Abstract
A machine for measuring the coefficient of friction between a flat sheet of polymeric material and a ground steel plate is described in detail. An inverted lathe cross slide forms the basis of the drive mechanism. Frictional force is balanced against the tension developed in a spring (proof ring), the extension of which, measured with a commercial displacement pick-up, gives a direct reading of coefficient of friction. A few results are given for a PVC sample plasticized with 40% di-octyl phthalate. A circuit for automatic operation and recording is also described.

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