1000°F / 537°C  High Temperature & Heat Resistant Fiberglass Woven LadderTapeä:
Heat, Flame & Fire Resistant and Thermal Insulating with Graphite Coating
High Temperature Heat Resistant Graphite Coated Fiberglass Woven LadderTape Bolt Hole Tape
This high temperature LadderTapeä bolt-hole style tape is heat, flame and fire resistant.  Fiberglass (fibreglass or glass-fibre) woven tapes are fabricated from high quality type E fiberglass that will not burn and will withstand continuous exposure to temperatures of 1000°F / 520°C. This tape has a graphite coating providing excellent lubrication and additional protection from molten metals,

These high temperature tapes provide protection of industrial wires, cables, hoses, tube and pipe and also provide thermal insulation and personnel protection. Also used as a gasket or seal.  Available as a Plain tape or Drop-Warp tape (center longitudinal yarns missing), often called a bolt-hole tape or ladder tape.

This material resists most acids and alkalis and is unaffected by most bleaches and solvents.  It is flexible and conformable. 
High Temperature Fiberglass Woven
LadderTape with Graphite Coating
Top Photo: Plain tape
Bottom Photo: LadderTape (Drop warp or bolt-hole)