Industrial Perlites - Non-Milled


Ryolex is our brand of expanded perlites we refer to as macroparticles. These coarser particles are produced by heating crushed perlite between 1600 and 1800 F, causing the particles to expand 4 to 20 times due to the vaporizing of water in the rock. This expansion accounts for Ryolex’s light weight and other exceptional physical properties.

We make Ryolex in both non-milled and milled forms.


Ryolex uses range from multiple insulation applications that are easy and effective to lightweight cat litter that is extremely absorbent. Perlite is an inorganic, naturally occurring mineral that does not decay or decompose. We apply non-flammable water repellent treatment to certain Ryolex grades, which significantly improves the water-repellent properties of perlite.

The many applications of non-milled Ryolex include:

  • Lightweight fillers
  • Fireblock
  • Cat litter
  • Chimney lining
  • Ceiling tiles
  • Plaster aggregate
  • Lightweight concrete
  • Refractory applications
  • Various types of insulation


Once exposed to rapid, controlled heating, the expanded perlite takes on a foam-like structure of microscopic glass bubbles that contain a multi-cellular core. These clusters of glass bubbles have many unique qualities that offer great advantages in industrial uses. In addition to being lightweight, Ryolex is non-toxic, non-combustible, naturally insulating, and can safely be used over a wide range of temperatures.

Perlite Benefits

  • Significant energy savings when used in concrete masonry
  • Increases R-Value
  • Decreases U-Value
  • Shrink and/or crack resistance as a filler
  • Non-carcinogenic
  • Efficient, low-density insulator
  • Non-toxic
  • Non-combustible
  • All-natural mineral

Chemical Analysis

SiO2Silicon Dioxide73%

Al2O3Aluminum Oxide17%

K20Potassium Oxide5%

Na20Sodium Oxide3%

CaOCalcium Oxide1%

Trace Elements1%

Physical Properties

Hydroscopic Moisture 0%

Surface pH 6.5-7.5

Color White

Fusion Point (°F) 2300

Fusion Point (°C) 1260

Trace Elements

Manganese < 0.3%
Sulfur < 0.2%
Titanium < 0.1%
Barium < 0.1%
Gallium < 0.05%
Boron < 0.01%
Chromium < 0.0075%
Zirconium < 0.003%
Molybdenum < 0.002%
Nickel < 0.002%
Copper < 0.0015%
Lead < 0.001%*
Arsenic < 0.001%
Chlorine < 0.0005%

All analyses are shown in elemental form even though the actual forms present are mixed glassy silicates. Free Silica may be present in small amounts, characteristic of the particular ore body.

*By Food Chemicals Codex Method