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23 August 2010 Comparison of feedstocks for optical glass and optical plastic
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The raw materials for optical glasses and optical plastics are very different. The plastic feedstocks are volatile liquids, petrochemicals, which are highly refined by industrial distillation. The feedstocks for inorganic glasses are minerals, purified by solid processing methods. The optical plastic resin is always virgin stock; "regrind" is never used for high-quality optical plastics. In contrast, the inorganic optical glass feedstock is improved by adding "cullet", which is the recovered waste from breakage and trim during glass part production. This paper discusses the sources and refinement of feedstocks for both glass and plastic, including consideration of cost, recycle and ramifications for optical part production, and anticipated future trends. A snapshot summary of current marketplace conditions is given.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David Krevor "Comparison of feedstocks for optical glass and optical plastic", Proc. SPIE 7788, Polymer Optics Design, Fabrication, and Materials, 77880E (23 August 2010);

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