quartz sheet (plate, target, flake, slice, tiles) Used for optical and vacuum instruments and light source. The size as follows: 1. Square type 100mmx100mmx(thickness 1mm-30mm) 150mmx150mmx(thickness 1mm-30mm) 200mmx200mmx(thickness 1mm-30mm) 200mmx400mmx(thickness 1mm-30mm) 300mmx300mmx(thickness 1mm-30mm) 400mmx400mmx(thickness 1mm-30mm) Other size will according to the customer detail require to produce . 2. Circular shape Diameter 50mmx (thickness 1mm-5mm ) Diameter 100mmx(thickness 1mm-5mm ) Diameter 150mmx(thickness 1mm-5mm ) Diameter 198mmx(thickness 1mm-5mm ) Other size will according to the customer detail require to produce SiO2: 99.98% - 99.99%The UV transmission percentage around 80%-95% at 253.7 nanometers. If you want to check more detail and connect with us, please check our website and add us by MSN or SKYPE . Then we can talk more detail on line.