Airborne equipment environmental testing …
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Darchem Flare of Stillington Stockton-on-Tees Cleveland TS21 1LB UK

Resistance to Fire in Designated Zones

One approach to reducing the susceptibility to fire of aircraft on-board electronics is the creation of shielded zones through conductive termination of the existing metal airframe structure. This can be accomplished by replacing conventional nonconductive reinforced silicone and fluorosilicone airframe seals with conductive equivalents.
Some applications demand a fireproof or fire resistant,
reinforced, conductive seal. In other cases, the seal must survive the effects of a lightning strike.

Flammability testing

Flammability testing can be performed using the guidelines of FAA Advisory Circular (AC) 20-135, Aircraft interiors fire performance FAA 14 CFR:Part 25 or for airborne equipment: Resistance to Fire in Designated Zones ISO 2685:1998.

The aircraft industry's definition of fireproof is: The capability of a material or component to withstand, as well as or better than steel, for 15 minutes minimum, while still fulfilling its purpose. The term "fireproof" , when applied to materials and parts used to confine fires within designated fire zones, means that the material part will perform this function under conditions likely to occur in such zones and will withstand, 2000° F flame (1093° C) for 15 minutes minimum.
The pass criteria for conductive seals, when tested under normal static load conditions, requires that the seal shall not allow flame passage, and shall not exhibit any burnthrough of the flame nor any back-side burning. The pass criteria does not require that the gasket maintains its pretest mechanical or electrical performance following completion of the burn.