NAVY MIL-M-81999 A-1977 MOLDING COMPOUND REVERSION RESISTANT NON- CARCINOGEN CURING POLYURETHANE AIRCRAFT STRUCTURE《飞机非致癌物质固化聚氨酯抗逆转模塑化合物的结构》.pdf

《NAVY MIL-M-81999 A-1977 MOLDING COMPOUND REVERSION RESISTANT NON- CARCINOGEN CURING POLYURETHANE AIRCRAFT STRUCTURE《飞机非致癌物质固化聚氨酯抗逆转模塑化合物的结构》.pdf》由会员分享，可在线阅读，更多相关《NAVY MIL-M-81999 A-1977 MOLDING COMPOUND REVERSION RESISTANT NON- CARCINOGEN CURING POLYURETHANE AIRCRAFT STRUCTURE《飞机非致癌物质固化聚氨酯抗逆转模塑化合物的结构》.pdf（23页珍藏版）》请在麦多课文档分享上搜索。

1、- MIL-M-8377A 80 777770b 0330788 7 W . . -&81999A(,f&) f ?I : Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I - - MIL-M-8L777A 80 M 7777706 OLL0807 7 20 .:- P J rl I D Provided by IHSNot for ResaleNo reproduction or networking permitted without lic

2、ense from IHS-,-,-MIL-M- 8 1 9 9 9A (AS ) .500 .875 DEPTH OF SLOTS 7 . 1.031 VIEW SHOWING SLOTS FOR PANELS *- e 7 DIMENSIONS IN INCHES. FIGURE 2. Contour block. (see 4.6.12) P 21 Y Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-* TABLE I. Physical p

3、roperties of cured compounds. (see 3.5.2.1) Physical property Hardness, Type A Durometer &/ rensile Strength, PSI, minimum Ultimate elongation, percent, min. Shrinkage percent, maxhm A/ Specific gravity, range Tear strength, ppi, min. Compression set, percent max. Adhesion, lbs/inch of width, min. T

4、o steel To aluminum Moisture absorption, percent max. Low temperature flexibility at -53.9“C (-65OF)Z/ Fungus resistance Ozone resistance, 28 days exposure oil resistance: 31 Change in hardness, percent max. Change in weight, percent max. Change in hardness, percent max. Tensile strength after heat

5、aging, PSI, min. Hydrolytic stability: Change in hardness points, max. Tensile strength after exposure, PSI, min Elongation after hydrolytic stability, percent min. Heat aging Class 1 65 +5 1600 400 5. O 1.0-1.2 130 35 30 30 3. O Pass Non- nutrient Pass 40 40 15 1500 15 1400 300 quiremen Class 2 8-5

6、 3300 400 5. O 1.0-1.2 200 50 40 40 3. O Pass NOTI- nutrient Pass 40 30 15 3200 25 2300 300 S Class 3 90 +5 4000 400 5. O 1.0-1.2 340 65 50 50 3. O Pass Non- nutrient Pass 40 30 15 3500 25 3000 300 - Test paragraph 4.6.4 4.6.5 4.6.5 4.6.6 4.6.7 4.6.8 4.6.9 4.6.10. i 4.6.10.1 4.6.11 4.6.12 4.6.13 4.6

7、.14 4.6.15 4.6.15 4.6.16 4.6.16 4.6.17 4.6.17 4.6.17 - i/ Test specimens shall be cured as specified in 4.5.4. - 2/ There shall be no evidence of cracking, blistering, or loss or adhesion at -53.e1. 1C (-65 -OF). - 31 There shall be no evidence of cracking as a result of ozone exposure when viewed u

8、nder 7X magnification. - 41 Shrinkage values are based on cure cycles established in the specification. Changes in the cure cycle (lower temperature, etc) can yield lower shrinkage values. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I . - - -. -_

9、- MIL-M-BL797A BO 7979906 OLLOBZO 7 m - Composition Specification Size (inches) Steel, Alloy 4130 MIL-S-18729 3 x 6 x 1/16 Aluminum Alloy 2024 QQ-A-250/4 3 x 6 x 1/16 TABLE II. Quality conformance tests. (see 4.4.2.1) Number of specimens cut from each panel assembly 2 2 * Test variable Test specimen

10、 L/ Ozone concentration Exposure period Exposure temperature Magnification Requirement Requr emen t ASTM D 518, Procedure B 50 2 pphm (volume) 28 days 40 21“ C (104 22OF) 7x Before cure Initial Viscosity Isocyanate content Water content Cured polymer Hardness Tensile strength Ultimate elongation Spe

11、cific gravity I paragraph Test Requirement paragraph 3.5.1.2.1 3.5.1.3 3.5.1.4 Table I Table I Table I Table I 4.6.2.1 4.6.18 4.6.19 4.6.4 4.6.5 4.6.5 4.6.7 TABLE III. Panels for adhesion test. (see 4.6.10.1.1) 23 -. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-