This paper outlines the testing of SU-8 structures subjected to high deformations in bending. Six 'dog-bone' test structures were fabricated with flexible sections comprising of variations of 25 mum thick beams, and tested using a novel method to bend the structures through very small radii. A simple mathematical model is outlined that accurately predicts this performance. The structures underwent stresses of up to 191MPa, some showing signs of plastic yield at very high deformations.