Perlite is highly siliceous volcanic glass, containing from 2 to 5 percent combined water. When rapidly heated to the proper temperature, the vaporization of the water and the simultaneous softening of the glass, cause the perlite to suddenly expand, or “pop” into lightweight cellular particles. The control of this expansion and milling technology results in engineered products suitable for specific functions in a variety of applications.

Important physical properties of Perlite include:
• Unique particle shape and size
• Absorption properties
• Chemical and thermal stability
• Inertness
• Microporosity
• Large surface area
• Very low bulk density (lightweight)
• Inter-locking Ability
• Rigidity, but more flexible than DE

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