NPFC - MIL-I-631
INSULATION, ELECTRICAL, SYNTHETIC-RESIN COMPOSITION, NONRIGID
| Organization: | NPFC |
| Publication Date: | 15 November 1961 |
| Status: | active |
| Page Count: | 32 |
scope:
This specification covers only the basic characteristics required by the synthetic insulation material, as such, and the methods suited to their satisfactory determination.
Electrical insulation shall be of the following types, as specified (see 6.2):
Type A - Polyethylene.
Type B - Cellulose acetate butyrate.
Type C - Cellulose acetate or cellulose triacetate.
Type D - Ethyl cellulose.
Type E - Vinylidene chloride copolymer.
Type F - Polyvinyl chloride and its copolymers.
Type G - Polyethylene terephthalate.
Electrical insulation shall be furnished in the following forms, as specified (see 6.2):
Form F - Film, in rolls (types B, C, D, and G only).
Form S - Sheet, fiat or in rolls.
Form T - Tape.
Subform Tf - Film tape (types B, C, D and G only).
Subform Ts - Sheet tape.
Form U - Tubing (see 6.7)
Subform Ua - American-wire-gage size (AWG size) (types A, E and F only).
Subform Ub - Cable-end-sealing size (type F only). (see 6.8)
Type F electrical insulation shall be furnished in the following grades, as specified (see 6.2):
Grade a - General purpose.
Grade b - Low temperature (form U only).
Grade c - High temperature (form U only).
Electrical insulation shall be furnished in the following classes, as specified (see 6.2):
Class I - Fungus resistance required.
Class II - Fungus resistance not required.
Type F, form U tubing shall be furnished in the following category:
Category 1 - Flame resistance required.
intended Use:
This type of material is intended for ultra high-frequency applications. It possesses excellent electrical properties which remain practically constant oyer a wide range of frequencies,... View More
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