Expanded clay Aggregate (ECA ®) has a honeycombed structure and high percentage of void which results in the density of Expanded Clay Aggregate being considerably lower than that of traditional aggregates ( For e.g. in the case of aggregate size 8-15 mm and 15-30 mm, the dry density of the product is up to over 6 times lower).
P.S. Indicative dry density usually is calculated with ± 15% deviation as per EN 13055-1 European Standard. Please refer to the density chart page from the top menu to look at the specific weight of the product.