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Early History:

Perlite is a naturally occurring volcanic glass.  Various names were used to describe the mineral, but by 1822 it was being referred to as "perlite."

There are reports of early investigations being carried out in Japan in 1929.  In the mid to late 1930's, many people were working in America to find uses for the material.  In 1938, experiments were started in Superior Arizona by L. Lee Boyer, who later in that year made an application for a patent for a process to expand perlite and convert it to an insulating or refractory material.

The World War brought a temporary halt to the industry's development until the late 1940's and early 50's when work progressed in the USA and Holland.

Information given herein is from sources considered reliable, but no guarantee of accuracy can be made or liability assumed.  Your supplier may be able to provide you with more precise data.  Certain compositions or processes involving perlite may be the subject of patents.
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