Caustic soda (izwi kandi kw’izina rya sodium hydroxide) ni umuti ukoreshwa cane kandi ukoreshwa cane mu nganda zitandukanye harimwo ivy’impuzu, ivy’impuzu n’ivy’impapuro, ivy’i alumina, isabune n’ivy’isuku, ivy’ugusukura amavuta y’ibitoro n’ivy’ugusukura amazi. Ubusanzwe igurishwa mu buryo bubiri: amazi (alkali) n’ikomeye (flakes). Ivyo bipande vya soda vyoroshe gutwara mu nzira ndende kandi ni vyo bikundwa cane mu gutwara hanze. Iyo sosiyete ni yo igira kabiri mu guhingura soda y’umuriro mu Buhindi, ikaba ishobora gukora amatoni miliyoni imwe ku mwaka.