2830 Sulphides, polysulphides, whether or not chemically defined

2830 (01/1988-..) Sulphides, polysulphides, whether or not chemically defined 28301000 (01/1988-..) Sodium sulphides 28302000 (01/1988-12/2006) Zinc sulphide 28303000 (01/1988-12/2006) Cadmium sulphide 28309011 (01/1988-..) Sulphides of calcium, of antimony and of iron 28309019 (01/1988-12/1997) Sulphides (excl. sodium, zinc, cadmium, calcium, antimony and iron) 28309080 (01/1998-12/2006) Sulphides, polysulphides, whether or not chemically defined (excl. sulphides of sodium, zinc, cadmium, calcium, antimony or of iron) 28309085 (01/2012-..) Sulphides, polysulphides, whether or not chemically defined (excl. sulphides of sodium, calcium, antimony or of iron, and inorganic or organic compounds of mercury) 28309090 (01/1988-12/1997) Polysulphides