ABOUT PERLITE
Perlite is not a trade name but a generic term for naturally occurring silicous 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 and other exceptional physical properties of expanded perlite.
This expansion process also creates one of perlite's most distinguishing characteristics: its white color. While our perlite rock is a light gray, it's color changes to white after expansion.
Expanded perlite can be manufactured to weigh as little as 2 pounds per cubic foot (32kg/m3) making it adaptable for numerous applications.
The expansion process will control many of the variables of the final product. In most instances (though not all)
our perlite is expanded in vertical furnaces. When the processed, unexpanded perlite is introduced into the furnace
it falls down towards the heat source. As it falls it begins to expand becoming bouyant in the air stream running through
the system. The furnace operator can control the density of the finished product by adjusting the temperature
and air flow in the furnace.
For more information you may contact us at:
American Perlite Company
11831 Vose Street
North Hollywood, CA 91605-5793
(818) 759-2255
or via e-mail at:
