Thermostability of PVC and related chlorinated polymers

contributed by Metrohm | 02/08/2016

The determination of the thermostability of PVC (also called dehydrochlorination test or DHC test) characterizes the stability of polyvinyl chloride or related chlorinated polymers against heat exposure.

During the test, nitrogen is passing over the sample in the reaction vessel at constant elevated temperature. When the sample decomposes, hydrochloric acid gas is formed which is transported into the measuring vessel by the nitrogen stream and absorbed in the measuring solution (deionized water). The continuously recorded electrical conductivity of the measuring solution increases due to the absorption of the HCl gas. Thus, its appearance can be detected. The time until the conductivity has changed by a predefined value is called stability time and characterizes the thermostability of the PVC material.

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