Fused Silica (Quartz) performs an awesome thermal expansion coefficient of 5.4 x 10-7/℃ , 6 time less than borosilicate glasses, harder enough to allow better figuring process and advantage in terms of strength to density ratio.
462 mm quartz blank
http://www.italiantelescopes.net/wp-content/uploads/2016/09/logo-italiantelescopes.png00Leonardo Priamihttp://www.italiantelescopes.net/wp-content/uploads/2016/09/logo-italiantelescopes.pngLeonardo Priami2019-09-06 11:17:122020-07-10 10:49:23462 mm QUARTZ Blank ready to be figured
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