High-temp foundry applications

ABOVE: Perlite has application as a high-temperature insulation in foundry cores, molds, and ovens, and as a crucible topping.

BELOW: LNG tanker, insulated with perlite.

LNG supertanker insulated with perlite

pipe insulation using perlite

ABOVE: Temperlite brand pipe insulation from ITW Insulation Systems.

Perlite in Industry

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 as a high-performance solution drawn from a natural material of nearly unlimited supply throughout the world.


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. (For a detailed explanation of perlite expansion, see PDF Infosheet: Why Perlite Works).

Over half of all the perlite expanded in the United States annually is used to make “formed products.” These products include ceiling tiles, pipe insulation, roofing board and fire-rated door cores, and are manufactured with a variety of binders.

Pelite can safely be used over a wide range of temperatures. Being lightweight, non-combustable, and insulating, perlite has been found to be useful in a wide variety of industrial applications, e.g., refractory brick, high temperature insulation, molten metal topping, cryogenic insulation, filtration, and lightweight fillers.

INformation sheets

(linked PDF files from the Perlite Institute Library)

—PERLITE AS A FILLER

—Other Industrial uses