ISO 844 is used to investigate the compressive behavior of cellular plastics for determining the compressive strength, compressive strength at pre-defined deformations, compressive modulus, and other aspects of the compressive stress/strain relationship under the conditions defined.
In principle, the test specimen is centrally positioned between the two parallel anvils then compressed along its major axis at a constant rate of displacement until the specimen has deformed as a percentage of the specimen's original height.To record the test it is important to have a high speed intelligent test data logging rate.This is the transfer rate to the PC of 100Hz or more to capture and record all data.