1、I I MIL-PRF-24792A 1 October 1999 SUPERSEDING 31 May 1995 MIL-A-24792 PERFORMANCE SPECIFICATION ADHESIVE, EPOXY, TWO PART, FIBER OPTICS This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agencies of the Dep
2、artment of Defense. 1. SCOPE 1.1 Scope. This specification covers the requirements of a 100 percent solid epoxy adhesive for bonding optical fibers to metal and ceramic fiber optic connector and terminus ferrules. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specifie
3、d in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that the
4、y must meet all specified requirements documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the exten
5、t specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS FEDERAL QQ-A-250/4 - Aluminum Alloy, 202
6、4, Plate and Sheet. (Unless otherwise indicated, copies of the above specifications, standards, and handbooks are available from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA, 19111-5094.) Beneficial comments (recommendations, additions, deletions) and an
7、y pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 05Q, 2531 Jefferson Davis Highway, Arlington, VA 22242-5160 by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this documen
8、t or by letter. AMSC N/A FSC 6070 Distribution Statement A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24792A 2.3 Non-Government publications. The following documents form a part of
9、 this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DoD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of documents
10、 cited in the solicitation (see 6.2). AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D542 - Standard Test Method for Index of Refraction of ASTM D570 - Standard Test Method for Water Absorption of Plastics. ASTM E595 - Standard Test Method for Total Mass Loss and Collected Transparent Organi
11、c Plastics. (DoD adopted) (DoD adopted) Volatile Condensable Materials from Outgassing in a Vacuum Environment. (DoD adopted) Expansion of Plastics, Between -30 OC and 30 OC. (DoD adopted) ASTM D1002 - Standard Test Method for Strength Properties of Adhesives in Shear by Tension Loading (Metal to Me
12、tal). (DoD adopted) Hardness. (DoD adopted) Related Components. (DoD adopted) Temperature of Reacting Thermosetting Resins. (DoD adopted) Thermosetting Casting Systems During Cure. Polymers by Thermal Analysis. (DoD adopted) ASTM D696 - Standard Test Method for Coefficient of Linear Thermal ASTM D22
13、40 - Standard Test Method for Rubber Property - Durometer ASTM D2393 - Standard Test Method for Viscosity of Epoxy Resins and ASTM D2471 - Standard Test Method for Gel Time and Peak Exothermic ASTM D2566 - Standard Test Method for Linear Shrinkage of ASTM D3418 - Standard Test Method for Transition
14、Temperatures of (Application for copies should be addressed to the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428- 2959. ) ELECTRONIC INDUSTRIES ASSOCIATION/TELECOMMUNICATIONS INDUSTRY ASSOCIATION (EIA/TIA) TIA/EIA-455-5 - Humidity Test Procedure for F
15、iber Optic TIA/EIA-455-71 - Procedure to Measure Temperature-Shock Effects on TIA/EIA-604-2 - FOCIS 2, Fiber Optic Connector Intermateability Components. (DoD adopted) Fiber Optic Components. Standard. (Application for copies should be addressed to the Telecommunications Industry Association, 2500 W
16、ilson Boulevard, Arlington, Virginia, 22201.) (Non-Government standards and other publications are normally available from the organizations that prepare or distribute the documents. These documents may also be available in or through libraries or other informational services. ) 2.4 Order of precede
17、nce. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First articl
18、e. When specified (see 6.2), a sample shall be subjected to first article inspection (see 6.3) in accordance with 4.4. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24792A Item Part A (resin) Part B (hardener) 3.2 Materials. The cured adh
19、esive material shall not produce toxic, corrosive, or explosive by-products. For safety of the material, all materials are subject to a toxicological and formulations review and inspection by the Government. 3.2.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
20、environmentally preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements and promotes economically advantageous life cycle costs. 3.3 Composition. The adhesive shall be a two-component, 100 percent so
21、lid, epoxy adhesive. 3.4 Performance requirements. The performance requirements shall be defined in terms of the mechanical, environmental, and chemical properties. 3.4.1 Viscosity (see 4.6.1). Each adhesive component shall have a viscosity as specified in table I. Viscosity (cps)l/ at +25 OC 1,000
22、to 10,000 300 to 5,000 3.4.4 Pot life (see 4.6.3). The mixed adhesive shall have a working life not less than 30 minutes at +25 OC I 5 OC. Throughout the working life, the adhesive shall be dispensable through a syringe needle with a 0.91-mm (.O4 inch) outer diameter. 3.4.5 Cure schedule (see 4.6.4)
23、. The mixed adhesive shall meet the requirements of 3.4.6, 3.4.7, 3.4.8, 3.4.9, 3.4.11, 3.4.12, 3.4.13, and 3.4.17 (space application only), when cured as specified (see 6.5 and table VIII). 3.4.6 Linear shrinkase (see 4.6.5). When cured in accordance with 3.4.5, the adhesive shall have a linear shr
24、inkage of not greater than 1 percent. 3.4.7 Hardness (see 4.6.6). When cured in accordance with 3.4.5, the adhesive shall have a Shore D hardness not less than 65. 3.4.8 Bond strensth (see 4.6.7). When cured in accordance with 3.4.5, the adhesive shall have a bond strength not less than 10.3 megapas
25、cals (MPa) (1,500 psi) at a temperature of +25 OC I 5 OC. 3.4.9 Glass transition temperature (see 4.6.8). When cured in 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24792A accordance with 3.4.5, the adhesive shall have a glass transition
26、 temperature not less than +85 OC. 3.4.10 Index of refraction (see 4.6.9). The adhesive shall have an index of refraction not less than 1.500. 3.4.11 Coefficient of linear thermal expansion (see 4.6.10). When cured in accordance with 3.4.5, the adhesive shal16have a coefficient of linear thermal exp
27、ansion not greater than 110 x 10- mm/OC. 3.4.12 Temperature (see 4.6.10). When cured in accordance with 3.4.5, and after exposure to non-operating temperature extremes between -40 OC and +85 OC, the adhesive shall meet the requirements of 3.4.11 when exposed to operating temperature extremes between
28、 -28 OC and +85 OC. 3.4.13 Water absorption (see 4.6.11). When cured in accordance with 3.4.5, the adhesive shall absorb an amount of water not greater than 0.5 percent of the adhesive weight. 3.4.14 Identification and markins (see 4.6.12). All containers shall be marked. The markings shall be perma
29、nent, clearly visible, and legible. Marking information shall include the PIN, CAGE code, manufacturers name, lot number, and date of manufacture. 3.4.15 Workmanship (see 4.6.13). All adhesive material shall be uniform in quality and free from foreign material or any defects detrimental to the fabri
30、cation or performance of the adhesive. 3.4.16 Connector compatibility (see 4.6.14). The adhesive shall securely hold an optical fiber within a fiber optic connector. The adhesive shall restrict axial movement of the optical fiber to less than 10.2 Fim with respect to the fiber optic connector ferrul
31、e. 3.4.17 Outsassins (see 4.6.15) (space applications only). The cured adhesive shall have a total mass loss (TML) of 5 1 percent and a collected volatile condensable material (CVCM) of 5 0.1 percent. 3.5 Shipping. Adhesive material shall not be shipped on any order to this specification if the ship
32、ping date is greater than 90 days from the manufacturing date. 4. QUALITY ASSURANCE PROVISIONS 4.1 General. Material delivered to this specification shall meet all requirements herein. The manufacturer shall perform the necessary tests and inspections in order to insure compliance with this specific
33、ation. 4.1.1 Test equipment and inspection facilities. Requirements for test equipment and inspection facilities shall be as identified in the contract (see 6.3.1). 4.2 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First contract inspection
34、 (see 4.3). b. First article inspection (see 4.4). c. Quality conformance inspection (see 4.5). 4.3 First contract inspection. First contract inspection (see 6.4.2) is applicable only on the first acquisition of a particular product under this specification. First contract inspections shall consist
35、of the tests listed in table II and shall be conducted in conjunction with first article inspections. The material submitted for testing shall be representative of the production process. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-2479
36、2A Inspection Identification and marking TABLE II. First contract inspection Requirement Test Sample size 3.4.14 4.6.12 All units I Index of refraction I 3.4.10 I 4.6.9 I I/ I Water absorption I 3.4.13 I 4.6.11 I 2/ Connector compatibility 3.4.16 4.6.14 3 connector assemblies - 1/ Three specimens sh
37、all be used from units selected at random from the first - 2/ Three specimens shall be used from units selected at random from the first contract sample. The specimens shall be uncured. contract sample. The specimens shall have been cured in accordance with 3.4.5. 4.3.1 Sample. The sample submitted
38、shall be a number of units of the same PIN, sufficient to complete all of the inspections. 4.3.2 Inspection routine. The sample shall be subjected to the inspections specified in table II, in the order shown. The tests identified in table II may be performed at the same time as the tests identified
39、in table III. 4.3.3 Failures. One or more failures shall constitute first contract inspection failure. 4.4 First article inspection. First article inspection shall consist of all the tests listed in table III. The material submitted for testing shall be representative of the production process. 4.4.
40、1 Sample. The sample submitted shall be a number of units of the same PIN, sufficient to complete all of the inspections. 4.4.2 Inspection routine. The sample shall be subjected to the inspections specified in table III, in the order shown. 4.4.3 Failures. One or more failures shall constitute first
41、 article inspection failure. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24792A Three specimens shall be used from units selected at random from the first article sample. Twelve specimens shall be used from units selected at random from
42、 the first article sample. The same specimens shall be used as are used in the shelf life inspection. Fifteen specimens shall be used from units selected at random from the first article sample. Three specimens shall be used selected from the specimens used in the cure schedule inspection. The same
43、specimens shall be used as are used in the coefficient of linear thermal expansion inspection. 4.5 Ouality conformance inspection. Quality conformance inspection shall consist of the inspections and tests specified for group A inspection (table IV), group B inspection (table V) and group C inspectio
44、n (table VI), as specified (see 6.2). Requirements for alternate forms of conformance inspection shall be as identified in the contract (see 6.3.2). 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-24792A Inspection 4.5.1 Group A inspection.
45、 Group A inspection shall consist of the tests listed in table IV, conducted in the order shown. TABLE IV. Group A inspection. Requirement Test Identification and marking 3.4.14 4.6.12 4.5.1.1 Samplins plan. Group A inspections shall be performed on 100 percent of the product supplied under this spe
46、cification. 4.5.1.2 Failures. One or more failures shall constitute group A inspection failure of the sample unit. 4.5.1.3 Disposition of sample units. Samples that have failed group A inspection shall not be shipped or submitted for group B testing. Inspection Workmanship Cure schedule Hardness Bon
47、d strength Requirement Test 3.4.15 4.6.13 3.4.5 4.6.4 3.4.7 4.6.6 3.4.8 4.6.7 4.5.2.4 Disposition of sample units. Samples that have failed group B inspection shall not be shipped or submitted for group C testing. 4.5.3 Periodic inspection. Periodic inspection shall consist of group C inspection. Ex
48、cept where the results of these inspections show noncompliance with the applicable test requirements (see 4.5.3.1.4), delivery of products which have passed group B shall not be delayed pending the results of these first article verification inspections. 4.5.3.1 Group C inspection. Group C inspectio
49、n shall consist of the inspections specified in table VI, in the order shown. Group C inspections shall be made on units that have passed the group B inspection. 4.5.3.1.1 Samplins plan. Every 60 months, a number of units of the same PIN, sufficient to complete all of the inspections, which have passed group B inspection, shall be selected. 4.5.3.1.2 Failures. One or more specimen or sample unit failures shall constitute group C inspection failure. 7 Provided by IHSNot
