Ideal 31-605 Duct Seal, 5 lb. Block
Moisture and air barrier
Seals around junction boxes, flashings and service entrances
Permanently soft, non-toxic compound can be painted immediately after application
Won't adversely affect other plastic materials or corrode metals
IDEAL 1 lb. 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.