “3.2.2 Test slabs and equivalent cure. Test slabs shall be molded from stock representative of the formulation used for preproduction sample and from each sublot during regular production of faceblanks in accordance with ASTM D 3182. faceblanks. formance with table I at a given cure time a
4、nd temperature and that the percent free sulfur of the slab and the part are equivalent. Objective evidence shall be submitted in accordance with 4.1.2.3. are established, they may not change during production.“ The slabs shall have a cure equivalent to that of regular production Equivalent cure is
5、established when physical properties are in con- Once cure time and cure temperature Paragraph 3.3.1: Delete “There shall be no- visual discloration of lenses“ and replace with the following: “The average yellowness index of the lenses, when tested in accordance with AS?M D 1925, shall be no more th
6、an 14. and no individual specimen shall be more than 16.“ FSC 4240 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. 1 of 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-51107A (2) 42 M 7779706 0234505 T MIL-F-
7、 5 llOgA( EA) AMENDMENT 2 PAGE 7 Add the following new paragraph 4.1.2.3: “4.1.2.3 Equivalent cure. After date of award of contract, and prior to submission of preproduction, and without additional cost to the Government, the contractor shall submit the information listed below which will constitute
8、 evidence for establishing equivalent cure for a given formulation at optimal cure time and cure temperature for each mold used in the contract. (a) Different combinations of cure time and temperatures for slabs and parts, approaching and surpassing optimum cure shall be furnished. (b) Percent free
9、sulfur for slabs and parts shall be furnished for each time/temperature combinations. (c) Al2 physical property data from table I shall be generated for slabs and shall be furnished for each time/temperature combination. addition, any physical property data from table I which can be generated for fa
10、ceblanks shall be furnished for each time/temperature combination. In (d) Any other information and data which substantiates the equivalency of cure at the established cure time and cure temperature. Custodian: Army - EA Preparing activity: Army - EA Project No. 4240-A853 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
