Fire protection covering for small diameter missiles

Details Fire protection covering for small diameter missiles Fire protection covering for small diameter missiles

1977-11-25

1979-05-29

Derrington, James H.

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

260 37EP, 260830S, 264102, 264145, 264151, 264175, 264236, 244121, 428413, 428414, 428418, 428421, 428920, B29D 714, B29D 720

Patent

active

041567528

ABSTRACT:
New, flexible intumescent protection sheeting of unusually uniform thickness have been prepared from epoxy-polysulfide compositions containing microfibers and the ammonium salt of 1,4-nitroaniline-2-sulfonic acid, as disclosed in U.S. Pat. No. 3,663,464, except that an ammonium salt particle size in the order of 5 to 8 microns and a fiber size of about 1/128th inch in length and 3 to 5 microns in diameter have been found critical to obtain the required density of 1.46 to 1.50 g/cc. The insulation sheeting is prepared by a continuous process involving vacuum mixing, calendering, and curing under very strict conditions which depend to some extent upon the thickness of the sheet produced.
The resulting flexible sheet can be wrapped easily and tightly around small diameter missiles, thus affording them for the first time, protection from fire for at least 5 minutes. The material is also suited for the protection of other articles with convoluted or contoured surfaces, which require covering of highly uniform thickness.

REFERENCES:
patent: 3539474 (1970-11-01), Sommer
patent: 3635847 (1972-01-01), Evans et al.
patent: 3635880 (1972-01-01), Lamboy et al.
patent: 3663464 (1972-05-01), Sawko et al.
patent: 3969314 (1976-07-01), Grigull
National Aeronautics and Space Administration, CR-137706, (Jul. 1975).

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