A process for working superplastic sheet material comprising shaping the superplastic alloy by pressure or vacuum forming, annealing the sheet material before or after the pressure of vacuum forming, and bending at least a part of the shaped sheet at room temperature. In a preferred procedure rolled superplastic zinc/aluminium alloy sheet material is annealed at about 200* C for at least one hour, vacuum or pressure forming carried out at 200* C to 250* C after the annealing, and the shaped sheet allowed to cool to room temperature before bending.