intumescent
/ˌɪntjuːˈmesənt/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（涂料表层或密封剂等）受热膨胀的（以在着火时保护下面的材料或密封裂缝）：
intumescent fire-retardant paints.
受热膨胀并阻燃的油漆。