Anti dumping duty imposed on caustic soda imports to address dumping and material injury, with specified calculation rules. Imposition of a final anti-dumping duty on Sodium Hydroxide imported from the Republic of Korea and the People's Republic of China, based on DA findings of dumping and material injury to the domestic industry. The government prescribed duties by reference to tariff headings, product specifications, countries, producers and exporters, calculated as the difference between specified benchmark amounts and the landed value, payable in Indian currency, effective from the provisional duty date, with defined rules for landed value and exchange rate determination.