Perlite
Mineralogy
Perlite is a generic term for naturally occurring siliceous rock, which contains
water that expands into steam to produce
a foamed structure. Perlite is distinguished from other volcanic glasses in that when heated to a suitable point, it expands from four to twenty times its original volume. This expansion is due to the presence of two to six percent water in the crude perlite rock. The rock pops like popcorn creating tiny bubbles which account for the amazing light weight and other exceptional physical properties of expanded perlite.
Perlite, or volcanic glass, is formed when lava in the form of molten rock spews out of a volcano, and cools in a rapid manner. During cooling water is trapped within the rock and the lava forms into a glass-like structure.
Physical properties
- Lightweight
- Excellent thermal and acoustic insulating properties
- Elasticity
- Fire resistance
- Wide range of particle sizes
Applications
In paints perlite is the most effective matting agent and in varnishes it provides matting and transparency.
In dry mixes and ready to use plasters, perlite is an excellent additive for light weighting
The careful processing of perlite results in soft, fine particles suitable for use in a variety of personal care products where high purity, gentle abrasion, high absorption and matting effect are desired. Used in scrub applications, perlite is an excellent eco-friendly alternative to polymer micro-beads.
