1、INCH-POUND MIL-R-47025A (MI) 5 March 1991 SUPERSEDING MIL-R-47025 (MI) 19 April 1974 MILITARY SPECIFICATION RESIN, CASTING, FIRE RETARDANT, EPOXY BASE This specification is approved for use by the U.S. Army Missile Command, Department of the Army, and is available for use by all Departments and Agen
2、cies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers one type of fire retardant casting resin consisting of an epoxy resin and an amine type curing agent. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. The following speci
3、fications, standards, and handbooks form a part of this document to the extent 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 so
4、licitation (see 6.2) . Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, U.S. Army Missile Command, ATTN: AMSMI-RD-SE-TD- ST, Redstone Arsenal, AL 35898-5270 by using the Standardizatio
5、n Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. FSC 9330 AMSC N/A DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MI
6、L-R-47025A 93 W 999990b OLi70000 9 W MIL-R-47025A (MI) SPECIFICATIONS MILITARY MIL-1-16923 - Insulating Compound, Electrical, Embedding STANDARDS FEDERAL FED-STD-141 - Paint, Varnish, Lacquer and Related Materials: Methods of Inspection, Sampling and Testing MIL IT ARY MIL-STD-129 - Marking for Ship
7、ment and Storage (Unless otherwise indicated, copies of the federal and military specifications, standards, and handbooks are available from the Standardization Documents Order Desk, Bldg. 4D, 700 Robbins Ave., Philadelphia, PA 19111-5094.) 2.2 Non-Government publications. The following documents fo
8、rm a part Unless otherwise specified, of this document to the extent specified herein. the issues of the documents which are DoD adopted are those listed in the issue of the DODISS cited in the solicitation. the issues of documents not listed in the DODISS are the issues of the documents cited in th
9、e solicitation (see 6.2). Unless otherwise specified, AMERICAN SOCIETY FOR TESTING ASTM D 149 - ASTM D 150 - ASTM D 256 - ASTM D 257 - ASTM D 570 - ASTM D 696 - AND MATERIALS Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Com
10、mercial Power Frequences Standard Test Methods for A-C Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulating Materials Standard Test Methods for Impact Resistance of Plastics and Electrical Insulating Materials Standard Test Methods for D-C Resistance or Conducta
11、nce of Insulating Materials Standard Test Method for Water Absorption of Plastics Standard Test Method for Coefficient of Linear Thermal.Expansion of Plastics 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- I - - . .I MIL-R-47025A 93 9999706 04700
12、OL O W MIL-R-47 O25A (MI) ASTM D 790 - Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Mat er ia 1 s ASTM D 792 - Standard Test Methods for Specific Gravity (Relative Density) and Density of Plastics by Displacement ASTM D 2240 - Standa
13、rd Test Method for Rubber Property- Durometer Hardness ASTM D 2863 - Standard Test Method For Measuring the Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index) (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Ra
14、ce Street, Philadelphia, PA 19103). THE SOCIETY OF THE PLASTICS INDUSTRY EPOXY RESIN FORMULATOR (ERF) ERF-2- 82 - Method of Test for Gel Time and Peak ERF-12-82 - Method of Test for Linear Shrinkage of Exothermic Temperature of Epoxy Compound Epoxy Casting Resin During Cure (Application for copies s
15、hould be addressed to the Society of the Plastics Industry, Inc., 1275 K St. N.W., Suite 400, Washington, DC 20005.) m- (Non-Government standards and other publications are normally available from the organizations that prepare or distribute the documents. documents also may be available in or throu
16、gh libraries or other informational services. 1 These 2.3 Order of precedence. 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 unles
17、s a specific exemption has been obtained. 3. REQUIREMENTS 3.1 First article sample. Unless otherwise specified (see 6.2), a first article (see 4.2) of the casting resin shall meet the requirements of this specification. 3.2 Materials. The casting resin shall consist of an epoxy resin and an amine-ty
18、pe curing agent capable of being fully cured at a temperature not greater than 71.1 Celsius (C). The casting resin shall be black in color. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-R-47 025A (MI 3.3 Electrical properties. The casting res
19、in shall meet the requirements specified in table I. TABLE I. Electrical properties. P rope rt y Value Dielectric strength, volts per mil at 20C 350 minimum volume resistivity (ohm-centimeter) at 2O0C i x 1012 minimum 1 Dielectric constant from 60 to 10“ cycles I 6.0 maximum I Dissipation factor fro
20、m 60 to 10“ cycles 0.09 maximum 3.4 Mechanical properties. The casting resin shall meet the requirements specified in table II. TABLE II. Mechanical properties. P rope rt y Flexural strength, pounds force per square inch (lbf / in2 ) Izod impact, foot pounds per inch (lbf-in) of notch Hardness (Shor
21、e D) Coefficient of linear thermal expansion, inch per inch per 0.56OC Coefficient of thermal conductivity British thermal units per hour per square foot per O .56OC Moisture absorption, percent (O) Linear shrinkage (inch/inch) Cure temperature including exothermic, OC MIL-R-47025A 93 a 999990b 0470
22、002 2 m Value 8000 minimum 0.2 minimum 73 minimum 35 x 10-6 maximum 2.7 minimum 1.0 maximum 0.01 maximum 110 maximum 3.5 Physical properties. 3.5.1 Viscosity. The viscosity of the uncatalyzed casting resin shall be 15000 - + 5000 centipoises (cP). 4 Provided by IHSNot for ResaleNo reproduction or ne
23、tworking permitted without license from IHS-,-,-L MIL-R-47025A 93 9999906 0470003 4 MIL-R-47025A (MI) 3.5.2 Specific gravity. The specific gravity of the casting resin at 23.9OC shall be 1.45 i 0.15. 3.5.3 Shelf life. The shelf life of the epoxy resin and curing agent in unopened containers shall be
24、 not less than one year from date of manufacture when stored at temperature of not more than 27OC. 3.5.4 Fire retardant. The casting resin, when compounded, shall be self-extinguishing or non-flammable. 3.6 Workmanship. The workmanship shall be such as to insure a product The resin shall which is un
25、iform and in conformance with this specification. be free of dirt, foreign material, or other contaminants. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspec
26、tion requirements (examinations and tests) as specified herein. Except as otherwise specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government.
27、any of the inspections set forth in this specification where such inspections are deemed necessary to ensure supplies and services conform to prescribed requirements. The Government reserves the right to perform 4.1.1 Responsibility for compliance. All items shall meet all requirements of sections 3
28、 and 5. The inspection set forth in this specification shall become a part of the contractors overall inspection system or quality program. The absence of any inspection requirements in the specification shall not relieve the contractor of the responsibility of ensuring that all products or supplies
29、 submitted to the Government for acceptance comply with all requirements of the contract. Sampling inspection, as part of manufacturing operations, is an acceptable practice to ascertain conformance to requirements, however, this does not authorize submission of known defective material, either indi
30、cated or actual, nor does it commit the Government to accept defective material. 4.2 First article sample. The first article sample shall be prepared using the same methods proposed for the preparation of subsequent production lots of casting resin. First article samples which do not meet all the re
31、quirements of this specification shall be rejected and returned to the contractor. 4.3 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First article inspection (see 4.4). 5 Provided by IHSNot for ResaleNo reproduction or networking permitted
32、without license from IHS-,-,- MIL-R-47025A 93 = 999990b 0470004 b = inspection Vis cos it y Specific gravity MIL-R-47025A (MI) Requirement Test paragraph paragraph 3.5.1 4.7.3.1 3.5.2 4.7.3.2 b. Quality conformance inspection (see 4.5 and table III). Shelf life Fire retardance 4.4 First article insp
33、ection. First article inspection shall be conducted only on the first article sample and shall consist of all the examinations and tests specified herein. 3.5.3 4.7.3.3 3.5.4 4.7.3.4 4.5 Quality conformation inspection. Quality conformance inspection for acceptance of resin and curing agent shall be
34、 in conformance with table III. TABLE III. Quality conformance inspection. 4.6 Lot size and sampling. 4.6.1 Lot size. Lot size shall consist of all the epoxy resin and curing agent manufactured at one time, from one batch, forming part of one contract or order, and submitted for acceptance at the sa
35、me time and place. 4.6.2 Sampling. Unless otherwise specified (see 6.21, 1 pint of epoxy resin and 0.125 pint of curing agent from one unit representative of each lot (see 4.6.1) shall be selected at random for quality conformance testing. Each container of epoxy resin and curing agent shall be cons
36、idered as a unit of product. Failure of sample to meet the quality conformance requirements shall be cause for lot rejection. 4.7 Test methods. 4.7.1 Electrical property tests. 4.7.1.1 Dielectric strength. The dielectric strength shall be determined in accordance with ASTM D149. The dielectric stren
37、gth shall be in conformance with section 3.3 (see table I). 4.7.1.2 Volume resistivity. The volume resistivity shall be determined in accordance with ASTM D257. The dielectric constant shall be in conformance with section 3.3 (see table I). 6 Provided by IHSNot for ResaleNo reproduction or networkin
38、g permitted without license from IHS-,-,-.,- v MIL-R-47025A 93 = 9999906 0470005 8 MIL-R-47 025A (MI) 4.7.1.3 Dielectric constant. The dielectric constant shall be determined in accordance with ASTM D149. The dielectric constant shall be in conformance with section 3.3 (see table I). 4.7.1.4 Dissipa
39、tion factor. The dissipation factor shall be determined in accordance with ASTM D150. The dissipation factor shall be in conformance with section 3.3 (see table I). 4.7.2 Mechanical property tests. 4.7.2.1 Flexural strenqth. The flexural strength shall be determined in accordance with ASTM D790. The
40、 flexural strength shall be in conformance with section 3.4 (see table II). 4.7.2.2 Izod impact. The impact resistance shall be determined in accordance with ASTM 256. The Izod impact resistance shall be in conformance with section 3.4 (see table II). 4.7.2.3 Hardness. The hardness shall be determin
41、ed in accordance with ASTM D2240. The hardness shall be in conformance with 3.4 (see table II). 4.7.2.4 Coefficient of linear thermal expansion. The coefficient of linear thermal expansion shall be determined in accordance with ASTM D696. The coefficient of linear thermal expansion shall be in confo
42、rmance with 3.4 (see table II). 4.7.2.5 Coefficient of thermal conductivity. The coefficient of thermal conductivity shall be determined in accordance with MIL-1-16923, The coefficient of thermal conductivity shall be in conformance with 3.4 (see table II). * 4.7.2.6 Moisture absorption. The moistur
43、e absorption shall be determined in accordance with ASTM D570. conformance with 3.4 (see table II). The moisture absorption shall be in 4.7.2.7 Linear shrinkage. The linear shrinkage during the curing process shall be in accordance with ERF 12-82. The linear shrinkage shall be in Conformance with 3.
44、4 (see table II). 4.7.2.8 Peak exothermic temperature. The temperature during the entire curing cycle shall be measured at the geometric center of the test sample, in accordance with ERF 2-82, Method C, except that the constant temperature bath shall be employed so as to simulate the actual cure tem
45、perature-time cycle for the casting resin. with 3.4 (see table II). The peak exothermic temperature shall be in conformance a 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - MIL-R-47025A 93 9999906 047000b T = MIL-R- 47 02 5A (MI ) 4.7.3 Physica
46、l property tests. 4.7.3.1 Viscosity. The initial viscosity shall be determined with a Brookfield Viscosimeter with a number 6 spindle, or equal, rotating at a speed of 20 2 5 revolutions per minute. The temperature of the casting resin during the test shall be at 23 2 3OC. 3.5.1. The viscosity shall
47、 be in conformance with 4.7.3.2 Specific gravity. The specific gravity shall be determined in accordance with ASTM D792. The specific gravity shall be in conformance with 3.5.2. 4.7.3.3 Shelf life. The resin and curing agent shall be tested for conformance with all requirements specified herein afte
48、r completion of the storage period (see 3.5.3). The manufacturers certificate of compliance with shelf life requirements may be accepted during the storage period. 4.7.3.4 Fire retardance. The casting resin shall be self-extinguishing or non-flammable when tested in accordance with ASTM D 2863. used
49、 during this test shall be prepared in accordance with Test Method 2021, Glass panels FED-STD-141. 5. PACKAGING 5.1 Preservation, packaging, and packing. Unless otherwise specified in the purchase order, the epoxy resin may be furnished in tin plate cans or pails with metal lids. The curing agent shall be furnished in glass bottles. The containers shall be non-reactive to the epoxy resin and curing agent. Size of the
