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  • Polyurethane
    Extremely wide variations in forms and in physical and mechanical properties are available in polyurethanes. Grades can range in density from 0.5 lb/ft3 in cellular form, to over 70 lb/ft3 in solid form, and in hardness from rigid solids at 85 Shore D to soft, elastomeric compounds. Polyurethane
  • Polyurethane Pultrusion Application Successes with Large Profiles
    Polyurethane resin technology for pultrusion was first introduced in the late 1990's as an option that promoted elimination of continuous strand mat due to the exceptional strength and toughness of the resin matrix. All-roving reinforced pultrusions using low pressure injection or low volume wet
  • Hungry for large parts? Try a composite sandwich
    , producing both an inner and outer skin. Reinforcement fibers are then attached to the inner surface of each skin. These formed skins are then transferred to a matched die mold, where they are held in place. When the die is closed, a cavity is created between the two surfaces. Polyurethane resin
  • Medical Device Link . Specialty Compounds for Medical Applications: An Introduction
    the information presented should be helpful in the production of any polymer-based device, the discussion is particularly geared toward compounds for catheters and other medical tubing products. Depending on the precise application, a typical starting resin might be PVC, thermoplastic polyurethane
  • Long-glass-fiber PP hits the road
    , and permits volume material purchases. Cost is another factor. PP has found a new home in many interior, exterior, and underhood applications at the expense of high-cost engineering resins such as ABS, polyurethane, and nylon. With improvements in catalysts and processes, PPs can compete
  • Medical Device Link . The Effects of High-Energy and EtO Sterilization on Thermoplastics
    ), and engineering thermoplastic polyurethane (ETPU). The resins listed in Table I were molded into standard ASTM Type 1 tensile bars (16.5 x 1.27 x 0.32 cm) and impact disks (5.08 cm diam x 0.32 cm thick). All resins were injection molded on the same machine using the manufacturer's recommended molding
  • Medical Device Link .
    desire in the medical industry for alternative plastic films that could be sealed with HF energy. Thermoplastic polyurethane (TPU) and ethylene-vinyl acetate (EVA) resins have increasingly been used to produce films that could be readily HF welded. Collection bag used to develop HF-weldable polyolefin
  • Medical Device Link . Environmental-Stress-Crack Resistance of Rigid Thermoplastic Polyurethanes
    . The effects of chemical exposure and heat-aging history on product functional performance and potential failure modes were also investigated. Two rigid polyurethane materials--designated RTPU-A and RTPU-B--were provided by a supplier. Table I lists selected physical properties of the two resins

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