MIL-M-46862B (MI)
3. REQUIREMENTS
3.1 First article sample. Unless otherwise specified (see 6.2), a first article sample shall meet all the requirements of this specification.
3.2 Material.
3.2.1 Composition. The material shall be a pre-mix consisting of a glass reinforcement impregnated with an epoxy resin system (see 4.5.4.1).
3.2.1.1 Reinforcement. The reinforcement shall meet the requirements of MIL-R-60346, Type I, K-37 Glass, Class 1, except that it shall be chopped. Reinforcement shall consist of 50 ± 5% by weight of 0.250 ± 0.062 inch long fibers and 50 ± 5% by weight of 0.125 ± 0.062 inch long fibers (see 4.5.4).
3.2.1.2 Resin system. The resin system shall consist of epoxy resin conforming to MIL-R-9300, Type I, Grade 0, Form A, modified with a suitable elastomer (see 4.5.4.4).
3.2.2 Storage life. The material as furnished by the manufacturer shall be capable of meeting the requirements specified herein after storage at a maximum temperature of + 4.4° Celsius (C) for not less than 90 days (see 4.5.4.2).
3.3 Performance characteristics.
3.3.1 Physical and chemical properties. The physical and chemical properties of the material shall be as specified in Table I.
TABLE I. Physical and chemical properties.
Characteristics |
Average |
Individual |
||
Minimum |
Maximum |
Minimum |
Maximum |
|
Resin content, % by weight |
42 |
52 |
40 |
55 |
Volatile content, % by weight |
-- |
0.5 |
-- |
0.8 |
Specific gravity |
1.50 |
-- |
1.48 |
-- |
Gel time, minutes |
2.5 |
5.0 |
2.0 |
5.5 |
3.3.2 Mechanical properties. The mechanical properties of the material shall be as specified in Table II.
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