In this type of block or concrete, it is used a variety of lightweight materials to lower the density. These are sometimes extracted from nature, sometimes produced industrially. One of the most important lightweights is natural pumice, its mineral resources are found all over the country, and another natural material is the pumice and the best pumice is in Tabriz. Lightweight industrial materials include leca, perlite and polystyrene beads, which are used in the production of various lightweight blocks.

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