NEW CANNAN, CT - Unimin Specialty Minerals Inc., New Canaan, Connecticut, will raise prices for all MINEX, IMSIL, SNOBRITE and MINBLOC brand functional filler products effective February 1, 2017, unless contractual agreements apply. Price increases will range from 4% to 8% depending on grade. The increase is necessary to offset rising production costs, critical support and continual reinvestment.