cas no:1304-28-5 specification 1: appearance:gray to black block bao: 92% min baco3:1.5% max carbon(c): 4% sulfur(s):0.1% packed in plastic bag inside and iron pail outside with the net weight of 25kgs specification 2: appearance:gray to white granule bao: 88% min baco3:3% max chloride: 10ppm fe:30ppm moisture : 5% max packed in plastic bag inside and iron pail outside with the net weight of 25kgs.