21 Unworked and semi-worked glass with the exception of glass used in building, namely unworked and semi-worked glass-ceramic and special glass, not for building, in the form flat glass, hollow glass, glass tubes, glass rods, glass fibres, glass powder, glass granulate and sintered glass used the manufacture of products in optical, optoelectronic, electrotechnical, electronic, electrical, chemical, physical, biological, agricultural, pharmaceutical, cosmetic, medical, scientific, technical, precision engineering, aesthetic, household, kitchen industries; unworked and semi-worked glass for kitchen appliances, namely cookers, baking ovens, refrigerators, freezers, microwave ovens, food processors, coffee machines, cooking and water heating apparatus, for fireplaces, for hermetic sealing of display housings, diodes, ceramic housings for integrated circuits, for the passivation of semi-conductors, for soldering glass to glass, glass to ceramics or glass to metal; substrates and bases of sintered glass ceramic, glass solder, granulate, powder and sintered preforms for electronic components; primary packaging made of special glass for the pharmaceutical and cosmetic industries, namely flasks, ampoules, syringe bodies, glass vials for medication sold empty, glass ampoules for medication sold empty, bottles sold empty.