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Digboi Refinery has crude processing capacity of 0.65 MMTPA. It processes waxy crude extracted from oil fields operating in area nearby Digboi. It has also started processing of Crude condensate in 2018. Digboi Refinery was modernized with commissioning of new CDU, DCU, CRU towards end of 1990s. In early years of 21st century, new units SDU, WHFU, HDTU, HGU, SRU and Captive Power Plant were commissioned. Later on, Digboi Refinery commissioned MSQU units NHT and ISOM units in 2010. The refinery also has Wax Moulding unit and Wax Pelletisation unit for production of finished Wax in Slab and Pellet form respectively. It has also installed and commissioned a CRMB+ unit in 2018 for production of Crumb Rubber Modified Bitumen using IOCL-R&D developed technology.