At their June meeting in Norfolk, Va., the ASTM Time and Temperature-Dependent Physical Properties Subcommittee D11.14 voted to withdraw a previously proposed rebound resilience method which had been under development for two years.

The proposed method was being designed to replace ASTM D 2632 (’96), Standard Test Method for Rubber Property-Resilience by Vertical Rebound, and ASTM D 1054 (’91), Standard Test Method for Rubber Property-Resilience Using a Rebound Pendulum. Essential elements of ISO 4662 (’86), Rubber–Determination of Rebound Resilience of Vulcanizates, and DIN 53 512 (’88), Determination of Rebound Resilience of Rubber, were also being incorporated into the new method, said Michael Kent Warner, a member of ASTM Committee D11 on Rubber.

When development of the new method was withdrawn at the June meeting, it was decided that D 2632 and D 1054 would remain stand-alone methods, according to Warner, who is manager of Special Projects, CCSi, Inc., Akron, Ohio, and chairman of ASTM Task Group D11.14.04. “D 1054 will be revised to include the popular Schob-type pendulum rebound tester and other essential elements enumerated in ISO 4662 and DIN 53 512,” he explained. “D 2632 will be revised to incorporate the description and specifications for the spring calibration device as well as expanding the calibration procedure, which was originally developed by Jack Warner’s TG some five years ago.

“Pending the approval of the revisions to D 1054 and D 2632,” he added, “new ITPs [interlaboratory test programs] will be undertaken with the purpose of developing updated Precision and Bias statements, under the guidance of TG D11.14.04.”

Revisions to ASTM D 2632 are important as they will greatly improve intra- and interlaboratory test results; the forthcoming revisions to D 1054 are critical as they will address the most prevalent and popular pendulum rebound instruments currently in use by the industry, Warner concluded.

For further technical information, contact Michael Kent Warner, CCSi, Inc., Seattle, Washington (phone: 360/697-6993). Committee D11 meets Dec. 3-6, Dallas, Texas. For meeting or membership details, contact Tim Brooke, manager, ASTM Technical Committee Operations (phone: 610/832-9729). //

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