ISI MARK CERTIFICATION FOR CAUSTIC SODA Caustic Soda is mainly used in the manufacturing of soap and detergents, pulp and paper, alumina, petroleum products and chemical production. Ministry of Chemicals and Fertilizers has noticed an Indian Standard IS 252: 2013 for Caustic Soda and it is mandatory to be tested and certified under the BIS. Aleph INDIA QMS with its branches Aleph Accreditation and Testing Centre and Aleph Industrial Corporation serves the manufacturers of chemicals to get their ISI Mark with its best product certification services.