This specification covers the requirements for filled, resinous thermosetting compound and sheet pre-preg to fabricate shims for use during assembly of aircraft and marine components and parts.

Classification

The material shall be classified in the three types as specified:

Type I - A two component material (base and hardener) which, after mixing and application of heat (350 °F), will cure to a hard, strong resin. Type I material may also be cured in ambient temperature of 75 °F ± 5 for a period of 96 hours minimum.

Type I Class A - A two component material (base and hardener) which after mixing may be cured to a hard, strong resin in ambient temperature of 75 °F ± 5 for a period of 9 hours.

Type II - A precatalyzed (B-staged) sheet material which will cure to a hard, strong resin with the application of heat. Type II material may also be cured in ambient temperature of 75 °F ± 5 for a period of 96 hours.

Type III - A precatalyzed (B-staged) material supplied frozen in a tube from which it can be extruded and cured to a hard strong resin with the application of heat (200 °F). Type III material may also be cured in ambient temperature of 75 °F ± 5 for a period of 96 hours minimum.