Pipe wraps and collars are necessary passive fire protection devices when plastic pipes enter walls, floors and ceilings with no adequate seal. They can be retrofitted on all types of pipe where the pipe passes through fire-resistant structures like walls and floors.
Pipe wraps are made from layers of graphite-based intumescent sheet. When the graphite reaches a certain temperature, it expands rapidly to crush the pipe. This seals off the pipe to prevent the spread of fire and smoke through the pipe.
Pipe wraps and pipe collars should be used wherever plastic pipes are a fire safety risk. Any pipe that could be compromised by fire needs to have a protective wrap or collar to ensure adequate compartmentation control.
The difference between a wrap and a collar is a collar has a metal band. This forces the material to expand inwards. Wraps need to be installed within a solid wall so the material has no choice but to expand inwards. Collars are more universal for this reason.