SubheadingDescriptionGeneralSpecialOther
6902.10 Containing by weight, singly or together, more than 50 percent of the elements magnesium, calcium or chromium, expressed as MgO, CaO or Cr2O3:
6902.20 Containing by weight more than 50 percent of alumina (Al2O3), of silica (SiO2) or of a mixture or compound of these products:
6902.90 Other: