"Form: This specification and its supplementary detail specifications cover glass cloth impregnated with a heat-reactive@ thermosetting@ addition-cure polyimide resin system@ the resin to be supplied in a ""B"" stage condition. Application: Primarily for laminated structural parts requiring high strength and long term heat resistance at temperature up to 450?? (232??) and short term exposure up to 554?? (290??). Classification: The material shall be as specified in the applicable detail specifications@ wherein each material is defined by form and property characteristics."