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Intumescent

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

📖 Definitions of "Intumescent"

noun
  1. 1

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

    "Intumescents are used in some fire protection systems."

adjective
  1. 1

    That becomes swollen, especially upon exposure to heat

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