Sheet metal must have good forming properties. Typical forming processes, such as deep drawing and stretch forming are regulated by standard testing methods. Zwick's BUP sheet metal testing machines test these properties with drawing forces up to 1,000 kN. Another important but complex test is the determination of the forming limit curve, from which engineers can derive limit strains which should not be exceeded during forming processes. Zwick works in close collaboration with highly specialized partners to develop the optical measurement technology required for recording strains during the drawing process.