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  • Polystyrene
    (SMA) copolymers. Structural characteristics of these resins are similar, but the SMA resins have the highest heat resistance. Expandable polystyrene (EPS) is a specialized form of the resin used to make lowdensity (0.75 to 10.0 lb/ft) foam shapes and blocks. These materials are suited for thermal
  • The Effect of Process Characteristics on Metal Fill and Defect Formation in Aluminum Lost Foam castings
    The process used to make the foam patterns generally involves two steps. The first step is pre-expansion in which the raw polystyrene beads are expanded to the desired bulk density. The expansion is accomplished by either heating the beads in vacuum, or by applying steam to obtain the desired

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