ER Precision Optical has invested significantly in our crystal growing facilities. With four crystal pullers, we have more than enough capacity for high volume orders. While we specialize in optical grade Germanium and Silicon, we also offer semiconductor or electronic grade and solar grade silicon. Materials are available in full ingot form, generated blanks, or as finished product. We have a full metrology lab and offer Certificates of Conformance for all our material upon request to assure your specifications are met.