Tuff - rock, volcanic emissions of a product made by the flow from the bowels of the earth, from the loose erupted material- volcanic ash that accumulated on its surface, Speck, sealed, gradually forming powerful deposits. With adjacent tuffs sometimes pumice - stone foam, go upstairs in the solidification of lava overflowing gases. Tuff porous structure expressed by centuries of contact with the water at high altitudes. Porosity hygroscopicity tuff significantly improves its sound insulating properties and increases the water resistance and insulation. Tuf is stronger than the bricks, as well as for a better water resistance.
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