Say caustic soda (ya tatawagen met ya sodium hydroxide) et sakey a mausa-usar tan malaknab ya uusaren ya kemikal ed industriya ya uusaren ed nanduruman industriya kaiba lay tela, pulp tan papel, alumina, sabon tan detergent, panagpino na petrolyo tan panaglinis na danum. Kaslakan ya ilalako iya ed duaran pisikal a kipapasen: likido (alkali) tan solido (flakes). Saray caustic soda flakes et mas mainomay ya iyakar ed arawin pasen tan mas labay ya i-export. Say kompanya so komaduan sankabalgan ya managgaway caustic soda ed India ya walay kapasidad ton 1 milyon a tonelada ed tinaon.