Glass substrates can be made from float glass,Borofloat glass,borosilicate glass,fused silica,quartz glass substrate and etc. This drilled glass can be used as micro fluidics application,flow control,microscope slide,glass coverslips and more. Glass substrate has outstanding features: 1.harmless to both humans and environment 2.recyclable 3.high thermal resistance 4. high chemical resistance 5. excellent transparency Glass substrates can be custom made from the diameter,the size,the shape and even drilled holes.We are especially capable of thin thickness and tight tolerance. Only if you have drawings and specification, we can supply you all you need. â??