DOWSIL™ 3-6548 RTV silicone foam is a two-part room temperature vulcanising (RTV) silicone foam. DOWSIL™ 3-6548 RTV combines fire resistant properties with good flexibility under demanding conditions. It is designed to contain hazards such as smoke, fire and gases. DOWSIL™ 3-6548 RTV silicone foam can also be used to seal buildings against harmful contaminants such as dirt, dust and water.