intumescent
/ˌɪntʃʊˈmɛs(ə)nt/
"in-tew-meh-scent"
Adjective: 1) (of a coating or sealant) swelling up when heated, thus protecting the material underneath or sealing a gap in the event of a fire, "the building features intumescent fire-retardant paints".
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| Source image: Ngrams/Google (CC BY 3.0) |
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