Enhanced resistance to wear and corrosion with new barrel inlay

29-Jul-14

A bimetallic barrel alloy with enhanced resistance to corrosive and abrasive wear extends the working life of extrusion and injection molding barrels in general-purpose applications and provides greater assurance of product quality and consistency, it was announced today by Nordson Xaloy Europe. The key to the corrosion resistance of the X220™ alloy is its higher chromium content relative to other barrel inlays for general-purpose use—double the chromium content of Nordson Xaloy’s own X200™ inlay and greater than the standard alloy in Europe. The new inlay also exhibits greater hardness: 64 to 69 on the Rockwell HRC scale, as against 58 to 65 for the X200. In acid immersion tests of sample weight loss, X220 alloy exhibited a 55% improvement over other European alloys in sulfuric acid and a 44% improvement in hydrochloric acid “The new X220 inlay improves productivity and product quality through better screw-to-barrel fit, reduces downtime, and prolongs the working life of the barrel,” said David Hotchkiss, global product manager. A bimetallic inlay is a high-hardness alloy that lines the inner wall of the barrel. As general-purpose inlays, the iron-based X200 and the iron-chromium-based X220 can be used with a wide range of polyolefin, styrenic, and other resins at filler loadings up to 15%. For vinyls, certain fluoropolymers, and other potentially corrosive resins, Nordson Xaloy supplies the X306® nickel-cobalt alloy. The tungsten carbide / nickel-based alloy X800® provides exceptional wear and corrosion resistance for highly filled resins and high-temperature engineering polymers.