Multiwraps have been extensively used by the London Underground and abroad during refurbishment of existing bitumen and cloth joints located on the tunnel walls. 

A lightweight glass fibre cloth is laminated to a .5mm thick graphite intumescent membrane. The glass fibre cloth gives the Multiwrap tensile strength allowing the intumescent membrane expand around the joint to stifle the affect of heat in a fire. Multiwraps are a much cleaner and quicker method of repairing damaged or low voltage joints that are at the end of their lifespan.

Download Tyco Fire Joint
Download Toxic Fume Emission Test
Download Smoke Test Report