The high purity quartz products, used our own mine, high quality nature crystal as the raw material, go thru advanced technic. Typical Trance Element Compositions (PPM by weight): TypeAlFeCaMgTiMnBKNaLiOHA150.210.5<0.10.8<0.050.080.60.80.7<120B150.210.5<0.10.8<0.050.080.60.80.7<10C150.210.5<0.10.8<0.050.080.60.80.7<5Standard Size & Tolerance (Tube) : Size(mm)OD(mm)W.t.(mm)Length(mm)Siding MaxBow ...