1、= 9999906 2LL3420 285 1 J I INCH-POUND 1 MIL-P-8045B AMENDMENT 4 15 December 1999 SUPERSEDING AMENDMENT 3 22 February 1974 MILITARY SPECIFICATION PLASTIC, SELF-SEALING AND NON-SELF-SEALING TANK BACKING MATERIAL This amendment forms a part of MIL-P-8045BY dated 10 April 1964, and is approved for use
2、by all Departments and Agencies of the Department of Defense. PAGE 1 2.1 : Under Federal Specifications delete “QQ-A-355” and “QQ-A-362” and add the following: QQ-A-250/4 QQ-A-250/5 TT- S-73 5 Aluminum Alloy 2024, Plate and Sheet Aluminum Alloy, Alclad 2024, Plate and Sheet Standard Test Fluids, Hyd
3、rocarbon Under Military Specifications delete “MIL-S-3 136” and “MIL-P-7936.” Under Military Standards add “ML-STD-794 - Parts and Equipment, Procedures for Packaging and Packing of.” PAGE 2 3.5: Delete and substitute: “3.5 Flammabilitv. The backing material for Class 1 , Types II and III, shall be
4、self extinguishing when tested in accordance with Method 2022 of Federal Test Method Standard 406. The burning rate of Class 1, Type I, and Class 2, Types I, II and III shall not be greater than two (2) inches per minute.” 3.7: Delete “MIL-S-3 136” and substitute “TT-S-735.” AMSC NIA 1 of3 FSC 8030
5、DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- 9999906 2113421 111 - MIL-P-8045B AMENDMENT 4 3.9: Delete last sentence. 3.10: Delete and substitute: “3.1 O Tensile st
6、renrrth. The minimum average ultimate tensile strength as received for Class 1 , Types II and III material in both directions, shall be 22,000 psi. The minimum average ultimate tensile strength for Class 1, Types II and III, after 8 days +5 hours exposure to 160 24OF shall be 18,000 psi in both dire
7、ctions. The average ultimate tensile strength for Class 1, Types II and III material after 7 days 25 hours immersion in water shall be at least two-thirds of the average as-received value. The minimum average ultimate tensile strength as received for Class 1, Type I, and Class 2, Types I, II, and II
8、I in the lengthwise direction shall be 22,000 psi and in the crosswise direction shall be 18,000 psi. The minimum average ultimate tensile strength for Class 1, Type I, plastic backing material after 8 days 25 hours exposure to 160 24 OF shall be 15,000 psi; and for Class 2, Types I, II, and III pla
9、stic backing material after 8 days +5 hours exposure to 275 24 OF shall be 11,000 psi for either direction. The average ultimate tensile strength and secant modulus at 20 percent strain after 7 days 25 hours immersion in water shall be at least two-thirds of the average as-received value for both le
10、ngthwise and crosswise directions.” PAGE 4 Table I, column 3, item 7: Delete “18, and substitute “12.” PAGE 5 4.6.4: Delete “QQ-A-362” and “QQ-A-355” and substitute “QQ-A-250/5” and “QQ-A-250f4 respectively. * 4.6.4: Delete “95 percent methanol” and substitute “isopropyl alcohol.” PAGE 6 4.6.5: Dele
11、te and substitute: “4.6.5 Tensile imDact tests. Tensile impact specimens shall be at least 9 inches by 1 inch in overall size and shall have a configuration similar to the flat tension specimen of Type I as specified in Method 1 O 1 1 of Standard FED-STD-406. To insure failure of the specimen in the
12、 gage section, this section may be 0.40 inch wide instead of the specified 0.50 inch. Each grip end of the specimen shall have two bolt holes, each no larger than % inch in diameter, spaced at least 1 inch apart and !4 inch from the end along the longitudinal axis of the specimen. Tests shall be con
13、ducted on a pendulum-type impact machine. The specimen shall be held in rough surfaced grips with two bolts through each end (see figure 1). The specimen shall be mounted so that one grip is stationary and the other is free to move in a direction along the longitudinal axis of the specimen. The free
14、 grip-end shall strike the anvil of the testing machine with sufficient 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-i MIL-P-8045B AMENDMENT 4 force to break the specimen. Tests shall be conducted at standard conditions. At least twelve specimen
15、s shall be tested at standard conditions, half of them being tested in the lengthwise direction and half in the crosswise direction. Test results shall be reported as the average in each direction in foot-pounds per inch of specimen width at the gage sections. Location of failure for all specimens s
16、hall be reported. If failure of a specimen does not occur in the gage section, an additional test shall be conducted. Any other tensile impact test grip can be used only.after approval is granted by the procuring activity.” PAGE 7 5.2: Delete “Specification MIL-P-7936” and substitute “MIL-STD-794.”
17、NOTE: The margins of this amendment are marked with asterisks to indicate where changes from the previous amendment were made. This was done as a convenience only and the Government assumes no liability whatsoever for any inaccuracies in these notations. Bidders and contractors are cautioned to eval
18、uate the requirements of this document based on the entire content irrespective of the marginal notations and relationship to the last previous amendment. custodians: Navy - AS Air Force - 11 Army - MR Preparing activity: Navy - AS (Project 8030-8000) Review activities: Navy - MC, OS Air Force - 99 Army - AV 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
