ALUMINIUM ALLOYS SUITABLE FOR LITHOGRAPHIC PRINTING PLATES

摘要

Aluminium alloys are described which after suitable processing can be used to produce lithographic printing plates of improved stoving resistance. The alloys consist essentially of at least 99.00 % by weight of aluminium, from 0.02 to 0.15 % by weight in total of zirconium and/or hafnium and from 0.05 to 0.25 % by weight of manganese, with the remainder being incidental impurities. Improved stoving resistance is particularly shown with 0.02 to 0.08 % zirconium and from 0.05 to 0.15 % manganese, especially when stoving takes place at 240 DEG C or above.