n (ring-and-ball test) A method of determining the softening temperature of resins (see www.astm.org). A specimen is cast or molded in a metal ring of 16-mm inside diameter and 6.4-mm depth. This ring is placed upon a metal plate in a liquid bath heating at a controlled range, and a steel ball 9.5 mm in diameter weighting 3.5 g is placed in the center of the specimen. The softening point is considered to be the temperature of the liquid when the ball penetrates the specimen and touches the lower plate.
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Gooch, J.W. (2011). Bale-and-Ring Test. In: Gooch, J.W. (eds) Encyclopedic Dictionary of Polymers. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6247-8_1016
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