Perlite is an amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently. It is an industrial mineral and a commercial product useful for its low density after processing.
Exfoliated Perlite is an excellent ingredient for horticultural applications such as a soil amendment or alone as a medium for hydroponics or for starting cuttings. The color of exfoliated Perlite ranges from snowy white to greyish white. The exfoliated Perlite is light weight, clean, odorless, sterile, neutral pH (6.5-8.0), inert, non-toxic and environmentally safe. It is free from organic impurities, diseases, weeds, and insects, and resistant to surface moss and algae. The exfoliated Perlite is ideal for green roofs/terrace gardening, tissue culture, hydroponics, container growing, floriculture, home and interior gardens, nursery stocks, interiorscapes, ornamental plants, horticulture, vegetables, shrubs, fruit trees, cactus, xerophytes, bonsai suitable, seed starting, root cuttings, storing flower bulbs and tubers, potting mixes, soil-less growing mixes, landscaping, turfing industry, lawns, golf courses, etc. Note: Exfoliated perlite granules break into smaller particles due to self-abrasion and with more and more handling and transporting. The smaller particles, single grains and so called perlite dust are equally effective. The smaller particles and so called perlite dust (in fact these are smaller granules as perlite never break into dust size particles) are more effective as sum total of surface area of smaller particles is quite large and larger number of water molecules adhere to the surface which become available to the plants through roots during the dry period.