1、flIL-C-Y722YB W 999990b Lb3b4b3 846 W I INCH-POUND 1 MIL-C-47224B (MI ) 4 JANUARY 1993 SUPERSEDING MIL-C-47224A (MI) 20 February 1981 MILITARY SPECIFICATION COMPOUND, MOLDING, TRANSFER, EPOXY RESIN, SINGLE-COMPONENT This specification is approved for use by the U.S. Army Missile Command, Department
2、of the Army, and is available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers one type of single- component, epoxy resin transfer molding compound for encapsulating, potting, and embedding electrical devices requiring good thermal c
3、onductivity. 2. APPLICABLE DOCUMENTS a 2.1 Government documents. 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,
4、AL 35898-5270 by using the Standardization Document Improvement Proposal 1426) appearing at the end of this document or by letter. (DD Form AMSC N/A FSC 9330 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking p
5、ermitted without license from IHS-,-,-7 MIL-C-47224B W 9999906 3636464 782 W MIL-C-47224B (MI) 2.1.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of
6、 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 PPP-B-601 - PPP-B-621 - PPP-B-636 - PPP-B-640 - PPP-C-96 - PPP-D-705 - MILITARY MIL-P-116 - M
7、IL-1-16923 - STANDARDS MILITARY MIL-STD-129 - Boxes, Wood, Cleated-Plywood Boxes, Wood, Nailed and Lock-Corner Boxes, Shipping Fiberboard Boxes, Fiberboard, Corrugated, Triple-Wall Cans, Metal, 28 Gauge and Lighter Drum, Shipping and Storage: Steal, 16 and 30 Gal. Capacity Drums, Shipping and Storag
8、e, Steel, 55-Gallon (208 Liter) Preservation, Methods of Insulating Compound, Electrical, Embedding Marking for Shipment and Storage (Unless otherwise indicated, copies of the federal and military specifications, standards, and handbooks are available from the Standardization Documents Order Desk, B
9、ldg. 4D, 700 Robbins Ave., Philadelphia, PA 19111-5094.) 2.2 Non-Government publications. The following documents form a part of 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 cit
10、ed in the solicitation. Unless otherwise specified, the issues of 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-47224B (MI ) documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). AMERICAN SO
11、CIETY ASTM D 149 ASTM D 150 ASTM D 256 ASTM D 257 ASTM D 570 ASTM D 635 ASTM D 648 ASTM D 696 ASTM D 790 ASTM D 792 ASTM D 955 ASTM D 2240 FOR TESTING AND MATERIALS Standard Test Methods for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial P
12、ower Frequencies Standard Test Methods for A-C Loss Characteristics and Permitivity (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 Conductance of In
13、sulating Materials Standard Test Methods for Water Absorption of Plastics Standard Test Method for Rate of Burning and/or Extent of Time of Burning and Self-supporting Plastics in a Horizontal Position Standard Test Methods for Deflection Temperature of Plastics Under Flexural Load Standard Test Met
14、hods for Coefficient of Linear Thermal Expansion of Plastics Between -30 Degrees and 30 Degrees C Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials Standard Test Methods for Specific Gravity (Relative Density) and Density of Pla
15、stics by Displacement Standard Test Methods of Measuring Shrinkage from Mold Dimensions of Molded Plastics Standard Test Methods for Indentation Hardness of Rubber Property Hardness 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-VIL-C-47224B = 999
16、990b 3b3b4bb 555 MIL-C-47224B (MI) ASTM D 3123 - Spiral Flow of Low-Pressure ASTM D 3951 - Commercial Packaging, Practice for Thermosetting Molding Compounds (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Non
17、-Government standards arid other publications are normally available from the organizations that prepare or distribute the documents. These documents also may be available in or through libraries or other informational services.) 2.3 Order of precedence. In the event of a conflict between the text o
18、f 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 article. Unless otherwise specified (6.2), a first artic
19、le sample of the molding compound shall meet the requirements of this specification (see 4.3.1). 3.2 Material. The molding compound shall be a thermosetting mineral-filled epoxy resin formulated in granular form for application by the transfer molding process. The color of the molding compound after
20、 cure shall be black. 3.3 Electrical properties. The cured molding compound shall conform to the electrical requirements specified in Table I (see 4.4.2). 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-47224B (MI) TABLE I. Electrical propert
21、ies of cured molding compound. Property Flexural Strength, lbf/in2, minimum Izod impact, foot pounds per inch of notch, min i mum Property Value 13,000 0.30 Dielectric strength, volts per mil at +20 Celsius (C), minimum Hardness, Shore D, minimum Deflection temperature, degrees C, minimum Dielectric
22、 constant from 100 Hertz (Hz) to 10 gigahertz (ghz), maximum 90 +127 Volume resistivity, ohm-centimeter at +25OC, minimum Coefficient of linear thermal expansion, inch per inch per 0.56OC, maximum: From +24 to +93OC From +93 to -149OC Dissipation factor from 100 Hz to 100 megahertz per second (mHz),
23、 maximum 1.8 10-5 3.3 10-5 Dissipation factor from 100 Hz to 10 gHz, maximum Value 320 6.5 1 1013 0.06 0.05 3.4 Mechanical properties. The cured molding compound shall conform to the physical and mechanical properties specified in Table II (see 4.4.3). TABLE II. Physical and mechanical properties of
24、 cured molding compound. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-47224B = 7999906 1636468 328 Property Coefficient of thermal conductivity, British thermal units per hour per square foot per 0.56OC per inch, minimum Linear shrinkage o
25、f cold mold to cold part, inch per inch, maximum Cure temperature, OC, minimum to maximum MIL-C-47224B (MI) Value 4.2 0.008 +138, 20 minute maximum to +117, 20 minute maxi- mum (+280 to +350: TABLE II. Physical and mechanical properties of cured molding compound - Continued. Post-Cure, OC 149 + 10 S
26、pecific gravity at +23OC, maximum Spiral flow at +23OC and 1000 lbf/in2, inches, minimum Moisture absorption, percent, maximum Flammability Self extinguishing 2.3 30 3.5 Shelf life. The shelf life of the molding compound in unopened containers shall be not less than 6 months from date of manufacture
27、 when stored at temperatures from +10 to +2OoC (see 4.4.4). 3.6 Workmanship. The workmanship shall be such as to insure a high quality product which is uniform, free of contaminants, and in conformance with this specification(see 3.2 and 4.4.5. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for
28、inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements (examinations and tests) as specified herein. Except as otherwise 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without
29、license from IHS-,-,-MIL-C-47224B (MI) 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. The Government reserves the right to perform
30、any of the inspections set forth in this specification where such inspections are deemed necessary to ensure supplies and services conform to prescribed requirements. 4.1.1 Responsibility for compliance. All items shall meet all requirements of sections 3 and 5. The inspection set forth in this spec
31、ification shall become a part of the contractors overall inspection system or quality program. inspection requirements in the specification shall not relieve the contractor of the responsibility of ensuring that all products or . supplies submitted to the Government for acceptance comply with all re
32、quirements 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 indicated or actual, nor does it commit the Government to accept d
33、efective material. The absence of any 4.2 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First article inspection (see 4.3.1). b. Quality conformance inspection (see 4.3.2). 4.3 Inspection conditions. Unless otherwise specified, all inspecti
34、ons shall be performed in accordance with the test conditions specified in (applicable test method document or applicable paragraph(s) in the specification. shall consist of examinations and tests for the characteristics indicated in tables I, II and III. 4.3.1 First article inspection. First articl
35、e inspections 4.3.2 Quality conformance inspection. Quality conformance inspections for acceptance of the molding compound shall consist of the- following examinations and tests shown in table III. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI
36、L-C-47224B m 999990b 1636470 T8b m Requirement paragraph MIL-C-4 722 4B (MI ) TABLE III. Quality conformance inspection. Test paragraph Characteristics Hardness Specific gravity table II 4.4.3.3 table II 4.4.3.11 Spiral flow I table II I 4.4.3.1.2 I Workmanship 4.3.2.1 Lot size. Lot size shall consi
37、st of all the molding compound manufactured at one time, from one batch, forming part of one contract or order, and submitted for acceptance at the same time and place. 4.3.2.2 Samplinq. Unless otherwise specified (see 6.2), a sufficient quantity of molding compound from one unit representative of e
38、ach lot (see 4.3.2.1) shall be selected at random for quality conformance testing. Each container of material shall be considered as a unit of product. Failure of the sample to meet quality conformance requirements shall be cause for lot rejection. 4.4 Test methods and procedures. 4.4.1 Test specime
39、n preparation. The test specimen shall be prepared from molding compound in accordance with the manufacturers recommendations. 4.4.2 Electrical properties. 4.4.2.1 Dielectric strength. The dielectric strength shall be determined in accordance with ASTM D 149. The dielectric strength shall be as spec
40、ified in table I. 4.4.2.2 Dielectric constant. The dielectric constant shall be determined in accordance with ASTM D 150. The dielectric constant shall be as specified in table I. 4.4.2.3 Volume resistivity. The volume resistivity shall be determined in accordance with ASTM D 257. The volume resisti
41、vity shall be as specified in table I. 8 ! Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-47224B W 9999906 1636473 912 MIL-C-47224B (MI) 4.4.2.4 Dissipation factor. The dissipation factor shall be determined in accordance with ASTM D 150. shal
42、l be as specified in table I. The dissipation factor O 4.4.3 Mechanical properties. 4.4.3.1 Flexural strength. The flexural strength shall be The flexural strength determined in accordance withSTM D 790. shall be as specified in table II. 4.4.3.2 Izod impact. The Izod impact resistance shall be dete
43、rmined in accordance with ASTM D 256, Method A. The Izod impact resistance shall be as specified in table II. 4.4.3.3 Hardness. The hardness shall be determined in accordance with ASTM D 2240. table II. The hardness shall be as specified in 4.4.3.4 Deflection temperature. The deflection temperature
44、shall be determined in accordance with ASTM D 648. temperature shall be as specified in Table II. The deflection 4.4.3.5 Coefficient of linear thermal expansion. The coefficient of linear thermal expansion shall be determined in accordance with ASTM D 696. The-coefficient of linear thermal expansion
45、 shall be as specified in table II. 4.4.3.6 Coefficient of thermal conductivity. The coefficient of thermal conductivity shall be determined in accordance with MIL- 1-16923. II. The thermal conductivity shall be as specified in table 4.4.3.7 Linear shrinkage. The linear shrinkage of cold mold to col
46、d part shall be determined in accordance with ASTM D 955. The linear shrinkage shall be as specified in table II. measured at the geometric center of the test specimen during the entire curing cycle. table II. 4.4.3.8 Cure temperature. The cure temperature shall be The cure temperature shall be as s
47、pecified in 4.4.3.9 Moisture absorption. The percentage of moisture shall be determined in accordance with ASTM D 570, The percentage weight gain shall be as specified in table II. Procedure 6(a). 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL
48、-C-q7224B D 9999906 Lb3b472 859 D MIL-C-47224B (MI) 4.4.3.10 Flammability. The flammability shall be determined in accordance with ASTM D 635. The molding compound shall be self- extinguishing (see table II). 4.4.3.11 Specific gravity. The specific gravity shall be determined in accordance with ASTM
49、 D 792, Method A-1. The specific gravity shall be as specified in table II. 4.4.3.12 Spiral flow. The spiral flow shall be determined in accordance with ASTM D 3123. The spiral flow shall be as specified in table II. 4.4.4 Shelf life. The molding compound shall be tested for conformance with all requirements specified herein after completion of the storage period (see 3.5). The manufacturers certific
