Therm-O-Rock West started operation in Chandler, AZ in 1981.  Our focus is on producing the highest quality expanded perlite and vermiculite products for the horticultural and building industries.  We market our products through distributors, nurseries and “big-box” stores. We are listed as a certified producer of organic materials by the OMRI Institute   OMRI independently tests and certifies products as safe for organic gardening and applications under the USDA National Organic Program. State of the art blending and bagging lines are available for toll manufacturing of many types of powdered products.
Here are a few photos of our plant--from raw material delivery to shipping dock.