Scanning Calorimeter (DSC) Analysis for the Determination of the Effectiveness of Antioxidants is generally contained in Polyethylene Tubes, Films and Fittings with Measurement of Oduction Time (OIT) under Isotermic Conditions at 200 ° C in Oxygen, as according to UNI EN 728 and ISO 11357-6 standards.
Under the isothermal mode (OIT test), the materials are first heated in an inert atmosphere for N2, then kept at constant temperature for a few minutes until the thermal equilibrium is reached, and then purged with oxygen or air atmosphere. The time between the first contact with oxygen ( or air) and the onset of oxidation is called Oxidation Induction Time (OIT).