The new formulation of Beruform STE 426 has especially been tailored to the requirements of forming processes of zinc-plated belt material. Excellent results are achieved without leading to any disturbing white rust. By adjusting the product concentration it is possible to cover a wide range of process requirements. In addition, Beruform STE 426 is well suitable for sensitive aluminium and non-ferrous metal alloys. The product allows processing without discoloration or staining.