Plasticity is determined by taking a sample of known size, preheating it to a predefined test temperature for a precise time, and then subjecting it to a compressive force of 5,000g. The resultant thickness is the plasticity.

The Model P-4 is used to determine the plasticity and recovery of uncompounded, compounded, and reclaimed stocks of unvulcanized rubber and rubber-like materials. It conforms with the requirements of ASTM-D-926.

An Auxiliary dial indicator can be supplied with a micrometer gauge having a presser foot actuated by a dead weight force required for recovery measurements. Also available for use with this tester is a die to cut a uniform test sample to ASTM procedures.

A digital indicator with hookup to a PC with BENZWIN2000 software for automated data collection is also available. This allows the user the ability to collect and compare data, and make test reports with histograms effortlessly.
Unit of Measure



N/A P-4


N/A ASTM-D-926

Compressive Force

N/A 5000 g