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Raw Perlite Ore
The Mine

We Mine and crush this product with precision; and supply Perlite expanders in California and the Pacific North West

Perlite Origin and Characteristics​


The crude rock may range from transparent light gray:To glossy black

Raw Perlite Rock


Perlite is a naturally-occurring siliceous rock. The distinguishing feature that sets perlite apart from other volcanic glasses is that when heated to a suitable point in its softening range, it expands from four to twenty times its original volume.

Crushed Perlite Rock

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Expanding Perlite 
The Expansion Process​

This expansion is due to the presence of two to six percent combined water in the crude perlite rock. Expanded perlite can be manufactured to weigh as little as 2 pounds per cubic foot (32kg/m3), making it adaptable for numerous applications.​


      Furnace Expanding Perlite​

Click on the slide show to watch a

furnace making perlite


Because perlite is a form of natural glass, it is classified as chemically inert and has a pH of approximately 7.

This expansion process also creates one of perlite most distinguishing characteristics: its white color.

Expanded Perlite
Why Perlite Works

Expanded perlite particles are clusters of minute, lightweight, insulating, glass bubbles.


       Microscopic View Expanded Perlite


Its unique internal structure, together with a large exterior irregular surface composed of broken bubbles and surface openings provide for water and air holding capacity.

Its internal structure resists thermal transmission, and crushed particles present a maze of microscopic pathways that can be used to filter and clean a wide array of liquids

The color of expanded perlite ranges from snowy white to grayish white.

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