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What is Light Expanded Clay Aggregate (ECA®) and how is it made?

What is Light Expanded Clay Aggregate (ECA®) and how is it made?

Light Expanded Clay Aggregate (OR ECA®) is a type of lightweight, porous ceramic material that is made by heating clay to high temperatures in a rotary kiln. This process causes the clay to expand, much like popcorn, creating a lightweight, porous material that's often used in construction and horticulture.