Overview

Perlite is a naturally occurring amorphous volcanic glass. Perlite ore has the unique property of expanding from 4 to 20 times its original size when heated sufficiently (12-15 times is typical). This process is referred to as expanding perlite.

 
 from left: crude perlite ore, crushed perlite ore, and expanded perlite

from left: crude perlite ore, crushed perlite ore, and expanded perlite

 various grades of expanded perlite aggregate

various grades of expanded perlite aggregate

 

The Perlite Story

 
 

Uses of Perlite

Expanded perlite is lightweight, inert, sterile, inorganic, odorless, incombustible, asbestos-free, non-toxic, rot proof, vermin proof, and pH-neutral. These inherent properties make perlite suitable for a variety of applications in horticulture, industry, filtration, construction, and insulation.

 

Horticulture

Industry

Insulation

Filtration

When used for the filtration of liquids, expanded perlite imparts no tastes, colors, or odors and is listed in the Food Chemicals Codex (published by the National Academy of Sciences), deeming expanded perlite safe for its intended use. Expanded perlite is also found in the EPA's Safer Chemical Ingredients List (SCIL) under Processing Aids and Additives. These characteristics make perlite an extremely safe and versatile mineral.

Construction