Optical glassware, in the form of discs or of plates, all made of fused silica or of glass; products made of quartz glass for use in the chemical industry, the electrical industry, the semiconductor industry and for laboratory purposes, particularly pipes, tubes, bars, rods, plates, blocks, ingots, rings, sleeves and quartz wool; optical lenses, optical glass, mirrors, optical prisms, particularly as part of or accessories to lasers, microscopes, instruments for physics and semi-finished goods thereof; semi-finished product for fiber optic cables, especially preforms, cores rods for fiber optic cables, cladding tubes and hollow cylinders for fiber optic cables; end caps for optical fibers; tubes for the manufacturing of optical fiber core rods

Quartz glass and quartz glass fibers (vitreous silica fibers, not for textile use); Fused silica (semi-worked products, other than for building), and semi-worked products made therefrom, in particular pipes, tubes, bars, rods, plates, blocks, ingots, rings, preforms, sleeves; Doped fused silica (semi-worked products, other than for building), and semi-worked products made therefrom, in particular pipes, tubes, bars, rods, plates, blocks, ingots, rings, preforms, sleeves; Translucent fused silica (semi-finished product, except for construction purposes), and semi-worked products made therefrom, in particular pipes, tubes, bars, rods, plates, blocks, ingots, rings, preforms, sleeves; white opaque and black opaque fused silica (semi-worked products, other than for building), and semi-worked products made therefrom, in particular pipes, tubes, bars, rods, plates, blocks, ingots, rings, preforms, sleeves; synthetic quartz glass (semi-finished product, except for construction purposes), and semi-worked products made therefrom, in particular pipes, tubes, bars, rods, plates, blocks, ingots, rings, preforms, sleeves; synthetic opaque quartz glass (semi-finished product, except for construction purposes), and semi-worked products made therefrom, in particular pipes, tubes, bars, rods, plates, blocks, ingots, rings, preforms, sleeves; synthetic quartz glass fibers, not for textile purposes; synthetic quartz for optical fibers; synthetic fused silica for optical fibers; vitreous silica fibers, other than for textile use; products made of quartz glass for use in the chemical industry, the electrical industry and the semiconductor industry, namely, pipes, tubes, bars, rods, plates, blocks, ingots, rings, sleeves