Heat Distortion Temperature: One of the Top Advantages of CPVC

One of the benefits of CPVC over competitive materials is its superior heat resistance.

Heat Distortion Temperature (HDT) is a very important metric, as it indicates the temperature at which the material will become soft enough to distort even a small mechanical load. If the temperature stays above HDT, permanent deformation will occur. CPVC generally is used in hot temperature environments since it has one of the highest HDTs among competitive plastics. The table below shows the heat distortion temperature (HDT) as compared to other plastics. While the exact values will differ due to grade and manufacturer, the general trend will remain true: CPVC compound has one of the highest HDTs in the plastics industry.

References for HDT data:

  1. SEKISUI internal test data  2. The Chemical Society of Japan

The HDT improves in correlation with the chlorine content in CPVC compound. As can be seen in the chart below, as the chlorine content increases, so does the HDT. SEKISUI produces  CPVC compounds that range in colors, chlorine content, and flexibility to meet the needs of building, home goods, transportation, and specialty manufacturers.