A fully automatic and integrated plant, incorporating stringent pollution control equipment has been set up by HEI for the manufacture of Cyanides. More than 40% of Sodium Cyanide & Diphenyl Guanidine output is exported. Products are used in gold/silver refining, heat treatment, electroplating, pharmaceuticals, tyres, foam and rubber. Natural Gas is the main raw material. The plant has an in-house R&D Centre recognized by the Department of Scientific and Industrial Research, Government of India.