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Field trial in ice-covered sea is one of the most important tasks in the design of icebreaking ships. To correctly estimate ice load andice resistance on ship's hull, It is essential to understand the material properties of sea ice during ice field trials and to perform theproper experimental procedure by gathering sea ice data. A measurement of sea ice properties was conducted during February andMarch of 2012 with the Korean Icebreaking research vessel "ARAON" in the Amundsen Sea, Antarctica. This paper describes a testprocedure to obtain sea ice data which provide basic information to estimate ice loads and icebreaking performance of the ship. Thedata gathered from sea ice field trials during the 2012 Antarctic voyage of the ARAON includes ice temperature/salinity/density and thecompressive/flexural strength of sea ice. This paper analyses the gathered Antarctic sea ice material properties comparing with theprevious data obtained during ARAON’s Arctic and Antarctic voyages in 2010.