Expanded lightweight perlite. It is an inorganic, natural mineral, environmentally friendly. Its characteristics include excellent thermal and sound insulation properties and fire retarding and non-combusting ability. It does not deteriorate through the years, exhibits extended shelf life, it is robust to rot or decay and does not react with mineral and organic acid at all temperatures. When used in horticulture, perlite promotes drainage and aeration of the soil, providing optimum moisture retention for highly successful plant growth.