Evaluation of five fluorinated compounds as calcarenite protectives

Ten fluorinated compounds were selected from the Dupont catalogue in order to evaluate their possible use as protection of calcarenite surfaces. Five of them were selected on the basis of their behaviour as regards the static contact angle test. In order to achieve a deeper insight on the chemical composition of the surface, these five compounds were analysed by time of flight secondary ion mass spectrometry (ToF-SIMS) and by X-ray photoelectron spectroscopy (XPS), before and after ageing in a climatic chamber simulating exposure to solar radiation. Finally the efficiency of these five products, as protectives of calcarenite surfaces, was evaluated by capillarity water absorption test. The behaviour of these compounds in relation to the attack of algae was also evaluated.