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1、-,-,- -,-,- -,-,- -,-,- -,-,- #W MIL-I-46058C SUPERSEDING MIL-I-46058B 22 December 1966 MILITARY SPECIFICATION INSULATING COMPOUND, ELECTRICAL (FOR COATING PRINTED CIRCUIT ASSEMBLIES) This specification is approved for use by all Depart- ments and Agencies of the Department of Defense. 1. SCOPE 1.1
2、Scope. This specification covers conformal coatings which are suitable for application to printed circuit assemblies by dipping, brushing, spraying, or vacuum deposition. 1.2 Classification. This specification covers the following types of conformal coatings (see 6.1 and 6.2): Type AR - Acrylic resi
3、n Type ER - Epoxy resin Type SR - Silicone resin Type UR - Polyurethane resin Type XY - Paraxylylene - 1/ 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in effect on the date of invitation for bids, or request for proposal, form a part of this specification to the extent specified
4、 herein. SPECIFICATIONS FEDERAL I QQ-S-571 - Solder, Tin Alloy, Tin-Lead Alloy; and Lead Alloy. TT-1-735 - Isopropyl Alcohol. PPP-C-96 - Cans, Metal, 28 Gage and Lighter. PPP-C-300 - Chemical, Liquid, Packaging and Packing of. PEP-D-729 - Drum, Metal, 55-Gallon (for Shipment of Noncorrosive Material
5、). PPP-P-704 - Pail, Shipping, Steel (1 through 12 Gallon). MILITARY MIL-P-13949 - Plastic Sheet, Laminated, Metal-Clad (for Printed Wiring). MIL-F-14256 - Flux, Soldering, Liquid (Rosin Base). MIL-R-39008/4 - Resistor, Fixed, Composition (Insulated), Established Reliability, MIL-C-45662 - Calibrati
6、on System Requirements. MIL-R-55182/7 - Resistors, Fixed, Film, Established Reliability, Style RNR50. MIL-C-81302 - Cleaning Compound, Solvent, Trichlorotrifluoroethane. Style RCR05. - 1/ This type coating is controlled by a proprietary process. Patents aid expiration dates are as follows: U. S. 3,2
7、21,068 - 30 November 1982 U.S. 3,342,754 - 19 September 1981 -U. S. 3,288,728 - 29 November 1983 The Government does not have a royalty free license. FSC 5970 MIL-I-46058C STANDARDS FEDERAL FED-STD-141 - Paint, Varnish, Lacquer and Related Materials; Methods of Inspection, FED-STD-406 - Plastics, Me
8、thods of Testing, Sampling, and Testing. MILITARY MIL-STD-129 - Marking for Shipment and Storage. MIL-STD-202 - Test Methods for Electronic and Electrical Component Parts. MIL-STD-275 - Printed Wiring for Electronic Equipment. (Copies of specifications, standards, drawings, and publications required
9、 by suppliers in con- nection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer. ) 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated,
10、the issue in effect on the date of invitation for bids or request for proposal, shall apply. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) D 150 - Methods of Test for AC Capacitance, Dielectric Constant and Loss Characteristics G 21 - Recommended Practice for Determining Resistance of Synthetic
11、Polymeric of Electrical Insulating Materials. Materials to Fungi. (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pa. 19103. ) 3. REQUIREMENTS 3.1 Qualification. The coating materials furnished under this specification sh
12、all be products which are qualified for listing on the applicable qualified products list at the time set for opening of bids (see 4.5 and 6.3). 3.2 Materials. The materials shall be free from deleterious substances and formulated with synthetic resins, elastomers, plasticizers, catalysts, and other
13、 ingredients which meet the require- ments of this specification. The materials shall be fluorescent for examination by ultra violet illumination and shall meet the requirements specified herein. Acceptance or approval of any con- stituent material shall not be construed as a guaranty of the accepta
14、nce of the finished product. 3.2.1 Composite coating system. A composite coating system under this specification shallbe evaluated as a single material. Primer and coating shall be prepared in accordance with the suppliers recommendations. Precoating surface treatments shall be considered part of th
15、e coating system. When tests are made on panels, the entire coating system shall be tested. 3.3 Compatibility. The coating materials shall be suitable for application and use on printed- circuit assemblies and shall be compatible with materials used therein (see 6.2); the coatings shall not cause de
16、terioration of materials used in the printed-circuit assemblies or components connected thereon (see 6.1.6). 3.4 Curing time and temperature. When coating materials are tested as specified in 4.8.1, the material shall be cured to full hardness in the time and temperature recommended by the supplier
17、(see 6.1 and 6.2). Unless otherwise specified (see 6.2), the curing time shall not exceed 4 hours for type AR, 8 hours for type ER, and 24 hours for types SR and UR. Unless otherwise specified (see 6.2), the.curing temperature shall not exceed 125 C. Type XY coating is formed in the cured state by t
18、he vacuum deposition method. 2 -,-,- MIL-I-46058C 3.5 Appearance. When coating materials are tested as specified in 4.8.2, the coating shall be smooth, homogeneous, transparent, unpigmented, and shall be free from bubbles, pinholes, whitish spots, blistering, wrinkling, cracking, and peeling. The co
19、ating shall not mask or obliterate the identification markings on electronic components. The coating shall not discolor the printed con- ductors and base materials greater than the discoloration caused by conditioning when uncoated. The coating shall not corrode any metals being coated. 3.6 Coating
20、thickness on test specimens. When measured as specified in 4.8.3, the coating thickness for types AR, ER, and UR shall be O. 002 *O. O01 inch. For type SR, the coating thick- ness shall O. 005 * O. 003 inch. For type XY, the coating thickness shall be O. 0006 f O. O001 inch. 3.7 Fungus resistance. W
21、hen coating materials are tested as specified in 4.8.4, the cured film shall resist the growth of fungi and shall have a rating of “O“. 3.8 Shelf life. When coating materials are tested in accordance with 4.8.5, the appearance, insulation resistance, and dielectric withstanding voltage shall meet th
22、e requirements of 3.5, 3.9, and 3.10, respectively. 3.9 Insulation resistance. When coating materials are tested as specified in 4.8.6, the average of the insulation resistance of all coated specimens shall be a minimum of 2,500,000 megohms (2.5 x 10l2 ohms), unless otherwise specified. The insulati
23、on resistance for each coated specimen shall be not less than 1,500,000 megohms (1.5 x 10l2 ohms), unless otherwise specified. 3.10 Dielectric withstanding voltage. When coating materials are tested as specified in 4.8.7, there shall be no disruptive discharge evidenced by flashover (surface dischar
24、ge), sparkover (air discharge), or breakdown (puncture discharge). The leakage rate shall not exceed 10 microamperes. 3.11 Q (resonance). When coating materials are tested as specified in 4.8.8, the average per- centage change in Q shall not exceed the values specified below. The minimum Q value for
25、 un- coated type GF laminates (MIL-P-13949) at frequencies of 1, 50, and 100 megahertz (MHz) shall be 50, 70, and 70, respectively (see 6.1.8). - Measurement Type AR 1 Type ER frequency Conditioning Maximum allow; Before and after 1 MHz 9 14 9 100 MHz 10 19 50 MHz coating 8 Before and after 100 MHz
26、20 in distilled water, 50 MHz immersion (condition 1 MHz -1 7- 1;- D-24/23) ble percentage Chang Type SR I Type UR I 8 12 12 10 12 16 5 8 10 10 10 10 9 7 11 11 7 7 3.12 Thermal shock. When coating materials are tested as specified in 4.8.9, the appearance and dielectric withstanding voltage shall me
27、et the requirements of 3.5 and 3.10,respectively. 3.13 Moisture resistance. When coating materials are tested as specified in 4.8.10, the appear- ance and dielectric withstanding voltage shall meet the requirements of 3.5 and 3.10, respectively; and the average of the insulation resistance of all co
28、ated specimens shall be a minimum of 10,000 megohms (1. O x 1O1O ohms) for types AR, SR, UR, and XY; and 1,000 megohms (1. O x lo9 ohms) for type ER. The insulation resistance for each coated specimen shall be not less t an 5,000 meg- ohms (5. O x lo9 ohms) for types AR, SR, UR, and XY; and 500 mego
29、hms (5. O x 10 ohms) for type B ER 3.14 Flexibility. When coating materials are tested as specified in 4.8.11, there shall be no evidence of cracking or crazing. -,-,- MIL-I“4605BC 59 W 7777706 0073855 T MIL-I-46058C . . . 3.15 Hydrolytic stability. When coating materials are tested as specified in
30、4.8.12, there shall be no evidence of softening, chalking, blistering, cracking, tackiness, loss of adhesion, or reversion to liquid state; and the clarity of the coating must remain suitable for the viewing of identification marking and color codes used to identify components over which the coating
31、 will be applied 3.16 Flame resistance. When coating materials are tested as specified in 4.8.13, the coating shall be self-extinguishing or non-burning. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is r
32、esponsible 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- approved by the Go
33、vernment. 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 prescribed requirements. 4.1.1 Test equipment and inspection facilities. Test and measuring equipment an
34、d inspection facilities of sufficient accuracy, quality and quantity to permit performance of the required inspec- tion shall be established and maintained by the supplier. The establishment and maintenance of a calibration system to control the accuracy of the measuring and test equipment shall be
35、in accor- dance with MIL-C-45662. 4.2 Classification of inspection. The inspections specified herein are classified as. follows: (a) Materials inspection (see 4.3). (b) Qualification inspection (see 4.5). (c) Qality conformance inspection (see 4.6). 4.3 Materials inspection. Materials inspection sha
36、ll consist of certification supported by veri- fying data that the materials used in formulating the coating are in accordance with 1.2, 3.2, and 3.2.1. The basic material and the main subgroup(s) shall be identified for each component and primer (eg., polyurethane-polyether). 4.4 Inspection conditi
37、ons. Unless otherwise specified herein, all inspections shall be performed in accordance with the test conditions specified in the “GENERAL REQUIREMENTS“ of MIL-STD-202. 4.5 Qualification inspection. Qualification inspection shall be performed at a laboratory accept- able to the Government (see 6.3)
38、 on sample lots produced with equipment and procedures normally used in production. 4.5.1 Sample size. Coating materials shall be furnished in sealed containers in sufficient quantity to prepare 28 test specimens (see 4.7) and to perform the tests specified in table I. The test specimens shall be as
39、 follows: Four glass panels, 16 copper-clad laminate panels, four tin- plated panels, and four copper-clad laminate strips. For type XY, because of the vacuum deposition method of application, the material to be tested shall be furnished by the supplier as coated board specimens. 4.5.2 Inspection ro
40、utine. The sample specimens shall be subjected to the inspections specified in table I. The specimens shall be divided as specified in table I for groups I to VII inclusive and subjected, in the order shown, to the inspections for their particular group. 4.5.3 Failures. One or more failures shall be
41、 cause for refusal to grant qualification approval. i 4 -,-,- MIL-I-46058C TABLE I. alification inspection. Examination or test Group I Curing time and temperature - - - Coating thickness - - - - - - - - - Fungus resistance - - - - - - - - - Group II Shelf life - - - - - - - - - - - - - - Insulation
42、 resistance- - - - - - - Dielectric withstanding voltage - Appearance - - - - - - - - - - - - Appearance- - - - - - - - - - - - Group I I I Q (resonance) - - - - - - - - - - - Thermal shock- - - - - - - - - - - Dielectric withstanding voltage - Appearance- - - - - - - - - - - - Group IV Appearance -
43、 - - - - - - - - - - - Insulation resistance - - - - - - - Moisture resistance - - - - - - - - Insulation resistance- - - - - - - Dielectric withstanding voltage - Appearance- - - - - - - - - - - - Group V Flexibility - - - - - - - - - - - - - Group VI Hydrolytic stability - - - - - - - - Group VII
44、Flame resistance - - - - - - - - - Requirement paragraph 3.4 3.5 3.6 3.7 3.8 3.5 3.9 3.10 . 3.11 3.12 3.5 3.10 3.5 3.9 3.13 3.5 (see 3.13) 3.10 3.14 3.15 3.16 Method paragraph 4.8.1 4.8.2 4.8.3 4.8.4 4.8.5 4.8.2 4.8.6 4.8.7 4.8.8 4.8.9 4.8.2 4.8.7 4.8.2 4.8.6 4.8.10 4.8.2 4.8. 6 4.8.7 4.8.11 4.8.12
45、4.8.13 .i “ 5 / , , , i. i Number and type of sample units to be inspected 4 (figure 1) 4 (figure 1) 4 (figure 1) 4 (tin plate) 4 (figure 1) 4 (strip) -,-,- MIL-I-46058C 4.5.4 _Retention of qualification. To retain qualification, the supplier shall forward a report at 24-month intervals to the quali
46、fying activity. The qualifying activity shall establish the initial reporting date. The report shall consist of: (a) A summary of the results of the tests performed for inspection of product for delivery, groups A alid B, indicating as a minimum the number of lots that have passed and the number tha
47、t have failed. The results of tests of all reworked lots shall be identified and accounted for. (b) A summary of the results of tests performed for qualification verification inspection, group C, including the number and mode of failures. The summary shall include results of all qualification verifi
48、cation inspection tests performed and completed during the 24-month period. I f the summary of the test results indicates nonconfor- mance with specification requirements, and corrective action acceptable to the qualifying activity has not been taken, action may be taken to remove the failing pro- duct from the qualified products list. Failure to submit the report within 30 days after the end of each 24-month period may result in loss of qualification for the product. In addition