SYMPOSIA PAPER Published: 01 January 2000

Evaluation of ABS Plastic Impact Verification Specimens


Valid comparison of impact test energies reported by various laboratories and over time depends on consistent performance of impact test machines. To learn what information verification specimens might reveal about the impact machines used to test plastics, and to learn the critical parameters that must be controlled to minimize the scatter in the data, we tested a batch of acrylonitrile-butadiene-styrene plastic (ABS plastic) specimens. Both Charpy and Izod sample configurations were tested. We concentrated on determining the variability in impact strength, but also studied the effects of room temperature aging, exposure to sunlight, and clamping pressure (for Izod testing) on the impact strength of the ABS plastic specimens. We conclude that: (l)the variability in impact strength for the ABS plastic impact specimens is comparable to metal specimens which are now used as verification specimens to test large capacity impact machines; (2) the ABS plastic specimens did not show significant signs of aging during our tests; and (3) clamping pressures will have to be specified for verification testing of ABS plastic Izod specimens.

Author Information

McCowan, CN
NIST, Boulder, CO
Vigliotti, DP
NIST, Boulder, CO
Siewert, TA
NIST, Boulder, CO
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Developed by Committee: E28
Pages: 210–219
DOI: 10.1520/STP14396S
ISBN-EB: 978-0-8031-5429-2
ISBN-13: 978-0-8031-2864-4