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

3.2.2.1 Kits. The base compound and the curing agent shall be packaged in individual

containers. The base compound shall be furnished in 1/2-pint, 1-pint, 1-quart, or 1-gallon

multiple friction top metal containers as specified by the acquiring activity. The appropriate

amount of curing agent shall be furnished in inert, nonmetallic jars having smooth, vertical inside

walls with screw caps (to facilitate removal of the curing agent). The air in the unfilled space of

the kit shall be replaced with an inert gas (nitrogen or carbon dioxide) immediately prior to

closing the container. The ratio of the quantity contained in the base compound container to the

quantity contained in the accompanying curing agent container shall be the same as the

manufacturer's recommended mixing ratio of the base compound and curing agent. Each curing

agent container shall be packaged with one base compound container with a separator between

the two containers in a manner which will prevent accidental separation but permit easy separation

for mixing purposes.

3.2.2.2 Sectional-type kits (Types I, II, and IV). The base compound and curing agent shall

be furnished in sectional-type 2-1/2-ounce or 6-ounce nonmetal containers, conforming to

MIL-S-38714, as specified by the acquiring activity. The total amount of base compound and

curing agent in each sectional-type container shall be as described below.

Base Compound and Curing Agent

Volume Tolerance

Kit Size

� 1/8 fluid ounce

2-1/2 ounces

2 fluid ounces

� 1/8 fluid ounce

6 ounces

3-1/2 fluid ounces

3.2.3 Marking of component containers. All component containers shall be marked with the

date of manufacture and the date of packaging.

3.2.4. Skin contact warning labels. Skin contact warning labels shall be added by the

manufacturer.

3.3 Performance characteristics.

3.3.1 Properties before cure.

3.3.1.1 Appearance. The base compound and curing agent shall be of uniform blend and

shall be free of skins, lumps, and jelled or coarse particles. There shall be no separation of

ingredients which cannot be readily dispersed by mechanical agitation or mixing by hand.

3.3.1.2 Color. Unless otherwise specified in the contract or order, the color of the sealing

compound shall be as furnished by the manufacturer (see 6.2). The curing agent, if furnished

separately, shall be of contrasting color to facilitate mixing.

3.3.1.3 Nonvolatile content. When tested as specified in 4.8.2, the nonvolatile content of the

freshly mixed compound shall be as specified in table I.