Perlite is a naturally occurring amorphous volcanic glass. Perlite has the unique property of expanding from 4 to 30 times its original size when heated sufficiently. This is known as expanded perlite.
Expanded perlite is lightweight, inert, sterile, inorganic, odorless, incombustible, asbestos-free, non-toxic, rot proof, vermin proof, and pH-neutral. Perlite is an extremely safe and versatile mineral.Used for the filtration, agriculture , horticulture, construction, insulation, etc.