AS 4828.2-2008

This Standard specifies a method for the determination of a brittle point for degradable plastic films and sheeting less than 1.0 mm thick.

This Standard specifies a method for the determination of a brittle point for degradable plastic films and sheeting less than 1.0 mm thick. This practice is not intended for determination of the rate of degree of degradation of a plastic film or sheet, but rather, to assess when in the course of its degradation under some condition, a brittle point is reached.This Standard employs a constant rate of separation of the grips holding the sample and a static load cell.This Standard is based on the use of grip separation as a measure of extension; however, the desirability of using extension indicators accurate to ±1.0% or better as specified in ASTM D638 is recognized, and a provision for the use of such instrumentation is incorporated in the procedure.The results of this test method may be used in conjunction with the results of other test methods in this series, in particular where the plastic specimens have been exposed to ultraviolet radiation, heat and outdoor exposures, prior to testing under this Standard.The results of this test method are to be used for comparative ranking of test specimens and are not to be used as a performance standard.

First published as AS 4828.2-2008.