Glass Cloth TapesWoven insulating glass cloth; high temperature resistance; high mechanical strength UL Recognized.Scotch 27 & 69Product Brands*SelectProduct Desciption Temp Rating: Tape Thickness: 27 is Class B temp (130°C/266°F) 27 is 7 mil 69 is Class H temp (180°C/356°F) 69 is 7.5 mil