Engineered plastics are often called upon to add durability in pumps used with harsh fluids at elevated temperatures. Liquid Metronics Inc (LMI) followed this route when it chose Fortron ( R) polyphenylene sulphide, a linear PPS, to prevent cracking and creep in key elements of its electromagnetic chemical metering pumps, which handle corrosive substances. Manufactured by Fortron Industries and sold by Ticona, Fortron PPS has broad application in high-performance pumps because of its excellent mechanical and other properties, even at temperatures well above 200 o C. Kevin Moran and Paul Lake (Liquid Metronics Inc) and John Dole (Ticona) provide the details.