WSR are aqueous solutions of cationic polyamidoamine resins with epichlorohydrin suitable for providing wet strength to paper and carboard, with different concentrations with a low AOX and 1,3 dicloro-2- propanol content in compliance with current regulations (Council Directive 88/379/EEC et seq.), which allow waste sheets to be recycled in the pulper and processing according to the EU Ecolabel.