WHAT IS PERLITE?
Perlite is not a trade name but a generic term for naturally occurring siliceous volcanic 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 process is due to the presence of two to six percent combined water in the crude perlite rock. When quickly heated to above 1600 F (870 C) the crude rock pops in a manner similar to popcorn as the combined water vaporizes and creates countless tiny bubbles in the softened glassy particles. It is these tiny glass-sealed bubbles which account for the amazing lightweight and other exceptional physical properties of expanded perlite.
The expansion process also creates one of perlite's most distinguishing characteristics: its white color. While the crude perlite rock may range from transparent to light gray to glossy black, the color of expanded perlite ranges from snowy white to grayish white.
Expanded perlite can be manufactured to weigh from 2 lbs/ft3 (32 kg/m3) to 15 lb/ft3 (240 kg/m3) making it adaptable for numerous uses, including filtration, horticultural applications, insulation, inert carriers and a multitude of filler applications.
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PERLITE AS AN ADSORBENT
Expanded perlite can be used to control and clean up liquid spills. The perlite may also be used to provide rapid deodorizing and dehydration of animal waste liquids. In these applications, the perlite may be used in granular form or compressed into pellets of the desired size and shape. Perlite also is suggested as an adsorbent media in enclosed containers for the disposal of liquid toxic waste substances.
By activating the expanded perlite with hydrochloric acid and/or sulfuric acid the material can be used as a purifying agent for waste and process waters.
PERLITE AS A CARRIER
Expanded perlite is recommended as a carrier for pesticides, feed concentrates, herbicides, and other similar applications.
As a carrier for feed concentrates, perlite will readily adsorb the concentrate while remaining free flowing (anti caking), and chemically resistant to microbiological degradation. The perlite also permits quick liquid movement between the carrier surface and the recipient of the feed concentrate.
