MIL-PRF-23586F
3.3 Physical properties.
3.3.1 Properties before cure.
3.3.1.1 Appearance. The base compound and curing agent shall be uniform and free of skin,
jelled or coarse particles. There shall be no separation of components that cannot be dispersed by
mechanical agitation or hand mixing. The sealing compound shall be furnished in the
as-manufactured color.
3.3.1.2 Nonvolatile content. The nonvolatile content of each type mixed sealing compound
shall be not less than 98 percent when tested as specified in 4.7.2.
3.3.1.3 Viscosity, based compound. Viscosity of the base compound, in poises, when tested
as specified in 4.7.3, shall be as follows:
Type I -
200, maximum
Type II -
200 to 2,000
Type III -
5,000 to 20,000
3.3.1.4 Pot life. When tested as specified in 4.7.4.1, pot life shall be as follows.
Class 1 - 15 to 45 minutes
Class 2 - 1 to 3 hours
Class 3 - 3 to 7 hours
Class 4 - 8 hours, minimum (Grade B-2)
3.3.1.5 Application time Grade B-2 (classes 1, 2, and 3) only. Application time shall be
determined by a viscometer in accordance with 4.7.4.2. The viscosity at the end of the rated
application time shall be as follows:
Type I -
400 poises, maximum, after 45 minutes.
Type II -
2,000 poises, maximum, after 1.5 hours.
3.3.2 Properties after cure.
3.3.2.1 Physical properties. Physical properties of the cured sealing compound shall be as
specified in table I.
3.3.2.2 Corrosion. The encapsulated wire shall not exhibit more corrosion than the corrosion
on the control wire, when tested as specified in 4.7.16.
3.3.2.3 Reversion (deep section cured) resistance (Grades B1 and B2). Reversion resistance
shall consist of a deep section cure, followed by heat aging. The as-cured hardness, when
determined in accordance with 4.7.17, shall be not more than 5 points less than the as-received
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