ISO 178 determines flexural properties of reinforced and unreinforced plastics including high modulus composites and insulating materials for electronics using a three point loading system. The specimen tested are thin rectangular bars either from sheets, plates or molded shapes and the test data results in flexural properties including max fiber stress, flexural yield, flexural strength, max strain, modulus of elasticity and stress as a function of strain which are important for qualitative characterization, research and development, quality control and other plastics engineering design purposes. ISO 178 Procedure A uses a strain rate of 1%/min and is for specimen that fail under relatively small deflections. ISO 178 Procedure B uses two different strain rates, 5%/min or 50%/min depending on the material