How is it possible to prove poor resistance to condensation in aqueous coatings?
Due to the poor wetting behaviour of water, wetting agents are often used when dispersing aluminium pigments in aqueous coating systems. These lead, to varying degrees, to a deterioration in the humidity resistance. Exchanging certain tensides for others can result in a considerable improvement. Additives are used with some stabilised aluminium pigments in order to suppress the development of gas. These additives also lead to a reduction in the resistance to condensation. In such cases, the use of either encapsulated aluminium pigments (Stapa Hydrolux, Stapa Hydrolan) or aluminium pigments stabilized with a smaller amount of additives is recommended.
