21 Articles made from fused quartz glass and quartz glass fibers, namely, tubes, poles, plates, blocks, pipes, bars, rods, ingots, rings, preforms, not for textile use; Fused silica as a semi-finished products, other than for construction, namely, tubes, poles, plates, blocks, pipes, bars, rods, ingots, rings, preforms, all for general industrial and further manufacturing use; Doped fused silica as a semi-finished products, other than for construction, namely, tubes, poles, plates, blocks, pipes, bars, rods, ingots, rings, preforms, all for general industrial and further manufacturing use; Articles made from fused opaque silica, namely, tubes, poles, plates, blocks, pipes, bars, rods, ingots, rings, preforms, all for general industrial and further manufacturing use; Articles made from fused black silica, namely, tubes, poles, plates, blocks, pipes, bars, rods, ingots, rings, preforms, all for general industrial and further manufacturing use