Excerpt from Study of the "H" Test: For Evaluating the Adhesive Properties of Tire Cord in Natural and Gr-S Rubbers
There were, also, in use by certain of the tire manufacturing and related firms, methods for the measurement of adhesion of tire c rd to rubber. One such method, in use by The B. F. Goodrich Company6 was said to give excellent evaluation of adhesion in rayon tire cords. This method employs cylinders ofr ber'0.7 inch in diameter and one inch long, as described by Lessig_. For the Goodrich flexometer, except that a section of the test cord passes diametrically through the center of the cylinder. Adhesion is measured by applying pressure to the ends of the cylinder at right angles to the cord axis, until the bond between.the rubber and cord is broken, and noting the force required. The force measured is not the actual shearing force required to break the adhesive bond, but rather a functionally related compressive force.
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