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Polycrystalline Silicon             

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 Polycrystalline Silicon is grown 99.9999%
pure in log form.  Purity is maintained after production by protecting the poly by having employees wear protective gear to keep skin, hair, etc. from getting into the poly.

The Polycrystalline logs are then processed into
various forms specific to market applications in clean rooms.

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 Various forms include chunks, chips, and cut rods used in the 
semiconductor and solar industries.