 U.S. Silica Holdings Inc. SLCA, 1.14 said Tuesday its Industrial and Specialty Products business will raise prices by 9 to 20 beginning Nov. 1, to help offset significant and continuing cost increases in labor, transportation, materials and manufacturing. The performance materials company said the price increases will be for most of its silica sand, aplite, limestone, diatomaceous earth, perlite, engineered clays and non-activated clay products, for various uses including glass, filtration, foundry, paints, coatings, roofing and building products. 