Loctite Pro Gaps & Cracks Foam is a fire rated insulating foam sealant that fills gaps up to 1 inch to seal out air, moisture & pests. This foam is ready to be used with any standard foam gun applicator which provides superior control and reusability. This foam is recommended for standard gap filling applications like wiring, plumbing and HVAC penetrations. It can also be used in areas where a fire rated foam is needed. The foam is orange in color and is designed to resist the migration of fire & hot gasses in Type V residential (wood frame) construction.