Ideal Industries Duct Seal, 5 lb. Block

Duct seal in dark gray putty color is ideal for sealing metal, masonry, wood or plastic. It offers 1.65 specific gravity and is non-toxic. It has calcium carbonate, magnesium aluminum silicate, crystalline quartz silica, butane polymer, synthetic polymer, carbon black, antioxidant, cellulose fiber, aluminum silicate, tall oil rosin and naphthenic wax composition. Duct seal is UL listed.

Seals around junction boxes, flashings and service entrances

Permanently soft, non-toxic compound can be painted immediately after application

Moisture and air barrier

Won't adversely affect other plastic materials or corrode metals