Importance of Drying > Fabrication Process > Purging & Using Regrinds > Finishing Purging   Both before and after CALIBRE* polycarbonate resins are processed, the fabricating equipment must be thoroughly purged. One of the most common methods of purging is to use general purpose polystyrene. Other plastics such as acrylic resins or high density polyethylene can also be used. Using Regrinds   Trim or scrap materials that result form the fabrication of CALIBRE polycarbonate resins can be reground and reused if care is taken to avoid contamination and moisture pickup. Regrinds can generally be used with virgin material in proportions of a 25:75 ration with a minimal loss of physical properties or color shifts. Since particle sizes of regrinds are larger and irregular, longer drying times from five to six hours are recommended. "*" Trademark of the Dow Chemical Company, licensed for use by LG DOW Polycarbonate LTD.

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