1、MIL-A-81264 53 W 7777706 0110104 8 y -, /- MIL-A-81264 (W) 17 May 1965 MILITAFtY SPECIFICATION ASBESTOS FELT OR MAT, RESIN IMPREGNATED This specification has been approved by the Bureau of Naval Weapons, Department of the Navy. 1. SCOPE 1.1 Scope. This specification covers types and classes of asbes
2、tos felt or mat impregnated with a resin at the semi-cured state. 1.2 Classification. The resin impregnated asbestos felt or mat shall be classified by type in accordance with 3.4.1 and by class in accordance with 3.4.2. 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in effect on
3、date of invi- tation for bids or request for proposal, form a part of this specification to the extent specified herein. SPECIFIC ATIONS Military MIL-R-9299 MIL-P- 116 STANDARDS Federal Federal Test Method Standard 406 Military MIL-STD-129 Resin, Phenolic, Low Pressure Laminating Preservation, Metho
4、ds of Plastics, Methods of Tests For Marking for Shipment and Storage 0 FSC-5330 ,M7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-LZb4 53 W 37777Ob OlL0105 T W MIL -A- 81264 ( WP) (When requesting any of the above documents, give the title a
5、nd complete designation of the item shown above. Copies of this specification and other unclassified specifications, standards and publications required by contractors in connection with specific procurement functions may be obtained from the Commanding Officer, Navy Su ply Depot (CDS), 5801 Tabor A
6、venue, Phila- delphia, Pennsylvania, 19 120. a 2.2 Other publications. The following documents form a part of this specification to the extent specified herein. Unless otherwise indicated, the issue in effect on date of invitation for bids or request for proposal, shall apply. PUBLICATIONS American
7、Society for Testing and Materials ASTM D 638-61T ASTM D 792-6T ASTM D 1918-621: Method of Test for Tensile Properties of Plastics Method of Test for Specific Gravity and Density of Plastics Tests for Asbestos Content of Asbestos Textile Materials (Application for copies should be addressed to the Am
8、erican Society for Testing and Materials, 1916 Race Street, Philadelphia, Pennsylvania, 19103.) 3. REQUIREMENTS 3.1 Preproduction samples. Unless otherwise specified in the contract or order, preproduction samples of the resin impregnated felt or mat shall be manufactured using the methods and proce
9、dures proposed for the pro- duction. The sample shall be tested as specified in Section 4 herein and is for the purpose of determining that, prior to starting production, the con- tractors production methods are capable of yielding items that comply with the technical requirements of the contract. A
10、fter satisfactorily passing all the preproduction tests specified herein, no changes in raw materials or processing of materials for production shall be made without prior written approval of the procuring activity. 3.2 Data requirements. by applicable documents referenced in Section 2 unless specif
11、ied in the contract or order (see 6.2). No data is required by this specification or /- Y . Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. . MIL-A- 81264(WP) Type 1 spe II Type III Type IV 3.3 Material. The material shall be made by impregnating a
12、 Chrysotile asbestos fiber conforming to ASTM D 1918-62T, grade AAAA, with a resin conforming to MIL-R-9299, Type II, Class 2. Nominal Thickness, Inches 0.01 O. 04 O. 08 O. 15 3 4 Phvsical and chemical DroDerties Resin Content (percent) Minimum Maximum 44. O 60.0 37. O 49.0 37.0 49. O 32.0 42. O 28.
13、0 38. O 22.0 32.0 3.4.1 Types. The types of resin impregnated asbestos shall be as specified in Table 6. Table I - Types of Resin Impreganted Felt or Mat Flow (percent) Minimum Maximum 28.0 38.0 24.0 33.0 17.5 26.5 11.0 19.0 11.0 19.0 2.0 7.0 Ounces per Square Foot 0.43 to 0.88 2.2 to 2.8 4.5 to 5.5
14、 9;o to 11.0 NOTE: Separator not included in weights. 3.4.2 Classes. The classes of resin impregnated asbestos shall be as specified in Table II. All vahies are for individual specimens. Table II. Classes of Resin Impregnated Felt or Mat 3.4.3 Volatiles 9 19 8 18 7 15 7 15 6 14 3 11 Minimum Maximum
15、Physical properties of cured material. The physical properties of the cured material shall be as specified in Table III. All values are for individual specimens. 3 -_ a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-_ MIL-A-81264 53 777770b 0110107
16、3 Specific Gravity, Minimum 1.15 1.30 1.50 1.55 1.70 1.80 MIL-A- 8i264(WP) Tensile Strength, Compressive Strength, Minimum, Psi Minimum, Psi 13,000 6 , O00 26,000 13,000 28,000 14,000 32,000 14,000 35,000 14,500 21,000 12 , O00 Table III. Physical Properties of Cured Material Class 3.5 Workmanship.
17、The material shall be uniform in quality and shall be free from impurities and other defects that could adversely affect its use. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the supplier is responsible for the perfo
18、rmance of all inspection requirement9 as specified herein. Except as otherwise specified, the supplier may utilize his own facilities or any commercial laboratory acceptable to the Government. The Government reserves the right to perform any of the inspections set forth in the specification where su
19、ch inspections are deemed necessary to assure supplies and services conform to prescribed requirements. 4.2 Classification of inspections. Inspection of the asbestos felt or mat shall be classified as follows: a. Preproduction inspection (see 4.4) b. Quality conformance inspection (see 4.5) 4.3 Samp
20、ling 4.3.1 Preproduction sample. A preproduction sample of sufficient quantity of the impregnated asbestos from each container manufactured in accordance with 3.1 shall be subjected to 3 each of the preproduction tests detailed in 4.4 at an activity designated by the procuring activity. Further prod
21、uction of the impregnated asbestos by the supplier, prior to the approval a -. 3 I. 2 :* -7 4 - -_./- .- . -. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-12bY 53 = 779990b 0110108 5 = Class 1 2 3 4 5 6 MIL-A- 81264(WP) Pres sur e, Time, Tem
22、perature Psi Minutes Degrees F i5 f 2 301 1 300 f 5 50 f 5 30 f 1 300 f 5 75 f 5 30 f 1 300 f 5 100 f 5 30 f 1 300 f 5 200 f 10 30 f 1 300 f 5 500 f 25 30 f 1 300 f 5 of the preproduction sample, shall be at the suppliers risk. 4.3.2 Quality conformance inspection sampling. Unless otherwise specifie
23、d, sufficient material shall be taken from each lot to perform the tests as specified in 4.5. 4.4 Preproduction inspection. The preproduction sample, after satis - factorily passing the quality conformance inspections detailed in 4.5, shall be subjected to the following tests and examinations. 4.4.1
24、 Laminating cycle and physical properties. Each class of material shall be subjected to the laminating cycle as specified in Table IV prior to evaluating the physical properties. 4.4.1.2 Tensile strength test. The tensile strength of the cured material shall be determined in accordance with ASTM D 6
25、38-61T. 4.4.1.3 Compressive strength test. The compressive strength of the cured material shall be determined in accordance with Federal Test Method Standard 406, method 1021. ,-. t 5 .- Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-A-81264 53
26、 W 9799706 OLlOLO9 7 W MIL-A- 81264 (W) 4.5 Quality conformance inspection 4.5.1 Visual examination. Visually examine each container in the lot to determine compliance with 3.5 and Section 5. 4.5.2 Volatile content test. Weigh a sample of approximately 5 grams (gm) to the nearest 0.001 gm. Dry to co
27、nstant weight (approximately 15 minutes) at 325 f 5 degrees F in an air circulated oven. Cool in a desiccator for 15 to 20 minutes, then accurately weigh sample to the nearest 0.001 gram. Calculations are as follows: x 100 Weight loss Original weight Percent volatile = 4.5.3 Resin content test. Use
28、approximately two grams of sample which has volatile removed (see 4.5.2). Weigh sample to the nearest 0.001 gram. Place sample directly into furnace for 60 to 65 minutes at 1525 25 degrees F. Remove sample from furnace and cool in a desiccator for 15 minutes, then weigh (to the nearest 0.001 gram) t
29、o constant weight. Calculations are as follows: Ash weight X 100 Original weight X 0.86 = Percent inorganic Percent inorganic subtracted from 100 percent = percent resin content (0.86 in above formuIa is a correction factor for water of crystallization of Chrysotile asbestos.) Cut sample material to
30、 be tested in nominal 4-inch 4.5.4 Resin flow test. by $.-inch squares. Stack up neatly as many plies as required to obtain weight of approximately 25 grams, weighed to the nearest 0.01 graq. Place material between waxed chrome plates (stainless steel plates may be sub- stituted) and press at 300 f
31、5 degrees F at 400 * 25 psi until resin is completely cured. This would be approximately 5 minutes for class 6 materials and up to 30 minutes for class 1 materials. Remove all resin flash from pressed sample and weigh the sample to the nearest 0.01 gram. Calculation of flow is as follows: Provided b
32、y IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-BL2bLl 53 7779906 OLLOLL0 3 100 - essed weight x 100) = Percent flow (original weight) Preimpregnated felts or mats shall be conditioned before test at a room temperature of 70 f 5 degrees F, and a relative
33、 humidity of 50 f 10 percent for 12 hours prior to testing. If this is not possible, allowances must be made in readings. Temperature and humidity should be recorded at time of test if above conditions cannot be met. 4.6 Acceptance criteria 4.6.1 Preproduction. Failure of any sample to conform to an
34、y require- ment of this specification shall be causefor rejection of the sample. 4.6.2 Quality conformance. Failure of any sample to meet any require- ment of this _specification shall be cause for rejection of the lot. 5. PREPARATION FOR DELIVERY 5.1 Preservation, packaging and packing. Unless othe
35、rwise specified by the procuring activity, the preservation, packaging and packing shall be in accordance with MIL-P-116, method III. 5.2 Marking. Each container shall be marked in accordance with MiL-STD-129. Marking shall include, but not be limited to, the following infor mation: a. Manufacturers
36、 name and location b. Material trade name c. Net weight or volume d. Lot number, batch number and date of manufacture e. Shelf life or storage limitations f. Number and revision letter of this specification 6. NOTES 6.1 Intended use. The material purchased in accordance with this . specification is
37、intended to be used as insulating material in rocket motors. . -. . 7 - Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-A-81264 53 W 7779706 OLLOLL1 5 m _ _ - MIL-A- 8126L+.(WP) 6.2 Ordering data. Procurement documents should specify, but not be
38、limited to, the following information: a. Title, number and revision letter of this specification b. Minimum lot size, if applicable , c. Whether preprodudkion samplq 4; *oared e. Size of container f. Request for test data g. Whether broad goods sample is needed for testing a. CE - IPL ._ d. Place of delivery er L. I 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
