The Plastics Group of America — a materials firm based in Woonsocket, R.I. — has added water-safe polypropylene compounds to its lineup. The new materials — sold under TPG’s Polifil trade name — are based on homopolymer PP and are reinforced with chemically-coupled glass fibers. They also have NSF/ANSI certifications from NSF International and the American National Standards Institute. These PP compounds have been expanded to include a wider range of glass, and now are available in white, black and natural shades, TPG officials said in a recent news release. “Expanding our offerings…naturally increases our appeal to manufacturers,” Mike Rosenthal,...