The DS5 oil-based duct seal compound seals irregular openings to protect from air, dust or water while providing vibration dampening properties. The non-hardening sealant adheres to metal, masonry, wood or plastic. Duct Sealant is non-corrosive, non-toxic, contains no asbestos and will not stain or harm the users hands. Safe and easy to use with no unpleasant odor. Maximum temperature rating of 210 deg F (99 deg C). Dielectric strength 200 V/Mil. Color Green. 5 lb.