9 Products made of quartz glass for use in the chemical industry, in the electronic industry, in the semiconductor industry and for laboratory use, namely, optical lenses, prisms, plates, optical filters, mirrors, mirror plates; wave guides and optical fibers; quartz glass, translucent fused quartz and semi-finished products made from these materials, namely, optical tubes, rods, plates, blocks for laboratory, optical and industrial use; semi-finished products made of quartz glass for manufacturing of optical fibers, namely, tubes, rods, preforms, handles