- FeS - M = 87,92 g/mol - CAS [1317-37-9] - EINECS-No.: 215-268-6 - Solub. in water: (20 ºC): almost insoluble - Melting point: ~ 1195 ºC - Tariff number: 2830 90 11 00 SPECIFICATIONS sulphide content: approx. 29 %