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Flame retardant
A substance used to impede a material's tendency to burn or ignite.

Flame roll-out
A dangerous situation that occurs when flame is pushed out of the bottom of a combustion appliance. It can lead to fires.

Flame spread
A measure of relative combustibility. The flame spread of a tested material is rated relative to asbestos cement board (flame spread = 0) and red oak flooring (flame spread = 100).

Flame spread classification
A measure of the surface burning characteristics of a material.

Flame spread rating
A measure of the relative flame spread, and smoke development, from a material being tested. The flame spread rating is a single number comparing the flame spread of a material with red oak, arbitrarily given the number 100 and asbestos cement board with a flame spread of 0. Building codes require a maximum flame spread of 25 for insulation installed in exposed locations.

Flame-cut
Metal cut with a torch.

Flame-proof
Something not easily damaged by fire or which does not catch on fire. Non-combustible.

Flame-proof cloth

Flammability
The ability of a material to burn or ignite.

Flammable
Easily set on fire. Easily ignited.

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