The thermo-oxidation resistance and weatherability of' LDPE and HDPE compositions, containing up to 45 wt. $6 calcium carbanate, are investigated. The thermo-oxidation resistance is inrestigated by dynamic D'FA and natural ageing is carried out in an exposure station in a seaside climate. The change in strength and colour after ageing is determined. The behauiours of filled and unfilled polymers are compared. Empirical equations are given, describing the change in the investigated parameters during natural ageing .
A base of experimental data on the ageing of commerial grade plastics is created. In includes assorted physical and chemical properties of plastics and their changes at natural ageing. An automated system for storing and processing of the experimental data is designed. Processing involves mathematical modeling of the changes in properties that aids in empirical prediction. The possibilities of the system are verified with experimental results from a 5‐year ageing period of PE‐LD and PE‐HD. The results show a good agreement between the predicted and real data for selected models.
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