The Perlite Institute

Credit: The Perlite Institute Inc.

What makes this product green?

  • Reduces heating and cooling loads


The Perlite Institute is a trade association dedicated to the perlite industry, and lists 26 manufacturers of perlite insulation as members. GreenSpec lists the Perlite Institute for finding those manufacturers. The density of perlite ranges from 1.9–11.2 lb/ft2 and the R-valueMeasure of resistance to heat flow; the higher the R-value, the lower the heat loss. The inverse of U-factor. ranges from 2.4–3.7 per inch, increasing as the density decreases. Perlite is an amorphous volcanic rock that has fairly high water content. The natural rock is crushed and then rapidly heated to 1,600°F, which expands the granules from four- to twenty-fold, producing a lightweight insulating material with a density ranging from 1.9 to about 11 lbs/ft3. Perlite is commonly used to insulate hollow concrete masonry units.

Manufacturer Information

The Perlite Institute Inc.
4305 N. Sixth St., Ste. A
Harrisburg, PA 17110
Phone: 717-238-9723
Fax: 717-238-9985

Listed in: Blown Insulation