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| Keywords: LeatherResearch 008.jpg The flexing resistance of shoe upper leather is evaluated at NBS by means of the NBS leather flexer The specimen in the form of a thin strip is bent around two small pins or rollers within the reciprocating assembly at the center of the device Weighted cables passing over pulleys at each end of the machine keep he specimen under tension through movable clamps The reciprocating action repeatedly bends the specimen around the small rollers and the flexing endurance of the specimen is determined from the number of flexes before failure National Institute of Standards and Technology 1953-01-01 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology Leather Leather shoes | ||||
