MIL-PRF-81733D
1.2.2 Classes. The classes of sealing compound are as follows:
Class 1 - Polysulfide rubber base material
Class 2 - Polythioether rubber base material
1.2.3 Grades. The grades of sealing compound are as follows:
Grade A - Contains chromate corrosion inhibitors
Grade B - Contains nonchromate corrosion inhibitors
1.2.4 Application time. The minimum application time, in hours, for each type and class is
indicated by a dash number as follows:
Type I, Class 1 - Dash numbers are -1/2 and -2
Type I, Class 2 - Dash numbers are -1/4, -1/2, and -2
Type II, Class 1 - Dash numbers are -1/6, -1/4, -1/2, -2, and -4
Type II, Class 2 - Dash numbers are -1/4, -1/2, -2, and -4
Type III, Class 1 - Dash number is -1
Type III, Class 2 - Dash number is -1
Type IV, Class 1 - Dash numbers are -12, -24, -40, and -48
Type IV, Class 2 - Dash numbers are -4, -12, -24, -40, and -48
Example: Type I-1/2 designates a brushable material having an application time of 1/2 hour;
Type I-2 designates an application time of 2 hours. All other types and dash numbers are
identified in a similar manner.
2. APPLICABLE DOCUMENTS
2.1 General. The documents listed in this section are specified in sections 3 and 4 of this
specification. This section does not include documents cited in other sections of this specification
or recommended for additional information or as examples. While every effort has been made to
ensure the completeness of this list, document users are cautioned that they must meet all
specified requirements documents cited in sections 3 and 4 of this specification, whether or not
they are listed.
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