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MIL-PRF-81733 Sealing And Coating Compound, Corrosion InhibitiveThis specification covers accelerated, room temperature curing synthetic rubber compounds used in the sealing and coating of metal components on weapons and aircraft systems for protection against corrosion. The Class 1 sealing compound is effective over a continuous operating temperature range of ??65?? to +250?? F \(??54?? to +121?? C\). The Class 2 sealing compound is effective over a continuous operating temperature range of ??80?? to +320?? F \(??62?? to +160?? C\).

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MIL-PRF-81733D
TABLE I. Nonvolatile content.
Nonvolatile Content, minimum percent by weight
Type
Class 1
Class 2
I
84
84
II
92
92
III
65
65
IV
90
95
3.3.1.4 Flow (Type II only). When tested as specified in 4.8.3, the flow measurement of the
sealing compound shall be not less than 0.10 inch and not greater than 0.75 inch.
3.3.1.5 Application life. Application life shall consist of the initial viscosity of the base
compound and an application time measurement of the mixed compound (see 4.8.4).
3.3.1.5.1 Initial viscosity. When tested as specified in 4.8.4.1, the initial viscosity of the base
compound shall be as specified in table II.
TABLE II. Initial viscosity.
Type
Application
Viscosity, poises
I
Brush or dip
100­500
II
Extrusion or injection, gun or spatula
6,000­16,000
III
Spray
50­150
IV
Faying surface injection, gun or spatula
1,000­4,000
3.3.1.5.2 Application time. When tested as specified in 4.8.4.2, the application time of the
compound that is prepared according to the manufacturer's instructions shall be as specified in
table III. The end of the application time shall be considered to be not greater than 2,500 poises
for Type I, not less than 15 grams per minute for Type II, not greater than 300 poises for Type
III, and not less than 30 grams per minute for Type IV, Class 1 or 50 grams per minute for Type
IV Class 2.
3.3.1.6 Tack-free time. When tested as specified in 4.8.5, the sealing compound shall cure
to a tack-free condition within the time specified in table IV.
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