Definition of intumescent in English:

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intumescent

Pronunciation: /ˌɪntʃʊˈmɛs(ə)nt/

adjective

(Of a coating or sealant) swelling up when heated, thus protecting the material underneath or sealing a gap in the event of a fire: intumescent fire-retardant paints
More example sentences
  • Columns of the arcade are simply the rolled steel members of the frame, exposed and made silver with intumescent paint.
  • If alternative panels cannot be used then the ends of the sandwich panels must be sealed and locked together in a non-combustible wall intumescent seal.
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