1、ADHESIVE, EPOXY, SILVER FILLED, CONDUCTIVE This specification was approved by the Commissioner, Federal Supply Service, General Services Administration, for the use of all Federal agencies. 1. SCOPE AND CLASSIFICATION 1.2 Classification. The adhesives shall be of the following types, as specified Ty
2、pe I - Volume resistivity 0.010 ohm/cm. Type II - Volume resistivity 0.003 ohm/cm. 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issues in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent specified herein: Federal Specificat
3、ions: 3 QQ-A-250/5 - Aluminum Alloy Alclad 2024, Plate and Sheet. PPP-B-566 - Boxes., Folding, Paperboard. PPP-B-636 - Boxes, Shipping, Fiberboard. PPP-B-665 - Boxes, Paperboard, Metal Edged and Components. PPP-B-676 - Boxes, Setup. PPP-C-96 - Cans, Metal, 28 Gage and Lighter. I Fed. Std. No. 123 -
4、Marking for Shipment (Civil Agencies). Fed. Test Method Std. No. 141 - Paint, Varnish, Lacquer, and Related Materials; Fed. Test Method Std. No. 175 - Adhesives; Methods of Testing. Methods of Inspection, Sampling, and Testing. (Activities outside the Federal Government may obtain copies of Federal
5、Specifica- tions, Standards, and Handbooks as outlined under General Information in the Index of Federal Specifications- and Standards and at the prices indicated in the Index. The Index, which includes cumulative monthly supplements as issued, is for sale on a subscription basis by the Superintende
6、nt of Documents, U.S. Government Printing Office, Washington, DC 20402, (Singlecopies of this specification and other Federal Specifications required by activities outside the Federal Government for bidding purposes are available without charge from Business Service Centers at the General Services A
7、dministration Regional Offices in Boston, New YQrk, Washington, DC, Atlanta, Chicago, Kansas City, MO, Fort Worth, Denver, San Francisco, Los Angeles, and Seattle, WA. (Federal Government activities may obtain copies of Federal Specifications, Standards, and Handbooks and the Index of Federal Specif
8、ications and Standards from established distribution points in their agencies.) Military Standards: MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes. MIL-STD-129 - Marking for Shipment and Storage. (Copies of hilitary Specifications and Standards required by suppliers in con
9、nection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer.) FSC 8040 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- . _- H“-A-1931.80 W q79777i 000b900 S U MM“A-1931 2.2 Oth
10、er publicatas,. The following documents form a part of this specification to the extent specified herein. Unless a specific issue is identified, the issue in effect on date of invitation for bids or request for proposal shall apply. American Society for Testing anEaterials (ASTP) Standards: D 257 -
11、D-C Resistance or Conductance of Insulating Materials. D 1002 - Strength Properties of Adhesives in Shear by Tension Loading (Metal-to- D 2471 - Gel Time and Peak Exothermic Temperature of Reacting Thermosetting Resins. D 2651 Preparation of Metal Surfaces for Adhesive Bonding. . D 2730 - Sag Flow o
12、f Highly Viscous Resins. Metal) (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) National Motor Freight Traffic Association, Inc. , Agen!-: National Motor Freight Classification. (Application for copies should b
13、e addressed to the American Trucking Associations, Inc.,-Tariff Order Section, 1616 P Street, N.W., Washington, DC 20036.) Uniform Classification Committee, Agent: Uniform Freight Classification. (Application for copies should be addressed to the Uniform Classification Committee, Room 1106, 222 Sout
14、h Riverside Plaza, Chicago, IL 60606.) 3. REQUIREMENTS 3.1 Material. The adhesive shall consist of two components, a base polymer and a curing agent, so compounded and formulated that when mixed in accordance with instruc- tions (see 3.5)., they shall produce an adhesive meeting the requirements of
15、this specification. metallic silver particles, but it shall contain no copper or other metals, and it shall contain no fillers or extenders. as directed- shall produce an adhesive meeting the requirements of this specification. The curing agent shall contain no metals, extenders, or fillers. 3.1.1 B
16、ase polymer. The base polyner shall be of the epoxy type and contain the 3.1.2 Curin a ent. The curing agent shall be of a suitable type, which when mixed 3.1.3 Thinner. If required for attainment of specified working characteristics (see 3.2), a thinner compatible with the mixed adhesive components
17、 shall be furnished. 3.1.4 Form. The base polymer shall be in paste form. The curing agent shall be a paste or liquid, and the thinner, if required, shall be a liquid: but the forms in all cases shall be such as to assure conformance with 3.2. 3.1.5 Color. The mixed adhesive shall have a characteris
18、tic silver color. 31.6 Solids. The complete adhesive system shall be free of volatile solvents, and the average nonvolatile matter in the adhesive system shall be not less than 99.5 percent when tested as specified in 4.4.2. 3.1.7 Corrosion. The adhesive shall be noncorrosive to metal surfaces when
19、tested as specified in 4.4.3. 3.2 Working characteristics. 3.2.1 5plication. The adhesive, when mixed according to the manufacturers instructions (see 3.51, shall be smooth, free of lumps, and of consistency suitable for application. The individual components shall.not settle, nor shall the mixed co
20、mponents separate or settle out during normal pot life. The adhesive shall be capable of being applied at room temperatures between 16 to 38OC (60 and 100OF) and at a relative humidity not greater than 75 percent. 2 - i Provided by IHSNot for ResaleNo reproduction or networking permitted without lic
21、ense from IHS-,-,-MM“A-1931 3.2.2 Application life (pot life). The application life of the adhesive, when mixed and ready for use at 23 5 l0C (73 5 2F) shall be at least 60 minutes for a 1-ounce mass when tested as specified in table III. 3.2.3 Sag flow. The mixed adhesive shall not exhibit sag flow
22、 of more than 0.5 inch when tested as specified in table III and 4.4.4. 3.2.4 Curing time. The adhesive shall attain the minimum strength requirements specified herein (see table I) when cured 24 hours at 23 5 l0C (73 5 2F). Full cure shall not exceed 7 days. 3.3 Mechanical properties. Mechanical an
23、d electrical properties of test Specimens, prepared and tested as specified in section 4, shall conform to the respective requirements listed in table I. TABLE I. Mechanical and electrical properties Type I Type II Tensile shear, psi (minimum) at 23 t 1C (73 t 2F) at 60 T 1C (140-t 2F at -55-t 1C (-
24、67-L 2F) Volume rezistivity, ohm/cm (maximum) 1200 1200 1200 o. O10 1200 1200 1200 O. 003 3.4 Storage stability. After the separate components are stored as specified in 4.4.5t the prepared adhesive (see 3.5) shall conform to the following requirements: a. All requirements of 3.2.1 and 3.2.3. b. App
25、lication life shall vary not more than minus 10 percent from the values c. Curing time shall vary not more than plus 10 percent from the values specified d. Tensile shear shall vary not ?re than minus 5 percent from the values specified in 3.2.2. in 3.2.4. specified in table I. 3.5 Instruction sheet
26、. The manufacturer shall provide instructions for use with each kit of adhesive. The instructions shall-include the following information: a. Proportions by weight of components to be mixed, mixing instructions, including any controls necessary during mixing, and maximum pot life of the mixed adhesi
27、ve. b. Application instructions, including spread method, number of coats, weight range, application temperature, and acceptable glue-line (bond) thickness range. c. Typical time, temperature, and pressure for each segment of the complete curing cycle, giving minimum and maximum limits for each cond
28、ition. d. Instructions for use of thinner and clean-up. f. Storage, handling, and shelf life information. I e. Necessary safety precautions to be observed throughout all operations. The instructions may be included as a separate sheet or may be incorporated into the kit label. 4. QUALITY ASSURANCE P
29、ROVISIONS 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 in the contract or order, the supplier may use his own or any
30、other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved 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 that supplies
31、and services conform to prescribed requirements. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-“ MMH-A-3r931 80 W 499997Y 000b902 9 W W-A-1931 4.3.1 The supplier shall submit to the contracting officer a certificate of compliance indicating that
32、the adhesive complies with the shelf storage life require- ment as specified in 3.4. When certificates of compliance are submitted, the Government reserves the right to check test such items to determine the validity of the certificate I 4.2 Sampline. 4.2.1 S. For purposes of sampling, a lot shall c
33、onsist of all adhesive manu- factured as one batch and offered for delivery at one time. 4.2.2 Sampling for inspection of filled containers. A random sample of filled containers shall be selected in accordance with MIL-STD-105 at inspection level I and acceptable quality level (AQL) of 2.5 percent d
34、efective to verify compliance with this specification regarding fill, closure, and marking, and other requirements not involving tests. 4.2.3 sampling for lot acceptance. From each inspection lot, two containers of each component shall be selected at random. From each of the two Containers, one pint
35、 of the material shall be taken and placed in separate, clean, dry metal or glass containers, sealed, marked, and forwarded to the testing laboratory. Where packaging of the lot is in containers of less than 1-pint capacity, a sufficient number of the smaller size containers shall be selected so tha
36、t the specified two 1-pint samples of each component are available for forwarding to the testing laboratory. 4.2.4 Sampling for preparation for delivery. A quantity of shipping containers prepared for delivery, just prior to closure, shall be inspected in accordance with inspection level S-2 of MIL-
37、STD-105 and examined in accordance with 4.3.2. The lot size for this inspection shall be the number of Containers. 4.3 Inspection, 4.3.1 Inspection of containers. Samples selected in accordance with 4.2.2 shall be examined for defects of construction of the container, and the closure for evidence of
38、 leakage and for unsatisfactory markings; each filled container shall also be weighed to determine the amount of contents. Any container in the sample having one or mre defects or under required fill shall be rejected; and if the number of defective containers in any sample exceeds the acceptance nu
39、mber for the appropriate sampling plan of MIL-STD-105, the lot represented by the sample shall be rejected. 4.3.2 Inspection of preparation for deliverx!. Samples selected in accordance with 4.2.4 shall be inspected to determine that the preservation, packaging, packing, and marking comply with the
40、requirements of section 5 of this specification. Defects shall be scored in accordance with table II. Defects of closure listed shall be examined on -shipping containers fully prepared for delivery. The AQL shall be 4.0 defects per hundred units, TABLE II. Classification of preparation for delivery
41、defects Examine Defects Markings (exterior incorrect; illegible; improper size, location, sequence, or method of application. Materials Any components missing or damaged. Workmanship Inadequate application of components such as incomplete closure o container flaps, loose strapping, inadequate stapli
42、ng. Distortion of container, as applicable. contents (exterior container) Number per container is more or less than required. Net weight: exceeds requirements. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MMM-A-L73L 80 7777774 000b703 O W - “4-A
43、- 19 3 1 4.3.3 Lot acce tance_tests. The samples selected in accordance with 4.2.3 shall be subjected separ:tely to the tests specified in 4.4. If any one of the samples fails to pass any one of the tests specified, the lot represented thereby shall be rejected. 4.4 Test procedures-. The adhesive, m
44、ixed as recommended (see 3.5), shall be tested in accordance with table III. Unless otherwise specified, all tests shall be after curing 24 hours at 23 5 1C (73 2 2F). “_ “ TABLE III. Test Methods Paragraph giving Paragraph further Test giving requirement Met hod information “ _.- Solids 4041 1/ Cor
45、rosion 4031 F/ Application life D 247 3/ Sag flow (pot life) D 2730 z/ Preparation of metal D 2651 z/ Tensile shear D 1002 g/ Volume resistivity D 257 ?/ surfaces 4.4.2 4.4.3 4.4.4 4.4.1 4.4.1 -“ “_ 3.1.6 3.1.7 3.2.2 3.2.3 3.3 3.3 3.3 “ “ 1/ Federal Test Method Standard No. 141 (see 2.1) - 2/ Federa
46、l Test Method Standard No. 175 (see 2.1) - 3/ ASTM (see 2.2) 4.4.1 Tensile shear strenxt&. Adhesive shall be tested as specified in 4.4.1.1 for compliance with table I. 4.4.1.1 Specimen preparation. Tensile shear shall be determined using aluminum alloy (QQ-A-250/5, 2024, T3, 0.063-inch thickness) p
47、anels that have been cleaned and prepared for bonding in accordance with ASTM D 2651, Method A. Two 2.5 x 10 cm (1 x 4 inch) panels, overlapped 12.5 _+ .25 mm (0.500 5 0.01 inch) with an adhesive bond line having a thickness of .O25 to .125 mm (0.001 to 0.005 inch), shall constitute one test specime
48、n. Fifteen test specimens shall be prepared and cured as specified in 4.4. Testing shall be as specified in ASTM D 1002, at the temperature described below : Temperature 23 -4- 1C (73 -F 2F) 60 T 1C (140“t. 2F) -55 1C (-67 2F) Conditioning time, minutes - 30 30 specimens tested -I_._ 5 5 5 4.4.2 Sol
49、ids. Prepare approximately 7 grams f the ready-to-us adhesive by mixing proper proportions of base and curing agent which have been conditioned at 23 1C (73 + 2F) for 24 hours. The mixture shall be allowed to cool at 23 2 1C (73 E 2F) until exothermic reaction ceases. The specimen shall then be tested for nonvolatile matter by Method 4041 of Fed. Test Method Std. 310. 141. Three samples shall be tested, and the a
