Determination of Brittle Point of Rubber Materials in Cold Air

Abstract

The method described herein for determining brittle point is relatively simple, and the results are indicative of the ability of the material to withstand impact combined with bending. It is believed that this combination will more correctly evaluate brittle point than a bent loop test or other moderate flexing tests. If the material is exposed to low ambient air temperatures in service, then tests to determine brittle point should be made in cold air and not in an immersion bath. Appreciable differences in brittle point are obtained by judicious modifications in compounding ingredients of Buna-N and chloroprene synthetic rubbers.

Accelerated and Outdoor Weathering of Colored Vinyl Films

“…Two spray heads are located in such a manner as to impinge on the specimen holders on the upper and lower racks. The racks are constructed to support the sample holders at an angle following recommendations of Chatten (6), so that the light from the arc is nearly perpendicular to the specimens.…”