Non-metallic building materials
Main processes: sorting (for sand and gravel rocks); crushing and sorting (for production of crushed stone, rubble stone and crushed sand); Classification (receiving fractionated sand); flushing of crushed stone, gravel and sand, or sometimes their dry cleaning; sawing, edging, grinding and polishing when facing plates from blocks-billet; drying and shredding when a mineral powder. Technical requirements, governed primarily by grain composition, content of flour, as well as the weak, strength, frost resistance, sometimes the shape of the grains, the nature of the rocks, the content of harmful impurities; a wall of stone and tiles are regulated by their linear dimensions and tolerances for linear dimensions, as well as the nature of the surface texture. Also art. Quarry stone, sand, Gravel, crushed stone, a piece of stone.