... meth. ZCQ supply our clients with various dimensioned clear Sio2 Ring among our Sio2 products which are widely used in vacuum ... )PURITY: Containing SIO2 from 99.95%-99.9999% USUAL SIO2 RING DIMENSION:1.OD300×ID230×T7MM,8MM OR 15MM2.OD335×ID265 ... -designed dimensions OTHER SIO2 CATEGORY: Grain, Wafer, Disc, Panel, Plate, Ring, Block, Sand, Rod CHARACTERISTICS: High Pure; Low Air Bubble Density ...