Production



Close up of Leca Lightweight Aggregate

LECA® is A CERAMIC LIGHTWEIGHT AGGREGATE PRODUCED BY EXPANDING SELECTED CLAYS IN A ROTARY KILN, AT TEMPERATURES OVER 1150°C.

Certain clays of particular composition expand when subjected to melting point temperatures due to the gasses released from within the clay compound.  

During the Leca® manufacturing process, the natural clay once treated and dried is passed through a rotary kiln and fired to a temperature of approximately 1150°C. This process expands the clay, fuses and melts to form pellets up to five times the clays original size. The resulting LECA® particle has a hard and resistant exterior skin and a cellular interior.
 

THESE ARE THE PRIME FEATURES THAT GIVE Leca® Lightweight Expanded Clay Aggregate THE OPTIMUM MIX OF LIGHTNESS AND RESISTANCE.

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The expanded clay pellets are then screened and sieved into their various fractions.

The production and raw material selection processes are strictly controlled to ensure a uniform, high quality product that is structurally strong, stable, durable and inert, but also lightweight and insulating.

Today Leca® Lightweight Expanded Clay Aggregate is used in masonry blocks, wall elements, premixed products for light and insulating screeds, lightweight geotechnical fills, roof and floor insulation, lightweight and fire resistant mortar and many other applications.

Leca® Lightweight Expanded Clay Aggregate products are produced to EN standards with a Declaration of Performance (DoP). Detailed information on product performance certificates specified by corresponding standards can be found in the Leca® Technical Documents area. For more information about Leca® LWA, please refer to our FAQ or contact us and speak to us directly.