MIL-PRF-8516G
3.2.3 Toxicity. The sealing compound, when used for its intended purpose, shall have no
adverse effect on the health of personnel.
3.2.4 Shelf life. The shelf life of the sealing compound shall be not less than 9 months.
Sealing compound which has exceeded its shelf life may be retested to extend storage (see 6.5).
3.3 Performance characteristics.
3.3.1 Properties before cure.
3.3.1.1 Color. Unless otherwise specified in the contract or order, the base compound shall
be supplied in the manufactured color and shall contrast with the curing agent to facilitate mixing
(see 6.2). The material shall not be red in color.
3.3.1.2 Consistency during electrical connector sealing (potting) operations. The mixed
sealing compound shall be pourable at normal temperatures, but shall not flow through
connectors during electrical connector sealing (potting) operations (see 4.6.1.3).
3.3.1.3 Application life. When tested in accordance with 4.9.2.1, the mixed category A
sealing compound shall meet the requirements of initial viscosity (see 3.3.1.3.1) and application
time (see 3.3.1.3.2).
3.3.1.3.1 Initial viscosity. The initial viscosity of the mixed compound shall be:
Type
Initial viscosity
I
100 to 400 poises
II
401 to 1,200 poises
3.3.1.3.2 Application time. The application time (minimum time to reach 1,000 poises for
type I and 2,500 poises for type II) of the mixed compound shall be:
Class
Minimum
time
1
30 minutes
2
60 minutes
3
120 minutes
3.3.1.4 Nonvolatile content. When tested in accordance with 4.9.2.2, the nonvolatile
content of the mixed sealing compound shall be not less than 94 percent.
3.3.1.5 Accelerated storage. When tested in accordance with 4.9.2.11, the mixed compound
shall not deviate from the initial viscosity (see 3.3.1.3.1) by more than plus 35, minus 5 percent
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