| http://www.w3.org/ns/prov#value | - As a glass for precision press-molding, the glass has a remarkably low glass transition temperature, so that the preform can be press-molded in a temperature range below and including 400??? C. Further, not only a press mold generally used in precision press-molding such as a mold formed of SiC or an ultra-hard alloy can be naturally used, but also a press mold formed of stainless steel can be use
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