1、 MIL-PRF-47257F (MI) 12 July 2010 SUPERSEDING MIL-PRF-47257E (MI) 1 April 2004 PERFORMANCE SPECIFICATION COMPOUND, EPOXY, FILAMENT WINDING This specification is approved for use by the US Army Research, Development, and Engineering Command and is available for use by all Departments and Agencies of
2、the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers a fiberglass roving impregnated with an epoxy resin-hardener compound used in the fabrication of filament wound structures. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are specified in sections 3,
3、4, or 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet al
4、l specified requirements of documents cited in sections 3, 4 or 5 of this specification, whether or not they are listed. AMSC N/A AREA CMPS DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. INCH-POUND Comments, suggestions, or questions on this document should be addr
5、essed to RDMR-SET Redstone Arsenal, AL 35898-5000 or emailed to malinda.allcorn1us.army.mil. Since contact information can change, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.daps.dla.mil. Provided by IHSNot for ResaleNo reproduct
6、ion or networking permitted without license from IHS-,-,-MIL-PRF-47257F (MI) 2 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 these documents are those cited in the solicitation or contra
7、ct. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) ASTM D1475 Density of Paint, Varnish, Lacquer, and Related Products, Test Methods for ASTM D2291 Fabrication of Ring Test Specimens for Glass-Resin Composites, Standard Practice for (Copies of these documents are available from www.astm.org or AS
8、TM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) 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
9、 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 inspection in accordance with 4.3. 3.2 Materials. Materials shall consist of a) an epoxy resin, b) an anhydride hardener, c) an am
10、ine promoter, and d) fiberglass roving. Ingredients a, b, and c shall provide not more than 26 4 percent of the product content by weight. (See 4.6.4.1 and 4.6.4.2). 3.2.1 Condition in container. The component materials in containers shall be free of gel particles and foreign matter that would adver
11、sely affect their intended purpose. Crystallization shall be eliminated by heating to not greater than 49 C and stirring shall be acceptable (see 4.6.4). The resin content shall be marked on the container. 3.2.2 Storage life. The individual components shall be capable of meeting the requirements of
12、this specification after storage in the original unopened containers at temperatures between 4 and 32 C in no sunlight for not less than 12 months from the date of shipment (see 4.6.4.3). 3.2.3 Properties of the mixed compound. The mixed epoxy compound consisting of resin, hardener, and promoter and
13、 mixed to the manufacturers specifications shall exhibit the following properties: 3.2.3.1 Viscosity. The viscosity, immediately after mixing, shall be within the range of 500 to 3000 milli pascal seconds (mPas) at 25 + 1 C (see 4.6.4.5). 3.2.3.2 Gel time. The mixed compound shall gel to a non-flowa
14、ble solid in not greater than 1 hour at 149 + 3 C (see 4.6.4.6). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-47257F (MI) 3 3.2.3.3 Product. The impregnated roving product shall be evenly wound on a tube with negligible free liquid compoun
15、d present. The material shall be readily removable from the container (aluminum alloy foil or polyethylene bag) with negligible adhesion to the container or to the roll and no deterioration of the roving during removal (see 4.6.4). 3.3 Performance characteristics. 3.3.1 Product. The product shall be
16、 capable of meeting the requirements of this specification after storage at a temperature not greater than 10 C for not less than 30 days, or after storage at room temperature (16 to 32 C) for not less than 5 days (see 4.6.4.3). 3.3.2 Shear strength. After a cure time of not greater than 3 hours at
17、141 + 3 C, the shear strength of the material shall be not less than 5000 pounds per square inch (psi) at an ambient temperature of 25 + 1 C (see 4.6.4.7). 3.4 Warning label. Containers of the epoxy compound shall be marked with a warning label addressing hazards and cautions as identified by the co
18、mponent manufacturers. 3.5 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements, and promotes e
19、conomically advantageous life cycle costs. 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a. First article inspection (see 4.3). b. Conformance inspection (see 4.4). 4.2 Inspection conditions. Unless otherwise specified, all
20、 inspections shall be performed in accordance with the test conditions specified in 4.3, 4.4, and 4.6.4.3 4.3 First article inspection. Unless otherwise specified in the contractual document (see 6.2), a sample of each type of material, manufactured under the same conditions as those proposed for su
21、bsequent production, shall be subjected to first article inspection. The sample shall consist of a 1-quart kit containing all the component materials, or a 1-quart sample of each material except the amine promoter, which may be furnished as a 1-pint sample. The sample shall also consist of not less
22、than 5 pounds of impregnated roving. First article inspection shall be as specified herein. Subsequent units shall not be considered for acceptance until Government approval of the first article sample has been obtained. Units subjected to first article inspection shall have successfully passed the
23、quality conformance inspection. Testing of the first article sample to determine compliance with the characteristics listed in TABLE I shall be conducted in accordance with the corresponding test paragraphs. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IH
24、S-,-,-MIL-PRF-47257F (MI) 4 TABLE I. First article inspection. 4.4 Conformance inspection. 4.4.1 Lot formation. 4.4.1.1 Component material. A lot shall consist of all the component material manufactured in one continuous operation by the same process by the same manufacturer in accordance with this
25、specification and submitted for inspection at one time. 4.4.1.2. Compounded material. A lot shall consist of all the compound material mixed in a continuous operation by the same process by the same compounder using the same specified lot of component materials in accordance with this specification
26、and submitted for inspection at one time. 4.4.2 Sampling for examination. Each container of component material shall be considered as a unit of product. Random selection of a container from each lot of component material shall be effected. From these sample component materials, sufficient quantities
27、 shall be randomly appropriated for the manufacture of sufficient fiberglass roving materials for subjection to the acceptance inspection as delineated in Table II. Failure of this sample to comply with the requirements specified in Table II shall be cause for lot rejection. Characteristics Test par
28、agraph Storage life 4.6.4.3 Component materials Specific gravity of epoxy resin Specific gravity of anhydride hardener Specific gravity of amine promoter Viscosity of epoxy resin Viscosity of anhydride hardener 4.6.4.4 4.6.4.4 4.6.4.4 4.6.4.4 4.6.4.5 4.6.4.5 Mixed compound Shear 4.6.4.7 Provided by
29、IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-47257F (MI) 5 TABLE II. Conformance Inspection. Characteristics Requirement paragraph Test paragraph Composition Condition in Container 3.2 3.2.1 4.6.4 4.6.4 Mixed compound Viscosity Gel Time 3.2.3.1 3.2.3.
30、2 4.6.4.5 4.5.4.6 4.5 Inspection equipment. Inspection equipment for conducting examination and tests shall be as specified in the following test methods and procedures paragraphs. 4.6 Test methods and procedures. 4.6.1 Test conditions. Unless otherwise specified herein, the following conditions sha
31、ll be used as a basis to establish performance requirements: a. Temperature, room ambient (16 to 32 C) b. Altitude, facility ground c. Humidity, facility ambient up to 95 percent relative humidity. 4.6.2 Test sequence. Test sequence within each classification of inspection (first article or quality
32、conformance) shall be at the option of the contractor. 4.6.3 Test specimen preparation. Unless otherwise specified herein, specimens shall be prepared as follows: 4.6.3.1 Packaged product material. To prevent moisture condensation on the impregnated roving, all packages of material which are removed
33、 from the storage cooler (see 3.3.1) shall be allowed to warm to room temperature for a minimum of 2 hours prior to opening the sealed bag. 4.6.3.2 Shear specimens. The filament wound rings shall be prepared from the product material in accordance with ASTM D 2291. If supplied as type I material, th
34、e components shall be mixed and type II material prepared. The filament wound rings shall be cured for not greater than 3 hours at 141 + 3 C. Shear specimens shall be fabricated from the rings to the dimensions shown on figure 1. Provided by IHSNot for ResaleNo reproduction or networking permitted w
35、ithout license from IHS-,-,-MIL-PRF-47257F (MI) 6 NOTE: Observe test precautions when handling the component or compounded materials during the following tests. FIGURE 1. Shear test specimen. 4.6.4 Composition. The condition in containers shall be examined visually and shall conform to requirements
36、of 3.2.1. The composition shall be certified by the contractor and shall conform to requirements of 3.2.2. 4.6.4.1 Resin content. The preferred procedure for determining the resin content of the product material shall be as follows: a. Weigh the empty impregnated roving spool (W1) prior to installin
37、g on the roving impregnating machine. b. Weigh the dry spool of roving (W2). c. After impregnating the roving, weigh the impregnated spool of (W3), roving and the dry roving spool remainder (W4) d. Calculate the resin content by the following formula: R = 100 - 100 x W2 - W4 W3 - W1 Where R = resin
38、percent content W1 = weight of empty impregnated roving spool W2 = weight of dry roving spool W3 = weight of impregnated roving spool Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-PRF-47257F (MI) 7 W4 = weight of dry roving spool remainder Ther
39、efore, W2 - W4 = weight of dry roving W3 - W1 = weight of impregnated roving e. Record the impregnated roving spool number, the net weight of the impregnated roving, the date, the resin formula number, the roving type, and percent resin content on a form affixed on the core of the impregnated roving
40、 spool. 4.6.4.2 Resin content, alternate method. The alternate procedure for determining the resin content of the product material shall be as follows: a. Weigh the specimen on an analytical balance (W5). b. Burn the specimen in a muffle furnace at 593 to 621 C for 1 to 2 hours or until the specimen
41、 is white. c. Cool the specimen in a desiccator. d. Weigh the specimen again on an analytical balance (W6). e. Calculate the resin content as follows: R = W5 - W6 x 100 W5 Where R = percent of resin content W5 = weight of specimen before burning W6 = weight of specimen after burning 4.6.4.3 Storage
42、life. The contractors certification of compliance to the storage life requirements (see 3.2.2) is required. 4.6.4.4 Specific gravity. The specific gravities of the epoxy resin, anhydride hardener, and amine promoter shall be determined in accordance with ASTM D 1475. 4.6.4.5 Viscosity. The viscosity
43、 shall be determined in accordance with the following: 4.6.4.5.1 Apparatus. a. Brookfield Syncho-lectric Viscometer, Model L.V.F., Brookfield Engineering Company, Inc., 240 Cushing Street, Stoughton, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MI
44、L-PRF-47257F (MI) 8 Massachusetts, or equivalent. b. Water bath capable of maintaining a temperature of 25 0.1C. c. A 600 ml beaker. 4.6.4.5.2. Procedure. a. Place the sample in the beaker and temperature condition it in the water bath to 25 0.1C. b. Attach a No. 1 spindle to the viscometer. c. Lowe
45、r the spindle into the sample so that the resin surface is at the machined groove in the spindle. Center the spindle in the beaker. Care must be exercised to prevent bubble entrapment on the spindle. Using the leveling device, level the viscometer. d. Depress the clutch at the back of the viscometer
46、; turn the instrument on; then, release the clutch. e. Allow the spindle to rotate at 30 revolutions per minute (rpm), for approximately one minute. Record the approximate scale reading. Depress the clutch, and stop the motor. Obtain three readings and take the average. f. Multiplying by the appropr
47、iate factor (as given in the tables and instructions furnished with the viscometer), convert the average scale reading for the spindle used into centipoises. 4.6.4.6 Gel time. To ensure the gel time conforms to 3.2.3.2, the following gel time test method shall be conducted. 4.6.4.6.1. Volumes. Test
48、sample volumes for thin-section applications, adhesives, tooling the surface coats, dip coatings, laminating materials, impregnants, caulking and sealing compounds, small-volume encapsulating and potting compounds shall be 15 mL (0.5 fluid oz). Working quantity shall be 60 mL (2 fluid oz). 4.6.4.6.2 Test apparatus. The following equipment shall be used to determine gel time. a. Sample container shall be an aluminum foil dish, approximately 7 cm (2.76 in.) in diameter and 1.4 cm (0.55 in.) deep. b. Wooden
