1、MIL-F-51110A( EA) AMENDMENT 2 22 September 1986 SUPERSEDING AMENDMENT 1 i4 March i986 MILITARY SPECIFICATION FACEBLANK-LENS, C14R3 This amendment forms a part of MIL-F-51110A(EA), dated 16 November 1976, and is approved for use within the Chemical Research, Development and Engineering Center, Depart
2、ment of the Army and is available for use by all Departments and Agencies of the Department of Defense. PAGE 2 2.1, Under “DRAWINGS“, delete: I- Tester, Leakage, Protective Mask, DOP, m4.“ - ,F“ and substitute: I- Tester, Leakage, Protective Mask, M14.“ 3.3, Rewrite to read as follows: - “3.3 Facebl
3、ank-lens leakage. The overall leakage of the faceblank-lens, before aging and after aging in accordance with 4.4.4.3 for 48 +/- 1 hours instead of 24 hours, (excluding leakage at the faceblank periphery, hose stem, outlet valve stem, and microphone cable stem) shall not exceed 0.003 percent penetrat
4、ion when tested as specified in paragraph 4.4.4.1. 3.4, delete: “after weathering (4.4.4.4)“ and substitute, “after weathering test in accordance with 4.4.4.4.“ 3.5, delete: “3.5 Weathering“ in its entirety. 3.6, add new paragraph as follows: “3.6 Faceblank-lens optical defects. Visual imperfections
5、 of the lens shall not exceed the minimum criteria specified by zone in 4.4.3.4. defects are defined as imbedded particles, scratches, bubbles, or other imper- fections which reduce visibility through the lens.“ Optical I FSC 4240 DISTRIBUTION STATEMENT A. Approved for public release; distribution i
6、s unlimited. 1 of 4 o Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-SLLLOA (2) 92 7777706 0239522 T MIL-F-51110A( EA) AMENDMENT 2 Change paragraph numbers: 3.6 Preproduction sample to 3.7 Preproduction sample. 3.7 Workmanship to 3.8 Workmansh
7、ip. Add new paragraph 3.9 as follows: “3.9 Faceblank-lens bond separation. There shall be no evidence of incom- plete bonding between faceblank and lens.“ PAGE 3 4.3.2 Inspection procedure: Delete: “Test 5 for weathering in accordance with 4.4.4.4 and examine them for compliance with 3.4 and 3.5“, a
8、nd replace with “Test 5 for weathering in accordance with 4.4.4.4 and examine them for compliance with 3.4.“ Delete: “Test 5 after aging for 48 +/- 1 hours in accordance with 4.4.4.1 and then examine them for defects 103 and 105 of 4.4.3.3 (see 4.4.4.3).“, and replace with “Test 5 before aging and a
9、fter aging for 48 +/- 1 hours in accordance with 4.4.4.1 and then examine them for compliance with 3.3 and for defects 103 and 105 of 4.4.3.3 (see 4.4.4.3).“ - PAGE 4 4.4.2.2 For destructive tests, delete: “(3.4 and 3.5)“ and substitute (1 ( 3.4 ) 11. 4.4.3.3: Delete under critical defect: “ 1 Faceb
10、lank-lens leakage before aging 4.4.4.1 and add in its place: “None defined“ 2 o Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-F-5LLLOA (2) 42 m 9971706 0234523 I Critical : Add : 2 MIL-F-SlllOA( EA) AMENDMENT 2 Defects Lens optical defects Ch
11、ange: Major: From: “1 O5 Cement missing or inadequate“ Acceptance Standards 4.4.3.4 To : “i05 Faceblank-lens bond separat ion 4 . 4 . 4.6 From: 11106 Excessive adhesive and/or activator on lens“ To : 11i06 Any adhesive and/or activator on the lens beyond 3/32 inch from the bonded area“ 4.4.3.4, add
12、new paragraph as follows: “4.4.3.4 Optical defects. The areas of vision of the plastic lens shall be examined by zones, as indicated in Figure 2, as follows: Zone A may contain up to an aggregate total of two bubbles, imbedded parti- cles or spots of 1/16 inch diameter or less provided that they are
13、 at least two -p inches apart. Zone A may not contain any scratches, abraded areas, creases or .-+L. other surface imperfections which will interfere with vision. Zone B may contain-up to five bubbles or imbedded particles of 1/16 inch diameter or less provicied that they are scattered in such a man
14、ner that they are at least one inch apart. that they are not longer than i/4 inch and not wider than .O20 inch and they are at least one inch apart. Zone B may contain up to three scratches provided (Applicable to M24 Mask: Zone B may not contain creases and concave con- toured areas with permanent
15、set which distort vision). Zones C and D shall not require examination.“ PAGE 5 4.4.4.6, add new paragraph as follows: “4.4.4.6 Bond separation. The faceblank-lens bond shall be examined by gently rolling the faceblank away fromthe lens and visually inspecting for sep- aration between the lens and f
16、aceblank around the entire periphely of the lens on inside and outside surface.“ Custodian: Preparing activity: Army - EA AIIIY - EA Project No. 4240-A847 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-F-SLLLOA (2) 42 W 9799706 0234524 3 W NIL -F - 5 i i 1 OA( EA) _. AMENDMENT Y - o o W 7- O N I . . . CQ U Z Q N .- . . _. . . . . -. . - _. . ., .: . . . _. . . .I , .- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
