Organic colors are particular sensitive to quality deterioration caused by thermal and/or photo-oxidative decay. Bleaching and/or yellowing of the colorant or the binding agent are common indicators of such undesirable decay.

Additional treatment with antioxidants, UV absorbers, HALS etc. are used to prevent oxidative decay caused by external factors such temperature, light exposure, humidity etc. These treatments are crucial to ensure the requested service lifetime of polymers, in particular for long-term application and extreme conditions (outdoor applications, motors, isolation of cables). The technology of ACL Instruments allows a very precise characterization of the efficiency of such stabilizing treatments, especially since the application conditions can be very closely simulated. This permits optimization in regard to both the composition and quantity of stabilizing system used. The specific life expectancy of individual product formulations under given application conditions can be accurately predicted using isoconversional analysis of the oxidative kinetics.

Oxidation of stabilised coating in air depending on the ageing with Xenon arc instrument (0, 12, 24 und 36h): the longer the ageing procedure, the earlier sets the oxidation of the sample. Measurement conditions: each in non-isothermal (dynamic) temperature profile from 25 to 200°C, heating rate = 0.12 Kmin-1, gasflow = 30 mlmin-1.
aged coating

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