 KATY, Texas, July 19, 2021 PRNewswire -- U.S. Silica Holdings, Inc. NYSE: SLCA announced today that its Industrial and Specialty Products business will increase prices for most of its non-contracted silica sand, diatomaceous earth and clay products used primarily in glass, foundry, paints, coatings, elastomers, roofing, chemicals, recreation, building products, agricultural, pet litter and other applications. Price increases will range up to 15 percent, depending on the product and grade, and go into effect for shipments beginning September 1, 2021. 