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.
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.
- Perlite Loose Fill Masonry Insulation (PDF) [REVISED]
- Thermal Performance of Masonry Walls Insulated with Perlite (PDF)
- Silicone Treated Perlite – Loose Fill Insulation (PDF)
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.
- Perlite for Non-Evacuated Cryogenic and Low Temperature Service (PDF) [REVISED]
- “Super” Insulating Perlite for Evacuated Cryogenic Service (PDF)
- Evacuated Perlite (PDF)
- Perlite as High Temperature Insulation (PDF) [REVISED]
- A Guide for the Bulk Handling of Expanded Perlite (PDF)
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.
- Underslab Insulation Using Perlite Bags (PDF) [REVISED]
- Perlite Chimney Lining Systems Solve Condensate Problems in Old and New Chimneys (PDF)
- Insulating Underground Pipe and Ducting with Perlite Insulating Concrete
- Perlite Insulating Concrete Pool Base for In-Ground Vinyl Pools
(for specifications on Aggregates for Perlite Concrete refer to ASTM C332)