1、MIL-N-4bbZB 93 = 99999Ob O508253 T M INCH-POUND MIL-M-46862B (MI) 24 February 1992 SUPERSEDING MIL-M-46862A (MI) 14 September 1984 MILITARY SPECIFICATION MOLDING MATERIAL, GLASS, EPOXY IMPREGNATED This specification is approved for use by the U.S. Army Missile Command, Department of the Army, and is
2、 available for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers one type of epoxy impregnated glass molding material. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications, standards, and handbooks. The following specifi
3、cations, standards, and handbooks form a Dart of I this document to the extent specified herein. 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
4、.2). Unless otherwise 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 Standardization
5、Document Improvement Proposal 1426) appearing at the end of this document or by letter. (DD Form AMSC N/A FSC 9330 DISTRIBUTION STATEMENT A. distribution is unlimited. Approved for public release; Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M
6、-4bb2B 93 H 9979906 0508254 I = MIL-M-4 68 62B (MI ) SPECIFICATIONS MIL I TARY MIL-R- 9300 - Resin, Epoxy, Low Pressure MIL-R-60346 - Roving, Glass, Fibrous (for Laminating Prepreg Tape and Rotating, Filament Winding, and Pultrusion Applications) (Unless otherwise indicated, copies of the federal an
7、d 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 form a part of this document to the extent specified herein. Unless othe
8、rwise 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 the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY
9、 OF TESTING AND MATERIALS ASTM C 613 - Resin in Inorganic-Filled Plastics ASTM C 695 - Compressive Properties of Rigid ASTM D 695 - Resin in Inorganic-Filled Plastics ASTM D 792 - Specific Gravity for Displacement of Water ASTM D 3951 - Commercial Packaging, Standard Practice for Plastics (Applicati
10、on for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103.) (Non-Government standards and other publications are normally available from the organizations that prepare or distribute the documents. These documents also may be availab
11、le in or through libraries or other informational services.) 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-46862B 73 7777906 O508255 3 M MIL-M-46862B (MI) 2.3 Order of precedence. the text of this document and the references cited herein, o
12、f this document takes precedence. however, supersedes applicable laws and regulations unless a specific exemption has been obtained. In the event of a conflict between the text Nothing in this document, 3. REQUIREMENTS 3.1 First article sample. Unless otherwise specified (see 6.2), a first article s
13、ample shall meet all the requirements of this specification. 3.2 Material. - 3.2.1 Composition. The material shall be a pre-mix consisting of a glass reinforcement impregnated with an epoxy resin system (see 4.5.4.1). 3.2.1.1 Reinforcement. The reinforcement shall meet the requirements of MIL-R-6034
14、6, Type I, K-37 Glass, Class 1, except that it shall be chopped. Reinforcement shall consist of 50 + 5% by weight of 0.250 + 0.062 inch long fibers and 50 + 5% by weight of 0.125 + 0.062 inch long fibers (see 4.5.4). - - 3.2.1.2 Resin system. The resin system shall consist of epoxy resin conforming
15、to MIL-R-9300, Type I, Grade O, Form A, modified with a suitable elastomer (see 4.5.4.4). manufacturer shall be capable of meeting the requirements specified herein after storage at a maximum temperature of + 4.4 Celsius for not less than 90 days (see 4.5.4.2). 3.2.2 Storage life. The material as fu
16、rnished by the (C) 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-fl-468628 93 I 999990b 0508256 5 I Characteristics MIL-M-46862B (MI) Minimum Minimum Average Individual 3.3 Performance characteristics. 3.3.1 Physical and chemical properties.
17、The physical and chemical properties of the material shall be as specified in Table I. TABLE I. Physical and chemical properties. Characteristics Average Minimum Maximum Resin content, % by weight Volatile content, % by Specific gravity Gel time, minutes weight 42 52 0.5 - - 1.50 2.5 5.0 Individual
18、Minimum Maximum 40 55 0.8 - - 1.48 2.0 5.5 3.3.2 Mechanical properties. The mechanical properties of the material shall be as specified in Table II. Table II. Mechanical Droperties. Compression strength, ultimate psi x 103 I Compression modulus, psi x lo6 21 2.0 18 1.8 4 Provided by IHSNot for Resal
19、eNo reproduction or networking permitted without license from IHS-,-,- MIL-M-468b2B 93 m 9999906 0508257 7 m Minimum Average at 68.3OC at -53.9OC Characteristics MIL-M-46862B (MI) Minimum Individual at 68.3OC at -53.9 C O 3.4 Environmental conditions. Compressive strength ultimate psi x 10 3 Compres
20、siog modulus, psi x 10 3.4.1 Mechanical properties at high and low temperatures. The mechanical properties shall be as specified in Table III. 12 29 1.4 2.0 Requirements shall be met at the temperature specified after soaking for 30 minutes. 9 22 1.2 1.5 3.5 Workmanship. The workmanship shall be suc
21、h as to ensure a product which is uniform and in accordance with this specification. All material shall be free of dirt, foreign matter, or other contaminates (see 4.7). 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, t
22、he contractor is responsible for the performance of all inspection requirements (examinations and tests) as specified herein. Except as otherw,se specified in the contract or purchase order, the contractor may use his own or any other facilities suitable for the performance of the inspection require
23、ments specified herein, unless disapproved by the Government. The Government reserves the right to perform 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 c
24、ompliance. All items shall meet all requirements of sections 3 and 5. The inspection set forth in this specification 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 responsibilit
25、y of ensuring that all products or The absence of any 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-Pl-468b2B 93 999990b 0508258 9 Requirement paragraph MIL-M-46862B (MI) supplies submitted to the Government for acceptance comply with all req
26、uirements 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 de
27、fective material. Test paragraph 4.2 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First article inspection (see 3.1 and 6.2) b. Quality conformance inspection (see 4.3). 4.2.1 First article inspection. Unless otherwise specified in the con
28、tractual document (see 6.21, a sample consisting of not less than 10 lbs. of the material, manufactured under the same conditions as those specified for subsequent production, shall be subjected to first article inspection. Accomplishment of first article inspection shall be as specified herein. If
29、the first article sample does not meet the requirements of this specification, it shall be rejected. Subsequent units shall not be considered for acceptance until Government approval of the first article sample has been obtained. Testing of the first article sample, to determine compliance with the
30、characteristics listed in Table IV shall be in accordance with the corresponding test paragraphs. TABLE IV. First article inspection. Characteristics Storage life Mechanical properties at high and low temperatures 3.2.2 3.4.1 4.5.4.2 4.5.4.3 6 Provided by IHSNot for ResaleNo reproduction or networki
31、ng permitted without license from IHS-,-,-c MIL-M-4b8b28 93 m 999990b 0508259 O MIL-M-4 68 62B MI) 4.3 Quality conformance inspection. 4.3.1 Sampling for quality conformance inspection. Sampling for quality conformance inspection shall be conducted on a random sample selected from each production lo
32、t in accordance with Table V. TABLE V. Sampling plan for quality conformance inspection. Lot Size Sample Size 2 to 315 Al 1 316 to 35,000 315 35,001 to 150,000 490 150,001 and over 715 NOTE: The acceptance number in all cases is ZERO. The rejection number in all cases is ONE. 4.3.2 Lot formation. A
33、lot shall consist of all the material manufactured in one continuous operation by the same process by the same manufacturer in accordance with this specification and submitted at one time for acceptance inspection. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without licens
34、e from IHS-,-,-MIL-M-46862B 93 M 9999906 0508260 7 M MIL-M-46862B (MI) 4.3.3 Quality conformance inspection. Quality conformance inspection of the sample specified in 4.3.1, to determine compliance with characteristics specified in Table VI, shall be conducted in accordance with the corresponding te
35、st and inspection paragraphs. TABLE VI. Quality conformance inspection. Characteristics Composition Mechanical properties Resin content, % by weight Volatile content, % by weight Specific gravity Gel time, minutes Packaging, packing and marking Workmanship Requirement paragraph 3.2.1 3.3.2 3.3.1 3.3
36、.1 3.3.1 3.3.1 5.1 3.5 Test paragraph 4.5.4.1 4.5.4.3 4.5.4.4 4.5.4.5 4.5.4.6 4.5.4.7 4.6 4.7 4.4 Inspection equipment. The inspection equipment used in conducting evaluation and tests shall be as specified in the applicable test methods and procedures paragraphs (see table VI). 4.5 Test methods and
37、 procedures. 4.5.1 Test conditions. Unless otherwise specified herein, the following conditions shall be used as a basis to establish performance requirements. a. Temperature Room ambient (16 to 32OC) b. Altitude Facility ground c. Humidity Facility ambient up to 95% relative humidity 8 Provided by
38、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-4bb2B 93 W 99999Ob 05082bL 9 W 4. MIL-M-46862B (MI) .2 Test sequence. Test sequence within each classification of inspection shall be at the option of the supplier. 4.5.3 Test specimen preparation. The type a
39、nd of test specimens shall be as specified bv the indivi - paragraph. 5 - O minutes at 50 + 15 lbf/in pressure to achieve gravity greater than-the minimum per Table I. Test specimens shali be molded at 149 to 4.5.4 Tests. configurat .dual test 165OC for a specific ion 25 + 4.5.4.1 Composition. The c
40、omposition shall-be certified by the supplier and the condition in the container shall be determined visually to establish conformance to 3.2.1. 4.5.4.2 Storage life. A sufficient amount of material shall be stored under the conditions specified in 3.2.2. the storage period, the material shall meet
41、all the requirements specified herein. The suppliers certification of compliance to the storage life requirements (see 3.2.2) may be accepted during the storage period. At the end of 4.5.4.3 Compressive properties. The ultimate strength and modulus of elasticity of the material in compression shall
42、be determined in accordance with ASTM D 695. specimens shall be tested at each temperature required. material shall meet the requirements of 3.3.2 or 3.4.1, applicable. A minimum of five The as 4.5.4.4 Resin content. Resin content of the material shall be determined in accordance with ASTM C 613. sp
43、ecimens shall be tested. The material shall meet the requirements of 3.3.1. A minimum of five 4.5.4.5 Volatile content. The volatile content shall be determined as follows: a. Specimen size shall be 10 + 2 grams selected from random areas in the sample, b. The specimens shall be weighed to the neare
44、st 0.01 gram. c. Place the specimens in crucibles in a circulating air oven preheated to 149 to 165OC. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-M-4bb2B 93 W 9999906 0508262 O MIL-M-4 68 62B (MI) d. Allow the specimens to remain in the o
45、ven for 15 + 1 - minute. e. Remove the specimens and place in a desiccator until cooled to room ambient temperature. f. Reweigh the specimens to the nearest 0.01 gram. g. Calculate the volatile content using the formula: wo - w1 CV(%) = x 100 WO where: Volatile content % - Original specimen weight -
46、 Devolatilized specimen weight - cv (%I WO W1 h. Report the individual and average of five specimens. The volatiles content shall be as specified in 3.3.1. 4.5.4,6 Specific gravity. Specific gravity of the material shall be determined in accordance with ASTM D 792. A minimum of five specimens shall
47、be tested and the material shall meet the requirements of 3.3.1. 4.5.4.7 Gel time. The gel time shall be determined as follows: a. Specimens approximately 5 grams in mass shall be b. The specimen shall be placed on a hot plate selected from random areas in the sample. preheated to 149 to 165OC. c. A
48、fter 3 to 5 seconds, remove the sample, leaving a small amount of resin on the surface of the hot plate. d. Start the stop watch. e. Probe the resin until it will no longer form strings when the probe is removed. 10 Provided by IHSNot for ResaleNo reproduction or networking permitted without license
49、 from IHS-,-,-c . MIL-M-46862B 93 W 9799906 0508263 2 W MIL-M-4 68 62B (MI) f. Stop the watch and record the gel time. g. Report the individual and average values of five tests. The material shall conform to 3.3.1. 4.6 Packaging, packing and marking. The inspector shall ascertain that packaging, packing and marking of the material shall conform to
