Duct and Insulation Tapes 600 Series   –  Premium nuclear grade, waterproof   –  Premium nuclear grade; waterproof, polycoated cloth; natural rubber adhesive (silver and colors available). Indoor/outdoor tape used in nuclear power plants applications to seal end caps on stainless steel pipes, hold labels/signs on stainless steel pipes and seal HVAC metal duct work. Meet Specs: ANSI No. 45.2.2; NRC Guide 1.38.   –  Carolina Tape   –