ICS Industriechemikalien Schwefelnatrium GmbH is a traditional producer of sodium sulfide at the location Bitterfeld-Wolfen in Saxony-Anhalt since 1916. Since the privatization in 1996 EUR 6 million euros were invested in the modernization of the production plant.

The product range includes now in addition to sodium sulfide also sodium hydrogensulfide (NaHS) and Disodium tetrasulfide (Na2S4).