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MIL-R-46198 1988 Edition, January 7, 1988
Complete Document
Superseded By: ASTM PS93
Includes all amendments and changes through Cancellation Notice 1, September 22, 1998
Additional Comments: CNCL S/S BY ASTM PS93
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This material specification covers molded, unfilled or filled polyimide resin in the form of rod, bar, tube or slab, parts machined therefrom, and parts direct-formed from powder.

The materials covered in this specification are used primarily for parts requiring a combination of properties including self-lubricity and low coefficients of friction and thermal expansion coupled with heat resistance for continuous operations at temperatures up to 500°F (260°c) and for short-term excursions to 900°F (482°C).

The polyimide resin shall be of the following types and classes, as specified (see 6.2):
        Type I    Unfilled base resin
        Type II   Resin with graphite filler
           Class 1    15% by weight graphite filler
           Class 2    40% by weight graphite filler
           Class 3    15% by weight graphite and 10% by weight
                      fluorocarbon resin fillers
        Type III 15% by weight molybdenum disulfide filler

Note: Filler contents shown above are approximate. See Table I for exact composition.

Polymer composition shall be specified by use of type/class designations as described in Table I.

Manufacturing method and product form shall be specified by use of a suffix letter as described in Table II.

When applying the suffix letter, the type/class designation shall precede the letter. Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Director, US Army Laboratory Command, Materials Technology Laboratory, ATTN: SLCMT-MEE, Watertown, MA 02172-0001 by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.