Determines fabric stiffness using the astm circular bend test method. A plunger of 25.4mm (1 in) diameter pushes the fabric through a 38mm (1.5 in) diameter orifice for a distance of 57mm (2.25in) in 1.7 seconds and the maximum force is recorded. Provided with pneumatic vylinder, control and batteroperated digital force guage 50kgf/500N/50lb (switchable) with peak-hold facility. Laboratory compressed air supply required.