Perlite as Insulation

The Benefits of Perlite as Insulation

When perlite ore is expanded by exposure to rapid, controlled heating, it grows up to 20 times its original volume and takes on a foam-like cellular internal structure — essentially clusters of microscopic glass bubbles. This physical transformation makes expanded perlite an extremely efficient, low density insulator. (For a detailed explanation of perlite expansion, see: Why Perlite Works).

As detailed below, perlite is inorganic and non-combustable, and the loose-flowing nature of expanded perlite is ideal for filling odd-shaped spaces.

Masonry Fill Perlite

Expanded perlite provides a quick, inexpensive and permanent method for insulating masonry walls. Depending upon design conditions, reductions in heat transmission of 50 percent or more can be obtained when perlite loose fill is used in the hollow cores of concrete block or cavity type masonry walls. Perlite is a non-combustible, industrial mineral yielding superior dynamic thermal performance.

Cryogenic/High Temperature Insulation

Super-cold cryogenic fluids such as hydrogen and helium are normally stored in double-walled vessels with perlite-filled annular spaces.

Other Insulation Applications

Perlite insulation is an inorganic product that does not support combustion, or rot, nor does it provide a habitat for rodents. It is ideal for use under concrete slabs, in chimneys and in high-temperature applications such as pizza ovens and rocket stoves.

Industry Association Links

• National Insulation Association
• North American Insulation Manufacturers Association
• Insulation Contractors Association of America