Gardner Bender Duct Seal Compound Plugs is a dough-like material that is easy to handle. This material helps seal and protect gaps, holes and conduit openings against dust, moisture, drafts and noise. This material is non-toxic, non-corrosive and non-staining. This seal can be used in temperatures that range between -20 degree F up to 350 degree F. Features: Dough-like material Helps seal conduit openings, gaps and holes against drafts, dust, moisture and noise Easy to handle Simple to install Under normal conditions the material will not harden or form a skin Non-conduction Non-deteriorating Non-toxic Non-corrosive Non-staining Non-curable Flash point is over 550 degree F Temperature ranges between -20 degree F to 350 degree F