1、METRICBeneficial comments (recommendations, additions, deletions) and any pertinentdata which may be of use in improving this document should be addressed to:Department of the Navy, Naval Sea Systems Command, SEA 05Q, 2531 JeffersonDavis Highway, Arlington, VA 22242-5160, by using the Standardizatio
2、n DocumentImprovement Proposal (DD Form 1426) appearing at the end of this document orby letter.MIL-PRF-24794A24 May 2001SUPERSEDINGMIL-PRF-2479425 MAY 1995PERFORMANCE SPECIFICATIONMATERIAL, INDEX MATCHING, FIBER OPTICSThis specification is approved for use by allDepartments and Agencies of the Depa
3、rtment of Defense.1. SCOPE1.1 Scope. This specification covers the requirements of an index matchingmaterial for use in fiber optic mechanical splices (for example, MIL-S-24623/4).2. APPLICABLE DOCUMENTS2.1 General. The documents listed in this section are specified insections 3 and 4 of this specif
4、ication. This section does not includedocuments cited in other sections of this specification or recommended foradditional information or as examples. While every effort has been made toensure the completeness of this list, document users are cautioned that theymust meet all specified requirements d
5、ocuments cited in sections 3 and 4 ofthis specification, whether or not they are listed.2.2 Government Documents.2.2.1 Specifications, standards, and handbooks. The followingspecifications, standards, and handbooks form a part of this document to theextent specified herein. Unless otherwise specifie
6、d, the issues of thesedocuments are those listed in the issue of the Department of Defense Index ofSpecifications and Standards (DoDISS) and supplement thereto, cited in thesolicitation (see 6.2).HANDBOOKSDEPARTMENT OF DEFENSEMIL-HDBK-454 - General Guidelines for Electronic Equipment(Unless otherwis
7、e indicated, copies of the above specifications, standards,and handbooks are available from the Standardization Document Order Desk, 700Robbins Avenue, Building 4D, Philadelphia, PA, 19111-5094.)AMSC N/A FSC 6070DISTRIBUTION STATEMENT A. Approved for public release; distribution isunlimited.Provided
8、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24794A2 2.3 Non-Government publications. The following documents form a part ofthis document to the extent specified herein. Unless otherwise specified, theissues of the documents which are DoD adopted
9、are those listed in the issue ofthe DoDISS cited in the solicitation. Unless otherwise specified, the issuesof documents not listed in the DoDISS are the issues of the documents cited inthe solicitation (see 6.2).AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)ASTM D542 - Standard Test Method for I
10、ndex of Refraction ofTransparent Organic Plastics. (DoD adopted)ASTM D570 - Standard Test Method for Water Absorption of Plastics.(DoD adopted)(Application for copies should be addressed to the American Society forTesting and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.)ELECTR
11、ONICS INDUSTRIES ASSOCIATION/TELECOMMUNICATIONS INDUSTRY ASSOCIATION(EIA/TIA)TIA/EIA-455-56- Test Method for Evaluating Fungus Resistance ofOptical Fiber and Cable. (DoD adopted)(Application for copies should be addressed to the TelecommunicationsIndustry Association, 2500 Wilson Boulevard, Arlingto
12、n, Virginia, 22201.)(Non-Government standards and other publications are normally available fromthe organizations that prepare of distribute the documents. These documentsalso may be available in or through libraries or other informationalservices.)2.4 Order of precedence. In the event of a conflict
13、 between the text ofthis document and the references cited herein, the text of this document takesprecedence. Nothing in this document, however, supersedes applicable laws andregulations unless a specific exemption has been obtained.3. REQUIREMENTS3.1 Acquisition requirements. The individual item re
14、quirements shall be asspecified herein and in accordance with the acquisition documents. In theevent of any conflict between the requirements of this specification and theacquisition documents, the latter shall govern.3.2 First article. When specified (see 6.2), a sample shall be subjectedto first a
15、rticle inspection (see 6.3) in accordance with 4.4.3.3 Materials. The index matching material shall not produce toxic,corrosive, or explosive byproducts. The material is subject to atoxicological data and formulations review and inspection, for safety of thematerial, by the Government.3.3.1 Recycled
16、, recovered, or environmentally preferable materials.Recycled, recovered, or environmentally preferable materials should be used tothe maximum extent possible provided that the material meets or exceeds theProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-
17、,-,-MIL-PRF-24794A3 operational and maintenance requirements, and promotes economicallyadvantageous life cycle costs.3.4 Composition. The index matching material shall be chemically stableover the specified operating and storage temperature ranges.3.5 Performance requirements. The performance requir
18、ements shall bedefined in terms of the mechanical, environmental, and chemical properties.3.5.1 Appearance (see 4.6.1). The index matching material shall be clearand transparent.3.5.2 Index of refraction (see 4.6.2). The index matching material shallhave an index of refraction of 1.46 0.01.3.5.3 She
19、lf life (see 4.6.3). The index matching material shall have ashelf life not less than 36 months at 25OC5OC (see 6.6). The 36 monthperiod commences on the date of the adhesive manufacture. The index matchingmaterial shall meet the requirements of 3.5.1 and 3.5.2.3.5.4 Storage temperature (see 4.6.3).
20、 The index matching material shallmeet the requirements of 3.5.1 and 3.5.2 after storage.3.5.5 Operating temperature (see 4.6.4). The index matching material shallmeet the requirements of 3.5.1 when exposed to operating temperature extremesbetween -28OC and +85OC.3.5.6 Flow resistance (see 4.6.5). T
21、he index matching material shall notflow at elevated temperatures. During the flow resistance test, uniformdisplacement of the entire index matching material sample (as contrasted withthe flow of material) is not considered a failure.3.5.7 Water absorption (see 4.6.6). The index matching material sh
22、all meetthe requirements of 3.5.1.3.5.8 Identification and marking (see 4.6.7). All containers shall bemarked. The markings shall be permanent and clearly visible and legible.Marking information shall include the Part or Identifying Number (PIN), CAGEcode, manufacturers name, and date of manufacture
23、.3.5.9 Workmanship (see 4.6.8). All index matching material shall beuniform in color and free from dirt, metallic particles, and other foreignmaterial or any quality defects detrimental to the performance of thematerial.3.5.10 Fungus Resistance (see 4.6.9) When tested in accordance with 4.6.9,index
24、matching materials shall show sparse or very restricted microbial growthand reproduction with minor or inhibited substrate utilization. There shallbe little or no chemical, physical, or structural change detectable.3.6 Shipping. Index matching material shall not be shipped on any order tothis specif
25、ication if the shipping date is greater than 12 months from themanufacturing date.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24794A4 4. VERIFICATION4.1 General. Material delivered to this specification shall meet allrequirements herein.
26、The manufacturer shall perform the necessary tests andinspections in order to insure compliance with this specification.4.1.1 Test equipment and inspection facilities. Requirements for testequipment and inspection facilities shall be as identified in the contract(see 6.3.1).4.2 Classification of ins
27、pections. The inspection requirements specifiedherein are classified as follows:a. First contract inspection (see 4.3).b. First article inspection (see 4.4).c. Conformance inspection (see 4.5).4.3 First contract inspection. First contract inspection (see 6.4.1) isapplicable only on the first acquisi
28、tion of a particular product under thisspecification. First contract inspections (see 6.4.1) shall consist of thetests listed in table I and shall be conducted in conjunction with firstarticle inspections. The material submitted for testing shall berepresentative of the production process.4.3.1 Samp
29、le. The sample submitted shall be a number of units of the samePIN sufficient to complete all of the inspections.4.3.2 Inspection routine. The sample shall be subjected to the inspectionsspecified in table I. The tests identified in table I may be performed at thesame time as the tests identified in
30、 table II.4.3.3 Failures. One or more failures shall constitute first contractinspection failure.TABLE I. First contract inspection.Inspection Requirement Test Sample sizeFungus 3.5.10 4.6.9 1/1/ Three specimens shall be used from the first contract sample.4.4 First article inspection. First article
31、 inspection shall consist ofall the tests listed in table II. The material submitted for testing shall berepresentative of the production process.4.4.1 Sample. The sample submitted shall be a number of units of the samePIN sufficient to complete all of the inspections.4.4.2 Inspection routine. The s
32、ample shall be subjected to the inspectionsspecified in table II. The tests identified in table I may be performed atthe same time as the tests identified in table II.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24794A5 4.4.3 Failures. One
33、 or more failures shall constitute first articleinspection failure.TABLE II. First article inspection.Inspection Requirement Test Sample sizeIdentification andmarking3.5.8 4.6.7 All unitsWorkmanship 3.5.9 4.6.8 All unitsAppearance 3.5.1 4.6.1 All unitsIndex of refraction 3.5.2 4.6.2 1/Shelf life 3.5
34、.3 4.6.3 2/Storage temperature 3.5.4 4.6.3 3/Operating temperature 3.5.5 4.6.4 1/Flow resistance 3.5.6 4.6.5 1/Water absorption 3.5.7 4.6.6 1/1/ Three specimens shall be used from units selected at random from the firstarticle sample.2/ Nine specimens shall be used from units selected at random from
35、 the firstarticle sample.3/ The same specimens shall be used as are used in the shelf life inspection.4.5 Conformance inspection. Conformance inspection shall consist of theinspections and tests specified for group A inspection (table III), Group Binspection (table IV), and Group C inspection (table
36、 V), as specified (see6.2). Requirements for alternate forms of conformance inspection shall be asidentified in the contract (see 6.3.2).4.5.1 Group A inspection. Group A inspection shall consist of the testslisted in table III conducted in the order shown.TABLE III. Group A inspection.Inspection Re
37、quirement TestIdentification andmarking3.5.8 4.6.7Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24794A6 4.5.1.1 Sampling plan. Group A inspections shall be performed on 100percent of the product supplied under this specification.4.5.1.2 Fai
38、lures. One or more failures shall constitute group A inspectionfailure of the sample unit.4.5.1.3 Disposition of sample units. Samples that have failed group Ainspection shall not be shipped or submitted for group B testing.4.5.2 Group B inspection. Group B inspection shall consist of the testsliste
39、d in table IV conducted in the order shown. Group B inspection shall bemade on sample units that have passed group A inspection.TABLE IV. Group B inspection.Inspection Requirement TestWorkmanship 3.5.9 4.6.8Appearance 3.5.1 4.6.14.5.2.1 Sampling plan. Three sample units shall be selected from each l
40、otof material supplied under this specification.4.5.2.2 Failures. One or more failures shall constitute group B inspectionfailure of the lot.4.5.2.3 Rejected lots. Requirements regarding the rework of rejected lotsshall be as identified in the contract (see 6.8.1).4.5.2.4 Disposition of sample units
41、. Samples that have failed group Binspection shall not be shipped or submitted for group C testing.4.5.3 Periodic inspection. Periodic inspection shall consist of group Cinspection. Except where the results of these inspections show noncompliancewith the applicable test requirements (see 4.5.3.1.4),
42、 delivery of productswhich have passed group B shall not be delayed pending the results of thesefirst article verification inspections.4.5.3.1 Group C inspection. Group C inspection shall consist of theinspections specified in table V in the order shown. Group C inspectionsshall be made on units tha
43、t have passed the group B inspection.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24794A7 TABLE V. Group C inspection.Inspection Requirement TestIndex of refraction 3.5.2 4.6.2Shelf life 3.5.3 4.6.3Storage temperature 3.5.4 4.6.3Operating
44、temperature 3.5.5 4.6.4Flow resistance 3.5.6 4.6.5Water absorption 3.5.7 4.6.64.5.3.1.1 Sampling plan. Every 60 months, a number of units of the samePIN, sufficient to complete all of the inspections, which have passed group Binspection, shall be selected.4.5.3.1.2 Failures. One or more specimen or
45、sample unit failures shallconstitute group C inspection failure.4.5.3.1.3 Disposition of sample units. Sample units that have beensubmitted to group C inspection shall not be shipped4.5.3.1.4 Noncompliance. Requirements regarding failure of group Cinspection shall be as identified in the contract (s
46、ee 6.8.2).4.6 Methods of inspection.4.6.1 Appearance (see 3.5.1). The index matching material shall be placedbetween two microscope slides and formed into a layer with a thickness ofapproximately 0.5 mm (0.02 inch). The material shall be visually inspectedfor conformance to 3.5.1.4.6.2 Index of refr
47、action (see 3.5.2). The index matching material shallbe tested using an Abbe refractometer and a sodium light source, or equivalent(refer to ASTM D542 for guidance).4.6.3 Shelf life/storage temperature (see 3.5.3 and 3.5.4). The indexmatching material shall be exposed to a temperature of +85OC2OC fo
48、r 240hrs. After exposure, the material shall be subjected to the tests specifiedin 4.6.1 and 4.6.2.4.6.4 Operating temperature (see 3.5.5). The index matching material shallbe prepared as specified in 4.6.1 and subjected to the temperatures anddurations specified in table VI. The humidity shall be c
49、ontrolled during thetemperature reduction and the low temperature exposure steps to eliminate theformation of frost on the material. The index matching material shall bevisually examined during the high temperature exposure, during the lowtemperature exposure, and after the test for conformance to 3.5.1.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24794A8 TABLE VI. Operating temperat
