Shaft Liner's glass fibre-reinforced core is encased in a heavy duty linerboard. This enables it to resist fire and make it ideal for use as part of a fire rated wall or ceiling system.These panels also offer exceptional acoustic insulation properties and are used in Gyprock commercial wall and ceiling systems where a high fire rating or high acoustic performance is specified. Gyprock Shaft Liner can be identified by its blue coloured face paper.