Retention aids are designed to maintain a maximum of fine material and charges in the formation of paper. They thus confer improved properties to paper and guarantee a better machine productivity.

Polyaluminium chlorides such as Aqualenc or PLUSPAC are constituents of a number of retention systems.

The use of recycled pulp, which has become increasingly frequent over the years, brings more and more disturbing elements in the circuits. The addition of aluminium salts of type SAMO, Aqualenc or PLUSPAC can limit the negative effects of these contaminants on the efficiency of retention agents.

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