1 1/2" x 5' Black 3M Scotchfil™ Electrical Putty. Can be wrapped, stretched or molded around irregular shapes for a quick, smooth insulation buildup. Insulates non-flat surfaces such as fittings and valves. Electrical grade, rubber-based, self-fusing putty tape insulates connections up to 600V. Non-corrosive synthetic rubber with peel-off liner.. Operational temperature range 32 - 176 degrees F.