 U.S. Silica Holdings Inc. SLCA, 2.46 said Tuesday its industrial and specialty products business will raise prices on most of its non-contracted silica sand, aplite, diatomaceous earth and clay products used primarily in glass, foundry, paints, coatings, elastomers, roofing, chemicals, recreation, building products, agricultural, pet litter and other applications by 6 to 14 starting Feb. 1, 2022. These price increases are necessary to help offset significant and continuing cost increases in energy, labor, transportation, materials and manufacturing costs, the company said in a statement. 