TECHNICAL DATA SHEET XTRACON PR Polyurethane Process and Recovery Concentrates        Xtracon PR series are concentrates for use in thermoplastic polyurethane or polyurethane alloy applications where improved melt strength and flow characteristics are required. The PR series are particularly useful as processing aids with virgin resin in blown and cast film as well as for profile extrusion applications.        The use of Xtracon PR has also been effective in re-polymerizing regrind and or low molecular weight polyurethane thermoplastics where significant improvements in both processing parameters and physical properties have been shown. The degree of recovery will vary with the amount used and mixing efficiency but levels of 1-10 pphr* have been proven to be effective in a number of different systems. * pphr is parts per 100 parts of resin The Series Consists of Five Grades with the Following Base Resins Xtracon PR-100 Polyester Urethane Xtracon PR-200 Polyether Urethane Xtracon PR-300 Ether/Ester Urethane Xtracon PR-400 Aliphatic Polyether Urethane Xtracon PR-500 Rigid Urethane Appearance 1/8” x 1/8” Pellets Color Natural Melt Flow Index, 195°C 8.7 Kg. Load 10 Min., Gms. 75 - 250 Water Content ( % ) 0.03 Sp. Gr. 1.10 - 1.25        XTRACON PR Series should be stored in a cool dry place and care should be taken to re-seal containers carefully that have been opened to avoid contamination by atmospheric moisture.        XTRACON PR Series are not considered to be hazardous under SARA TITLE III. Safe industrial handling and hygiene practices are always highly recommended. Polyurethanes and other plastics produced with this product my present a fire hazard in certain applications if exposed to fire and/or excessive heat, e.g. welding and cutting torches in the presence of oxygen or air. Refer to MSDS for more information.        XTRACON PR Series are packaged in 50, 100, 200, 500, and 1000 lb. net fiber-packs or Gaylords. Smaller packages of 1, 5 and 10 lbs. are available on request.        Processing for extrusion requires a minimum melt temperature of 340°F to fully initiate the beneficial effects of Xtracon PR product series. Typical processing profile temperatures can range from 340°F to 450°F and will depend on the optimum recommended temperatures of the base resin.        In general terms, it is recommended to start the extruder slightly hotter than normal and then cool the die to a level lower than is normally used. This may assist in bubble or tube control, however the Xtracon PR should provide for a wide latitude of temperature variation and still maintain bubble or profile integrity.        Note: With certain types of TPU, at temperatures >450°F, a slightly fishy or very mild amine odor has been noticed by operators. This phenomenon is does not occur in all TPU materials and is undetectable in all of the finished urethane films or articles. The material responsible for this odor has not been identified nor has any potential health hazard been determined. The facts stated and recommendations made herein are based on our research and research of others, and are believed to be accurate. No guarantee of their accuracy is made, however, and the product discussed is recommended without warranty on our part, express or implied, and upon conditions that recipients shall make their own test to determine its suitability for their purposes. Likewise, statements concerning the possible uses of the product are not intended as recommendations to use it in the infringement of any patent.