Two carriers will be built by HSHI on behalf of a European shipowner. The other four will be built by HHI, two on behalf of an Asian shipowner and two for a European shipowner.
Each vessel will have a capacity of 174,000 cubic metres (cbm).
GTT will design the tanks of the vessels, which will be fitted with the Mark III Flex membrane containment system.
The delivery of the vessels is planned between the second and the last quarters of 2023.
Philippe Berterottière, Chairman and CEO of GTT, said: ‘We are pleased to sign this new contract with the Hyundai Group shipyards, which once again confirms that the technologies developed by GTT meet the requirements of our customers thanks to their efficiency and safety.’