1、. - - flIL-G-17qB bb m 77777Ob 0323882 O m F- 27-23 “G-1 74B 5 December 1986 SUPERSEDING Mm1 74A 5 November 1963 e MILITARY SPECIFICATION GLASS, OpllICAL This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification establ
2、ishes the requirements for optical glass to be used in the fabrication of optical elements. Requirements for special, class 2 (nonstandard), glass will be in accordance with thecontract or purchase order. 1.2 Classification. Optical glass shall be of the following classes, grades, and forms (see 6.2
3、) : Class 1 - Standard Class 2 - Special Grades - A, B, C, D (striae content) Forms - Plates, slabs, formed pressings. e 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards and handbooks. Unless otherwise specified, the following specifications, standards, and handbooks
4、 of the issue listed in that issue of the De artment of Defense Index of Specifications and Standards (DoDISS P specified in the solicitation form a part of this specification to the extent specified herein. SPECIFICATIONS ma PPP-B-601 - Boxes, Wood, Cleated Plywood. PPP-B-621 - Box, Wood, Nailed an
5、d Lock-Corner. PPP-B-636 - Box, Shipping, Fiberboard. PPP-C-1752 - Cushioning Material, Packaging, Unicellular . Polyethylene Foam, Flexible. PPP4-1797 - Cushioning Material, Resilient, Low Density, Unicellular, Polypropylene Foam. Beneficial comments (recommendations, additions, deletions) and any
6、pertinent data which may be of use in improving this document, should be addressed to: Commander, us Army Armament, Research and development Center, ATTN: SMCAR-ESC-AS, Dover, New Jersey 07801-5001 by using the self-addressed . Standardization Document Improvement Proposal (DD Form 1426) appearing a
7、t the end of this document or by letter. K AMSC NIA THIS DOCUMENT CONTAINS 16 PAGES. psc 6650 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. /- , Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-374B 66 9979906
8、 0323883 2 m MILG-I 74B MILITARY MILP-116 MIL-0-1-30 MIL-P-17667 MIL-1-4.5208 STANDARDS MILITARY MWTD-1 O5 “STD-1 29 “STD-2073 - Preservation, Methods of. Optical Compnents for Fire Control Instruments; General Specification Governing the Manufacture, Assembly and Inspection of. (Noncorrosive) . Ins
9、pection Systems Requirements. - Paper , Wrapping, Chemically Neutral Sampling Procedures and Tables for Inspection by Attributes. Marking for Shipment and Storage. Application of Packaging Requirements. - DoD Material Procedures for Development and 2.1.2 Other Government documents. The following oth
10、er Government documents form a part of this standard to the extentspecified herein: CODE OF FEDERAL EI“PI0NS Nuclear Regulatory Commission, Rules and Regulations Title 10 - Chapter I, Part 40. (Application for copies should be addressed to Superintendent of Documents, U.S. Government Printing Office
11、, Washington, DC 20402.) Copies of specifications, standards, drawings, publications and other Government documents required by contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer. 2.2 Other publicat
12、ions. The following documents form a part of this standard to the extent specified herein. Unless otherwise specified, issues of documents which are DOD adopted shall be those listed in the issue of the DODISS specified in the solicitation. Issues of documents which have not been adopted shall be th
13、ose in effect on the date of the cited DODISS. Asm ASTM D 3951 - Standard Practice for Commercial Packzging. (Application for copies of ASTM publications should be addressed to ASTM, I91 6 Race Street , Philadelphia, PA 191 03) (Industry below 1 .m, + 0.0010; from 1.600 to 1 .m, + 0.0015; and above
14、1 .m, + 0.0020. - - - 3 - -. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-L74B bb W 7777qOb 0323885 b I 3.3.5 Abbe constant. Standard glass shall have the Abbe constant correctly identified to the first decimal place, and shall conform to th
15、e nominal value Specified in the contract within the following tolerances: below P, + 0.2; from 30 to 45, + 0.3, between 45 and 55, 2 0.4; over 55, 2 0.5.- - 3.3.6 Partial dispersions. Standard glass shall conform to the partial dispersion values specified in the contract. 3.3.7 Strain. Distribution
16、 of permanent strain in standard glass shall be symmetrical, and the birefringence resulting from permanent strain shall not produce more than 10 millimicrons relative retardation or path difference per centimeter of transmitted sodium D light. 3.3.8 Striae grade requirements. Standard glass shall c
17、onform to Grade A, B, C or D as specified herein and in the contract. 3.3.8.1 Grade A. Grade A glass shall contain no visible striae, streaks, or cords when tested in accordance with methods specified herein. 3.3.8.2 Grade B. Grade B glass shall contain only striae which are light and scattered when
18、 viewed in the direction of maximum visibility and which are just above the limit of visibility when tested in accordance with methods specified herein. 3.3.8.3 Grade C. Grade C glass shall contain only striae which are light when viewed in the direction of maximum visibility, and are parallel to th
19、e face of the plate when tested in accordance with methods specified herein. 3.3.8.4 Grade D. Grade D glass shall contain more or heavier striae than contained in grade C. Striae shall be parallel to the face of the plate when tested in accordance with methods specified herein. 3.3.9 Required certif
20、ied samples. The contractor shall prepare two sets of samples representing strain and grades of striae. These samples shall be submitted by the contractor to the activity specified herein for approval as certified calibrated samples (see 6.2). Approved samples wili be returned to the contractor for
21、use as inspection standards on present and future contracts. 3.3.10 Inclusions. Inclusions may be nmerically classified from O to 50 as indicated in table I. The permissible total cross-section in (m2) per 100 (cd) volume resulting from the sum of all cross-sections. in that volume shall be as speci
22、fied in table I. The permissible number of maximum size inclusions shall be one per each cubic centimeter (cc) of glass provided the resulting cross-section, as specified in table I, is not exceeded. Inclusions smaller than the minimum size shall be disregarded. 3.3.10.1 MaAimum size inclusion. Maxi
23、mum permissible size of inclusions shall be as specified in table I. 3.3.10.2 Minimum size inclusion. Minimum size inclusions to be considered in evaluating the quanti of inclusions shall be as specified in table I. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without licen
24、se from IHS-,-,-MIL-G-L7qB h6 W 9999906 OL2388b 8 W “G-174B TABU3 I. Inclusions vs. cross-section area. Inclusion Maximum total no. cross-sec . area mm2/1oocII3 O 0.20 5 O. 50 3 O. 25 2 o. 12 1 0.03 10 0.80 15 1 .m 20 3-1 5 30 7.10 40 12.60 50 19.70 Maximum size millimeter (mm) millimeter (m) diamet
25、er diameter Minimum size O. m 0.03 o. 10 0.02 O. 0.06 0.80 0.06 0.57 0.06 O= 39 0.06 0.10 O. 50 o. 10 0.40 0.10 0.30 0.05 O. x 0.05 0.15 3.3.11 Finish. Laps, folds, stones and fire cracks on formed pressings shall not be deeper than one-half thegrinding stock specified in the applicable drawing or a
26、+k detailed in table II, and shall not be so discolored as to interfere with the index of refraction measurement. TABLE II. Finish. Edging stock Grinding stock Reticles, window As specified in drawing and contract. d 127.0 mm 1.5, “0.5 mm 2.5, “0.5 mm d 127.0 mm 1.5, +I .o mm 7.9, +I .o mm When rs 2
27、54.0 mm 1.5, +I .o mm 6.1, +1.0 mm I Prisms: Having all dimensions of 1 01.6 mm or less. Surface other than hypotenuse or clay. motenuse or clw surface Any dimensions over 106.6 m 2.5, “0.8 mm 4.6, +I .O mm As specified in drawing or contract. r= radius, rs= shorter radius, d= diameter = greater tha
28、n or equal to 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-G-37YB 66 m 7779906 0323887 T W “G-1 74B 3.3.12 _. I%J.Y. Class 1 optical glass shall be supplied to the form specified in the contract. 3 3.1 2.1 Plates or slabs. Optical glass of t
29、his form shall be flat and reasonably square or rectangular, with sides not less than 50 m or greater than 304 ran thick. If the width is no greater than 160 m, then length up to 575 mm shall be permitted. 3.3.12.1 -1 Dimensions. Optical glass in the form of plates or slabs shall have the thickness
30、specified in the contract within the following tolerances: up to and including 20 m thick, minus O to 2 mm; over X) mm thick, minus O to plus 4. 3.3.12.1 2 Length. Length of usable glass shall not be less than 95 percent of the total length of the plate or slab. 3.3.12.1 .3 Fractures. Vented. fractu
31、res exceeding one centimeter in length and aiming toward the center of the plate shall be cause for rejection. Pressure or fire cracks deeper than 0.5 millimeter shall be cause for rejection. 3.3.12.2 Formed pressings. Optical glass of this form shall have the dimensions as specified in the drawing
32、or contract. 3.3.12.2.1 Additional material. When drawings or finished optical elements are furnished, additional material for.grinding stock shall be added to the dimensions of the finished elements. Surface stock for lens of prism blanks shall be measured from the lowest point of the “sink, i*e ,
33、the depression on the upper molded surface created by the cooling of the blank, Unless otherwise specified n the drawings, additional material for grinding stock shall be added as shown in table II. 3-4 class 2 - special. Detail requirements for special glass shall be as specified (see 6.2). 3.5 Wor
34、kmanship All glass shall be fabricated and finished in a thorough, workmanlike manner and all manufacturing and processing operations shall be correctly performed. Glass shall be clean and free of burrs, cracks, chips, grease, or oil (except where specifically required). All required markings shall
35、be neat, legible, and sharply defined. 4. QUALITY ASSITRANCE, 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 as specified herein. Except as otherwise specified
36、 in the contract or purchase order ,- mppliers may use their own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government. The Goeernment reserves the right to perform any of the inspections set forth in the specificat
37、ion where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.1 .I General provisions Quality assurance provisions of this specification and of other documents referenced herein form the basis for inspection to be performed by the supplier Insp
38、ection shall be in 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-“G-I 74B accordance with the requirements of MILI-45208 and MIN-13830. 4.2 Inspection provisions. 4.2. I Inspection lot. Unless otherwise specified by the contracting officer, inspe
39、dtion lot size, formation, and presentation of lots shall be in accordance with Tubmission of Product“ as defined in MIL-STD-1 05. Optical glass produced by the pot method shall be considered a lot resulting from each melt and annealing. When a lot is not identifiable from a melt, or the optical gla
40、ss is produced by the continuous process, the lot shall not consist of more than 503 pounds of material offered for delivery at one time. 4.2.2 Conformance inspection. Conformance inspection shall be performed for all requirements specified in sections 3 and 5. 4.2.2.1 Plates, slabs or formed pressi
41、ngs. Unless otherwise specified, 100 percent inspection shall be performed for all requirements herein. Rejection of more than 10 percent by weight of a specific lot shall be cause for rejection of the entire lot. 4.2.2.2 Sampling. 4.2.2.2.1 Melts. When glass is produced by the melts method, one sam
42、ple representing the lot (melt) shall be used for acceptance inspection. 4.2.2.2.2 Continuous process. When glass is produced by the continuous process, five samples shall be drawn for acceptance inspection from each lot produced (see 4.2.1 ) unless otherwise specified (see “Note“ under 4.4.4). 4.2.
43、2.3 Requirements and test procedures. Table III lists characteristics, requirements, and tests constituting conformance inspection of optical glass covered by this specification. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-“G-1 74B TABIZ III. R
44、equirements and tests Characteristics Materials Color Absorption Radioactive material Class requirements !Type name and number Index of refraction Abbe constant Partial dispersions Strain Striae (Grades A, B, C, and. : Required samples (standards) Inclusions Finish Form Plates or slabs Dimensions Le
45、ngth Fractures Formed pressings Additional material Class 2 - special. Workmanship lequireaent 3.1 3.1 .I 3.1 -2 3.1 03 3.2 3.3.2 and 3.3.3 3.3.4 3.3.5 3,306 3.3.7 3.3.8.1 to 3.3.8.4 3.3.9 and 6.2 3.3.10, 3.3.10.1,and 3.3.10.2 w/table I 3.3.11 (w/table 11) 3.3.12 3.3.12.1 3.3.12.1 .I 3.3.12.1.2 3.3.
46、12.1.3 3.3.12.2 3.3.12.2.1 3.4 and 6.2 3.5 8 Test procedure Visual 4.4.1 4.4-2 4.4.10 Visual Visual 4.4.3 4.4.4 4.4.4.1 4.4.5 4.496 4.4-7 4.4.8 4.4.9 Per contract Std. meas. m Visual-SPIE Visual-SME Visual-SME Visual- contract Visual Provided by IHSNot for ResaleNo reproduction or networking permitt
47、ed without license from IHS-,-,-.S MIL-G-LiLIB 66 m 7977906 0123890 T W MIW174B 4.2.2.4 Disposition of nonconforming product. Rejected lots shall be screened for al1 defective characteristics. Removal or correction of defective units and resubmittance of rejected lots shall be in accordance with “Ac
48、ceptance and Rejection“ as specified in MILSTD-105. 4.3 Inspection equipment. Except as otherwise provided in the contract, the contractor shall furnish and maintain all required measuring and testing equipment in accordance with the “Inspection Equipment“ requirement of MIL-1-45208. The Government
49、reserves the right to use the test equipment for its own independent inspections to the extent that such use will not unduly interfere with the contractors delivery schedule. 4.3.1 Government furnished inspection equipment. Where the contract provides for Government furnished test equipment, care and maintenance of that equipment shall be in accordance with Equipment“ and lGovernment Furnished Material“ requirements of MILI-452
