1、-2 *r e MIL-M-46bLB 93 m 9999906 0467809 O m - I INCH - POUND I c. MIL-M-46861B (MI) 13 February 1991 SUPERSEDING MIL-M-4 6 8 6 1A (MI) 7 March 1980 MILITARY SPECIFICATION MOLDING MATERIAL, GLASS MAT, EPOXY COATED This specification isuapproved for use by the U.S. Army Missile Command, Department of
2、 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 two types of epoxy coated glass mat molding materials. 1.2 Classification. The material shall be of the following types, as specified (see 6.2) : Type I Typ
3、e II 2. APPLICABLE DOCUMENTS Mat, epoxy coated on the unidirectional roving side Mat, epoxy coated on the chopped fiber side 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
4、 to: Commander, U.S. Army Missile Command, ATTN: AMSMI-RD-SE-TD- ST, Redstone Arsenal, AL 35898-5270 by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 9330 DISTRIBUTION STATEMENT A. Approved for public release;
5、distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-h Fa ._ MIL-M-Ybb1B 93 9999906 0467810 7 = 2.1.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document
6、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 solicitation (see 6.2) . SPECIFICATIONS MILITARY MIL-R-9300 - Resin
7、, Epoxy, Low-Pressure Laminating MIL-M-43248 - Mats, Reinforcing, Glass Fiber MIL-R-60346 - Roving, Glass, Fibrous (for Prepreg Tape and Roving, Filament Winding, and Pultrusion Applications) STANDARDS MIL I TARY MIL-STD-1190 - Minimum Guidelines for Level C Preservation, Packing and Marking (Unless
8、 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 document(s) form a part of this docu
9、ment 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 the solicitation (see 6.2). Unless otherwise specifi
10、ed, Unless otherwise specified, AMERICAN SOCIETY,FOR TESTING AND MATERIALS (ASTM) ASTM C 613 - Resin Content of Carbon and Graphite Prepreg by Solvent Extraction, Standard Test Method for Test Method for Standard Test Method for Electrical Insulating Materials, Standard Test Method for ASTM D 638 -
11、Tensile Properties of Plastics, Standard ASTM D 695 - Compression Properties of Rigid Plastics, ASTM D 790 - Flexural Properties of Plastics and 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. MIL-M-4bBblB 93 m 999990b 0467833 9 m MIL-M-4 6 8 61B
12、 (MI ) ASTM D 792 - Specific Gravity (Relative Density) and Density of Plastics by Displacement, Standard Test Method for (Application for copies should be addressed to the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103-1137.) (Non-Government standards and other
13、 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 of this document and the referen
14、ces 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. When specified (see 6.2), a sample shall be subjected to first article inspect
15、ion (see 6.3) in accordance with 4.4. 3.2 Material. 3.2.1 Type I composition. The type I composition shall consist of the reinforcement coated with a hot melt epoxy resin system on the unidirectional roving side (see 4.8.1). 3.2.2 Type II composition. The type II composition shall consist of the rei
16、nforcement coated with a hot melt epoxy resin system on the chopped fiber side (see 4.8.1). 3.2.3 Reinforcement. 3.2.3.1 Construction. The reinforcement shall meet the requirements of MIL-M-43248, type V, grade A, and table I of this document (see 4.8.3). 3.2.3.2 Component distribution. The roving s
17、hall be evenly distributed across the width of the material at an average concentration of 5 2 1 roving per inch; a four inch width of material shall contain 20 5 2 rovings. The chopped strand fiber shall be equally distributed over the entire surface. Surfacing mat (table II) shall cover the entire
18、 area of roving side and may be overlapped to accommodate finish rovmat widths 50 inches or greater (see 4.8.12). 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-46861B (MI) TABLE I. Reinforcement construction. , 4 Component Unidirectional ro
19、ving - continuous Chopped strand Surfacing mat Glass sizing - all reinforcement Mechanical binding Width Selvage Length Definition 8-end, K-37 fiber, per MIL-R- 60346, type I, class 1 G- (135-140) fiber, per MIL-R- 60346; type I, class 1 - 1 to 4 inches, random length 0.010 with compatible finish Ch
20、rome silane or silane finish, 3% by weight maximum Mechanical needling, approxi- mately 180/square inch, over entire surface area through all reinforcing components As specified 5 0.25 inches (see 6.2) None - clean cut with no loose roving 50 5 10 linear yards. One splice per roll allowed. Flag each
21、 splice at roll end. 3.2.3.3 Rovinq distribution. The material shall be such that 80 percent of the construction is free o roving crossover. The gap between roving shall be not greater than 0.150 inch. A fine thread of single glass fiber, K-37, may be interlaced at 90 to the unidirectional roving at
22、 intervals of approximately 0.5 inch to control roving spacing (see 4.8.13). 3.2.3.4 Weight. The weight of the bare material shall be 2.50 0.25 ounces per square foot (see 4.8.14). 3.2.4 Resin system. The resin system shall consist of epoxy resin conforming to MIL-R-9300, type I, grade O, form A, mo
23、dified with a suitable elastomer (see 4.8.2). 3.2.5 Storaqe life. The materials as furnished by the manufacturer shall be capable of meeting the requirements specified herein after storage in the original unopened containers at a temperature not greater than 4O Celsius (C) for not less than 90 days
24、(see 4.8.4). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-5 MIL-M-4bbLB 93 M 999990b 04b7813 2 = MIL-M-46861B (MI) 3.3 Performance characteristics. 3.3.1 Physical properties. The properties of the materials shall be as specified in table II. TABLE
25、 II. Physical properties. Characteristics Tensile strength, ultimate psi x 103 Flexural strength, ultimate psi x 103 Flexural modulus, psi x lo6 Compression strength, ultimate psi x 103 Compression modulus, psi x lo6 Volatiles content, percent Resin content, percent Gel time, minutes Specific gravit
26、y Average Min. Max. 31 45 1.7 26 2.1 - 42 2.5 1.63 Individual Min. Max. 25 40 1.5 23 1.5 O0 40 2.0 1.60 Test paragraph 4.8.5 4.8.6 4.8.6 4.8.7 4.8.1 4.8.8 4.8.9 4.8.10 4.8.11 3.4 Environmental conditions. 3.4.1 Physical properties at high and low temperatures. The properties of the materials shall b
27、e as specified in table III. The requirements shall be met when tested at the specified temperature after a 0.5 hour soak (see 4.8.6). 3.5 Workmanship. The workmanship shall be such as to ensure a product which is uniform and in accordance with this specification. All the materials shall be free of
28、dirt, foreign matter, or other contaminants (see 4.9). 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-46863B 93 9999906 0467834 4 = x Average Minimum at 68.3OC at -53.9OC MIL-M-46861B (MI) Individual Minin at 68.3OC at I I 1 O TABLE III. Phy
29、sical properties at hiqh and low temperatures. 30 58 Characteristics Flexural strength ultimate, psi x 103 22 50 4.8.6 Flexural modulus, psi x 106 4.8.6 I 1.1 0.9 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the cont
30、ractor is responsible for the performance of all inspection 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 s
31、pecified herein, unless disapproved by the Government. any of the inspections set forth in this specification where such inspections are deemed necessary to ensure supplies and services conform to prescribed The Government reserves the right to perform requirements. 4.1.1 Responsibility for complian
32、ce. 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. specification shall not relieve the contractor of the responsibility of ensuring that all products or s
33、upplies submitted to the Government for acceptance comply with all requirements of the contract. 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 actua
34、l, nor does it commit the The absence of any inspection requirements in the Sampling inspection, Government to accept defective material. 4.2 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First article inspection (see 4.4). b. Quality confo
35、rmance inspection (see 4.5) . 4.3 Inspection conditions. Unless otherwise specified herein, t following conditions shall be used: a. Temperature Ambient room 16 to 32OC he 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-c MIL-M-4bblB 93 = 9999906 O
36、Yb78l5 b MIL-M-4 6 8 6 1B (MI) b. Altitude Facility ground c. Humidity Facility ambient up to 95 percent relative humidity 4.4 First article inspection. The contractor shall submit a first article sample for inspection as specified. consist of not less than 5 yards of full width type I or type II ma
37、terial manufactured under the same conditions as those proposed for subsequent production. The first article sample shall 4.5 Quality conformance inspection. Quality conformance inspections shall be as specified in table IV. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted with
38、out license from IHS-,-,-MIL-M-4686EB 93 E 9999906 0467816 A I L MIL-M-46861B (MI) TABLE IV. Quality conformance inspection. inspection Composition Type I Composition Type II Reinforcement construction Component distribution Roving distribution Weight Resin system Storage life Tensile strength Compr
39、ession strength and modulus Flexural strength, ult. x lo3 Flexural mod. x lo6 Resin content Volatiles content Gel time Specific gravity Physical properties at high and low temperatures Workmanship Requirement paragraph 3.2.1 3.2.2 3.2.3.1 3.2.3.2 3.2.3.3 3.2.3.4 3.2.4 3.2.5 3.3.1 3.3.1 3.3.1 3.3.1 3
40、.3.1 3.3.1 3.3.1 3.3.1 3.4.1 3.5 Test paragraph 4.8.1 4.8.1 4.8.3 4.8.12 4.8.13 4.8.14 4.8.2 4.8.4 4.8.5 4.8.7 4.8.6 4.8.6 4.8.9 4.8.8 4.8.10 4.8.11 4.8.6 4.9 4.5.1 Sampling. Unless otherwise indicated in the contract or order (see 6.2), sampling shall consist of a random sample selected from each p
41、roduction lot in accordance with table V. 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-4bbLB 93 m 9999906 04b7L7 T m Lot Size MIL-M-46861B (MI) Sample Size 2 - 15 16 - 25 26 - 90 91 - 150 151 - 280 281 - 500 501 - 1200 1201 - 3200 * 3201 -
42、 10,000 10,001 - 35,000 35,001 - 150,000 I 2 3 5 8 13 20 32 50 80 12 5 200 In all cases: Acceptance number is ZERO Rejection number is ONE 4.5.2 Lot formation. A lot shall consist of all the material manufactured in one continuous operation by the same process by the same manufacturer in accordance
43、with this specification and submitted for inspection at one time. 4.6 Inspection equipment. The inspection equipment for conducting examination and tests shall be as specified in the applicable test methods paragraphs (see 4.8) to verify conformance with requirements in section 3. 4.7 Test specimen
44、preparation. Unless otherwise specified herein, specimens shall be prepared as follows to verify conformance with requirements in section 3. a, A 12 x 12 inch flat panel shall be molded from the material as follows : 1. Four plies, 12 x 12 inches, shall be cut from the sample. 2. The panel shall be
45、layed up so that the unidirectional rovings in the first three plies are parallel and in the fourth ply (outside) at 90. b. The panel shall be cured by placing the layup in a 12 inch mold preheated from 65 to 74OC, and applying sufficient pressure to close the mold to stops which will control the pa
46、nel thickness to 0,117 2 0.005 inch. The panel shall be cured for 25 + 5 or - 0.0 minutes. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I_ MIL-M-4bBbLB 93 99999Ob 04b78b8 b n CS MIL-M-46861B (MI) c. The cured panel shall be removed from the mold
47、 and allowed to cool to ambient room temperature. d. Mechanical test specimens shall be cut from the panel so that the three parallel plies are parallel to the specimen length. 4.8 Test methods. 4.8.1 Composition, type I and II. The composition shall be determined visually to verify conformance to 3
48、.2.1 or 3.2.2, as applicable. 4.8.2 Resin system. The resin system shall be certified by the supplier to verify conformance to 3.2.4. 4.8.3 Reinforcement construction. The reinforcement construction shall be certified by the supplier to verify conformance to 3.2.3.1. 4.8.4 Storage life. A sufficient
49、 amount of materials in the original unopened containers shall be stored under the conditions specified in 3.2.5. At the end of the storage period, the material shall meet the requirements specified herein. The suppliers certification of compliance to the storage life requirements (see 3.2.5 and 6.2) may be accepted during the storage period. 4.8.5 Tensile ultimate. The ultimate tensile st
