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Lightweight expanded clay aggregate (LECA) or expanded clay (exclay) is a light weight aggregate made by heating clay to around 1,200 °C (2,190 °F) in a rotary kiln. The yielding gases expand the clay by thousands of small bubbles forming during heating producing a honeycomb structure. LECA has an approximately round or potato shape due to circular movement in the kiln.
Leca® is the world leader in horticultural, agricultural & hydroponic substrates. The benefits of Leca are :
Manufactured to relevant ISO standards, Leca® is consistent in nature: