1、MIbF-51110A( EA) 16 November 1976 SUPERSEDING MIEF-51110 MU) 19 April i968 MILITARY SPECIFICATION FACEBLANK-LENS , C14R3 This specification is approved for use by Edgewood Arsenal, Department of the Army, and is available for use by all Depart- ments and Agencies of the Department of Defense. 1. SCO
2、PE 2.1 Scope. This specification covers a chemical-biological mask faceblank-lens assembly ( see 6.1) . 1,2 Classification. The faceblank-lenses shall be of the following sizes, as specified (see 6.2): Small (small faceblank) Medium (medium faceblank) 2. APPLICABLE DOCUMENTS 2.1 Government documents
3、. 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: STANDARDS FEDERAL FED-STD-123 - Marking for Shipment (Civil Agencies ) . FED-601 - Rubber; Sampling and Testing. MILITARY MIL-STD-
4、105 - Sampling Procedures and Tables for Inspection by Attributes . FSC 4240 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-5LLLOA 42 7777706 023452b 7 I - MIL-Fg51110A( EA) DRAWINGS US ARMY -NT COMMAND EDGENOOD ARSENAL D5-2-1593 - Faceblank-l
5、ens , C14R3. DLl36-42-750-1 - Tester, Leakage, Protective Mask, DOP, MI.4, (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 directed by the contracting of- f
6、icer. ) 3. REQUIREMENTS 3.1 Materials and components. Ail materials and components shall conform to Drawing D5-2-1593 and the subsidiary drawings listed thereon. 3.2 Assembly. The faceblank-lens shall be assembled as specified on Dmwing D5-2-1593. 3* 3 Faceblank-lens leakage. The overall leakage of
7、the faceblank-lens , before and after aging, (excluding leakage at the faceblank periphery, hose stem, outlet valve stem, and microphone cable stem) shall not exceed 0.003 percent DOP smoke penetration when tested as specified in paragraph 4.4.4.1, 3.4 Faceblank-lens adhesion. The average strength o
8、f the faceblank-lens bonds, before and after aging (4.4,4.3), after weathering (4.4.4.4), and after-exposure to low temperature (4.4.4.5) , shall be no less than 30 pounds per linear inch width, and no individual specimen shall be less than 25 pounds, when tested as specified in 4.4.4.2. of the lens
9、 when tested as specified in 4.4.4.4. 3.5 Weathering. The faceblank-lens shall show no Visual discoloration 3.6 Preproduction sample. Prior to the start of regular production and following any change in regular production methods, material, or equipment, a preproduction sample of faceblank-lenses sh
10、all be produced in accordance with this specification for examination and test (see 4.3) . The faceblank-lens shall be free from contamination damage such as permanent set of rubber, cuts, cracks, tears, and scratched or distorted lens. any defects which might affect vision or visibility, Au. mask l
11、enses shall be free from 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-mL-F-51110A( EA) 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. 4.1.1 Suppliers responsibility. Unless otherwise specified in the contract or purchase orde
12、r, the supplier is responsible for the performance 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 the inspection requirements specified herein, unless dis
13、approved by the Government. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to specified requirements. 4.1.2 Objective evidence. The supplier shall provide objective
14、 evidence acceptable to the contracting officer that the requirements of 3.1 and section 5 for which specific inspection has not been provided in this specification have been satisfied. 4.2 Classification of inspections . The inspection requirements specified herein are classified as follows : (a) P
15、reproduction inspection (see 4.3) (b) Quality conformance inspection (see 4.4) 4.3 Preproduction inspection. 4.3.1 Sample. Prior to the start of regular production and following any change in regular production methods, material, or equipment, a pre- production sample of 100 faceblank-lenses shall b
16、e produced using the same methods, materials, and equipment as will be used during regular production. 4.3.2 Inspection procedure. The entire preproduction sample shall be examined for all of the characteristics in 4.4.3.3 and if no failure occurs then the faceblank-lenses shall be tested as follows
17、: test 5 before aging and after aging in accordance with 4.4.4.2. Test 5 after aging for 48 + 1 hours in accordance with 4.4.4.1 and then examine them for defects 103 nd io5 of 4.4.3.3 (see 4.4.4.3). 4.4.4.4 and examine them for compliance with 3.4 and 3.5. temperature in accordance with 4.4.4.5 and
18、 examine them for compliance with Test 5 for weathering in accordance with Test 5 for low 3.4. 4.3.3 Acceptance/rejection criteria. Failure of any faceblank-lens to pass the above tests shall reject the preproduction sample. The supplier shall obtain written approval from the contracting officer bef
19、ore proceeding with reguiar production. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-F-SLLLOA 42 M 7777706 0234528 O W . 4.4 Quality conformance inspection. 4.4.1 Lotting, A reguiar production lot shall consist of the faceblank- lenses produ
20、ced by one manufacturer, from the same materials and under essentially the same manufacturing conditions. lot of faceblanks or one lat of lenses shall be represented in any one lot of finished faceblank-lenses, However, no more than one 4.4.2 Sampiing, 4.4.2.1 For nondestructive examination. Samplin
21、g shall be conducted in accordance with MIL-STD-105. 4,4.2,2 For destructive fests. Sampling for destructive tests (3.4 and 3.5) shall be condced in accordance with MIL-STD-105, level S-3. 4.4 . 3 4.4,3.i For examination, Sample faceblank-lenses shall be examined Inspection procedure in accordance w
22、ith the- classification of defects and MIL-STD-105 . 4.4.3.2 For destructive tests. Swle shall be tested in accordance with 4.4.4 and with MIL-STD-105, level 5-3, AQL 0.65 percent defective. 4.4.3,3 Classification of defects. (a) Faceblank-lens , C14R3 (Dwg D5-2-1593) . Categories Defects Acceptance
23、 standards *Crie i cal : 1 Faceblank-lens leakage before aging 4.4.4.1 MaJor: AQL 0.65 percent defective 101 Component missing, incorrect, or 102 Damage (3.7) 10 3 Permwent set 10 4 Workmanship 105 Cement missing or inadequate i06 Excessive adhesive and/or activator . incorrectly assembled on vinyl
24、chloride lens 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4.4.4 Tests. 4.4 . 4.1 Faceblank-lens leakage . Faceblank-lens leakage shall be de- Faceblank-lens adhesion shall be termined using the Ml.4 Gas Mask Leakage Tester (DL 136-42-750-1.) .
25、4.4 . 4 . 2 Faceblank-lens adhesion. determined in accordance with Method 43ll of Fed. Test Method Std. No. 601 except that the test specimen shall be rectangular 1.00 + 0.01 inch wide by 3 to 4 inches long, consisting of approximately half yens and half faceblank material with the length of the spe
26、cimen perpendicular to the faceblank-lens seam. The specimen shall be placed in the testing machine with the jaws no less than one inch from any part of the seam and the Jaw separation rate shall be 12.0 2 0.5 inches per minute. shall be cut from each sample faceblank-lens. 4.4.4.3 Aging. SpecSmenc
27、selected for aging, shall be suspended with- Four test specimens out distortion at i67O - + 2F for 24 hours, testing . Cool to room temperature before 4.4.4.4 Weatherin U. S. GOVERNMENT PRINTING OFFICE 1976-703-020/264 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
