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1.1 This specification is intended to be a means of calling out finished plastic parts ready for industrial or consumer use.
1.2 This specification covers finished parts and shapes from which parts are machined, made from a semi-crystalline polyimide (PI).
1.3 This specification is intended to replace MIL-R-46198 and Provisional Standard Specification PS 93.
Note 1—There is no known ISO equivalent to this standard.
1.4 This specification covers parts made from semi-crystalline polyimide, which is a thermosetting material that shows no softening or melting by DMA (D4065) at or below 260°C (500°F).
1.5 Since PI is a thermoset resin, no provisions are included for recycled products.
1.6 The classification system outlined in this specification is intended to be identical to that used by Department of Defense for over 20 years. No changes are intended at this time.
1.7 The values are stated in SI units and are regarded as standard in all property and dimensional tables. For reference purposes, inch-pound units are stated in parentheses.
1.8 Application—Parts in this specification are generally used for applications requiring the following combination of properties: low coefficient of friction, and low thermal expansion coupled with heat resistance for continuous operation at temperatures up to 260°C (500°F) and for short-term excursions upward to 482°C (900°F).
1.9 The following precautionary caveat pertains only to the test method portion, Section 12, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D638 Test Method for Tensile Properties of Plastics
D695 Test Method for Compressive Properties of Rigid Plastics
D790 Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D883 Terminology Relating to Plastics
D1600 Terminology for Abbreviated Terms Relating to Plastics
D1708 Test Method for Tensile Properties of Plastics by Use of Microtensile Specimens
D3892 Practice for Packaging/Packing of Plastics
D4065 Practice for Plastics: Dynamic Mechanical Properties: Determination and Report of Procedures
E8 Test Methods for Tension Testing of Metallic Materials
ANSI StandardZ1.4 Standard for Sampling Plans and Tables for Inspection by Attributes Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036., Replaced MIL-STD-105.
Military StandardsMIL-STD129 Standard Practice, Military Marking for Shipment and Storage
ICS Number Code 83.140.01 (Rubber and plastic products in general)
UNSPSC Code 13111018(Polyimide resin)