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Anonymous
Horticultural perlite (also known as volcanic glass) is the result of exposing perlite ore to high temperatures (expansion), reaching up to 15 times its original volume. Widely used in horticulture, it possesses the following characteristics:
CHEMICAL COMPOSITION:
SiO2 70-75%
Al2O3 12-15%
Na2O 3-4%
K2O 3-5%
Fe2O3 0.5-2%
MgO 0.2-0.7%
CaO 0.5-1.5%