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• Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian.
•  It occurs naturally and has the unusual property of greatly expanding when heated sufficiently.
• Perlite is not a trade name but a generic term for naturally occurring siliceous 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 from four to twenty times its original volume.
• This expansion is due to the presence of two to six percent combined water in the crude perlite rock.
• When quickly heated to above 1600°F (871°C), the crude rock pops in a manner similar to popcorn as the combined water vaporizes and creates countless tiny bubbles which account for the amazing light weight.
• Crude perlite ore is mined, crushed, dried in a rotary dryer, ground, screened, and shipped to expansion plants.
• Horizontal rotary or vertical stationary expansion furnaces are used to expand the processed perlite ore.
• Processing of the non-metallic minerals on the mine site involves crushing and grinding of the ore,the separation of the valuable minerals from the matrix rock through various concentration steps; and at some operations, the drying, calcining, pelletising and packaging of concentrates to ease further handling or refining.
• Annual world production of unexpanded perlite has increased by some 20%.
• Demand for perlite in horticulture continues to grow.
• Estimated world production of around 3.1Mtpy is believed to represent just 60% of installed production capacity.
• The uniqueness of this universal paste lies in the Perlite-based technology which makes for efficient cleaning, and a highly polished effect in a single application.
• Perlite used In the construction and manufacturing fields, it is used in lightweight plasters and mortars, insulation, ceiling tiles and filter aids.

• Perlite
• Marilla Perlite - Volcanic Glass Occurence, British Columbia, Canada
• Basic facts about perlite
• What Is Perlite

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