MIL-P-47099A
3.2 Material. The polyurethane foam compound shall consist of a polyether type base resin and a separate isocyanate-type base resin and a separate isocyanate- type curing agent, so formulated as to produce, upon mixing, a polyurethane foam of a specified density certified by the manufacturer (see 6.2).
3.3 Storage life. The foam shall conform to the requirements of this specification after a storage period which shall be not less than 6 months for type I and III and 24 months for type II when stored in the original unopened container at a temperature between 16 and 32° Celsius (C) [60 and 90° Fahrenheit (F)]. The storage life shall be certified by the manufacturer (see 6.2).
3.4 Physical properties. The physical properties of the cured material shall be in accordance with table I (see 4.7).
TABLE I. Physical properties
Property |
Type I |
Type II |
Type III |
Density, lb/ft3 ------------------------ Tensile strength, psi, lb/in2) minimum ---------------------------- Compressive strength, psi, (lb) minimum ---------------------------- Shear strength, psi, (lb) minimum - Dielectric constant, maximum at 25°C(77°F) and 9375 MHz ------- Dielectric strength, V/mil, minimum ---------------------------- Dimensional stability, % increase in volume between -54°C(-65°F) and 68°C(155°F) ------------------ Flammability ------------------------- Temperature resistance, 1 hour at 86.9 ± 3°C(190 ± 5°F) (loss of properties) ------------------------- Humidity growth, % increase in volume, % loss of physical property values --------------------- Fungus resistance -------------------- |
2 ± 10% - 1 - 15 1.25 - 1.5 - - - - |
2 to 3 0 @ 25°C ± 1°(77°F ± 2°) 3 6 - 45 - self extinguishing None 10% 60% no fungus growth |
4 ± 10% - - 15 1.25 - 1.5 - - - - |
3.5 Workmanship. The polyurethane foam shall meet all requirements of this specification. The materials shall be clean and free of foreign matter, gel particles and
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