A-A-52411A
2.4 Performance.
2.4.1 Tear resistance. The tear resistance of the insulation shall be not less than 4 pounds force per inch (ppi) when tested in accordance with ASTM D624, die C.
2.4.2 Tensile strength. The tensile strength of the insulation shall be not less than 25 pounds per square inch (psi) when the insulation is heat aged at 250 ± l0°F for 48 hours and tested in accordance with ASTM D412, die C.
2.4.3 Elongation. The elongation of the insulation when heat aged at 250±l0 °F for 48 hours shall be not less than 80 percent when tested in accordance with ASTM D412, die C.
2.4.4 Flammability. The burn rate of the insulation shall be not greater than 2 inches per minute when tested in accordance with SAE J369.
2.4.5 Impact resistance. When using a Gardner impact tester having a 1-kilogram dart with a 1.6 centimeter diameter, insulation 2 inches by 4 inches by 1-inch thick, shall be conditioned at 77 ± 5°F and 50 ± 5% relative humidity for 7 days and then conditioned at -50 ± 2°F for not less than 4 hours. While in this conditioned state the insulation shall be capable of withstanding an impact of not less than 15 centimeter-kilograms. After being allowed to return to room temperature for 15 minutes, the insulation shall be bent around a 2-inch radius bar in the tested area and examined for cracks or other evidence of failure.
2.4.6 Flexibility. Insulation, 1 inch by 8 inches by 1-inch thick, shall be conditioned at 77 ± 5°F and 50 ± 5% relative humidity for 7 days; 250°F for 4 hours with a 1-hour recovery at 77 ± 5°F; and -50 °F for 4 hours with a 1-hour recovery at 77 ± 5°F. While in this conditioned state, the insulation shall be capable of being bent around a 1-inch mandrel without cracking.
2.4.7 Acoustical performance. The acoustical performance of 1-inch thick insulation mounted on 20-gauge steel shall be as specified in table I and tested in accordance with ASTM E90.
TABLE I. Noise barrier properties.
|
Frequency (hertz) |
Sound transmission loss (decibels) |
|
160 |
16 |
|
250 |
20 |
|
500 |
21 |
|
1000 |
36 |
|
2000 |
50 |
|
4000 |
58 |
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