21 Quartz glass pipes being glass pipes, not for building and not for scientific purposes; fused silica, semi-worked, for use in manufacture, namely, fused silica as a semi-finished product, namely, ingots, tubes, rods, discs, plates and rings all for general industrial and further manufacturing use; fused silica being a semi-worked product, other than for building, namely, fused silica as a semi-finished product, namely, ingots, tubes, rods, discs, plates and rings all for general industrial and further manufacturing use; glass, unworked or semi-worked, except building glass; unworked or semi-worked glass, except building glass; crystallized glasses, namely, drinking glasses; glasses being insulating jars; fiberglass thread, other than for textile use; glass fibers for reinforcing plastics; vitreous silica fibers, other than for textile use; glass fibers for use in manufacturing various industrial products and consumer products being glass fibers for non-textile purposes; fused silica being a semi-worked product for manufacturing process of semiconductors and liquid crystals, namely, fused silica as a semi-finished product, namely, ingots, tubes, rods, discs, plates and rings all for general industrial and further manufacturing use; fiberglass, other than for insulation or textile use