 KATY, Texas, March 30, 2021 PRNewswire -- U.S. Silica Holdings, Inc. NYSE: SLCA said today that its Industrial and Specialty Products segment will increase prices for its noncontracted diatomaceous earth, perlite, cellulose, silica and clay products used primarily in filtration, paints, coatings, elastomers, chemicals, glass, building products and other applications. The price increases, effective for shipments starting on May 1, 2021, will range up to 15 percent depending on the product and grade. 