Sustainability Fact Sheet [PDF]

—Physical Characteristics of Perlite [PDF]

Health Effects of Perlite [PDF]

The Perlite House [PDF]info-sheet library


National Insulation Association

North American Insulation Manufacturers Association

Insulation Contractors Association of America



portable perlite expander

ABOVE: A portable perlite furnace for on-site expansion. (Photo: A&B Group)

BELOW: An LNG tanker ship insulated with perlite.

LNG tanker
Cryogenic storage facility filling masonary cavity with perlite

TOP: A cryogenic cold box storage facility.

ABOVE: Lightweight perlite pours easily into masonry blocks without requiring special equipment or skills.

BELOW: Underslab insulation using unopened perlite bags placed on grade.

placing perlite bags perlite bags in place for underslab insulation

Perlite as Insulation

Perlite is a versatile and sustainable mineral that is mined and processed with a negligible impact on the environment. The green community recognizes perlite-enhanced products—like insulation—as a high-performance solution drawn from a natural material of nearly unlimited supply throughout the world.

The Benefits of Perlite as

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 PDF Infosheet: 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.