quartz; silica stone

non-metal, vitreous silica crucibles for melting a polycrystalline silicon material and forming silicon single crystal; non-metal, vitreous silica crucibles for melting a polycrystalline silicon material and forming polycrystalline silicon; all of the foregoing are non-laboratory equipment and non-furnace parts or apparatus

vitreous silica as a semi-finished product, namely, ingots, tubes, discs, plates, powder, beads, flakes and rings, all for general industrial and further manufacturing use in the electronic industry and the semiconductor industry