INTUMESCENT

noun
15 Scrabble
20 WWF
I 1
N 1
T 1
U 1
M 3
E 1
S 1
C 3
E 1
N 1
T 1

Definition

Any substance that swells on exposure to heat, thus increasing in volume and decreasing in density.

"Intumescents are used in some fire protection systems."

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