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This specification establishes the requirements for carbon fiber PMR-15 polyimide resin prepreg in the form of unidirectional tape suitable for the fabrication of structural laminates intended for extended use at temperatures up to and including 316°C (600°F).

The designation PMR-15 stands for a high temperature resistant polyimide resin system (designated PMR, for polymerization of monomer reactants) developed at NASA-Lewis Research Center. The imide oligomer before curing has a nominal molecular weight of 1500, which gives rise to the designation PMR-15.

The carbon (graphite) fiber polyimide (PMR-15) resin impregnated unidirectional tape conforming to this specification is termed a "prepreg" material (i.e., preimpregnated). The unidirectional prepreg tape described in this specification is a composite material in which the polyimide resin is partially cured and the carbon fiber reinforcement is oriented in one direction (i.e., unidirectional). Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Director, U.S. Army Laboratory Command, Materials Technology Laboratory, Watertown, MA 02172-0001 by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

The following abbreviations are used in this specification to describe chemical constituents:

Abbreviation Chemical Name NE Monomethylester of 5-norbornene-2,3-dicarboxylic acid HDA Methylenedianiline BTDE Dimethylester of 3,3',4,4'-benzophenonetetracarboxylic acid BTDA 3,3',4,4'-benzophenonetetracarboxylic dianhydride BTCA 3,3',4,4'-benzophenonetetracarboxylic acid BTME Trimethyleater of BTCA BTTE Tetramethylester of BTCA NE acid 5-norbornene-2,3-dicarboxylic acid NDME Dimethylester of 5-norbornene-2,3-dicarboxylic acid

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