Expanded Perlite


Perlite is not a trade name but a generic term for naturally occurring siliceous volcanic rock. The distinguishing feature which sets perlite apart from other volcanic glasses is that when heated to a suitable point in its softening range, it expands four to twenty times its original volume.


Expanded Perlite can be manufactured to weigh from 2 lb/ft3 (32 kg/m3) to 15 lb/ft3 (240 kg/m3) making it especially suitable for use in insulation applications. Perlite is used in the manufacture of high temperature and cryogenic insulation, lightweight perlite insulating concrete, insulating board, insulating plasters, masonry wall insulation and as under floor insulation.