Fibreglass is the main replacement material for asbestos insulation. Fibreglass has an exposure standard of 1 fibre per cubic centimetre air.

Fibreglass has a wide variety of usages ranging from home insulation in the attic, to pipe and boiler insulation in the plant. Problems with fibreglass can occur when it is mechanically transformed. For instance, grinding can produce a lot of airborne fibres that need to be controlled. In cases like this, air monitoring for fibres is recommended to determine the level of fibre generation.