Thermal Stability Test Apparatus For PVC

Thermoplastics and PVC  (Plasticized Polyvinyl Chloride) materials when exposed to continuous heat, degenerates and emit harmful acidic gases. The instrument is manufactured for testing PVC materials against their thermal stability at higher temperature.

Thermoplastics and PVC materials when exposed to continuous heat, degenerates and emit harmful acidic gases. The instrument is manufactured for testing PVC materials against their thermal stability at higher temperature. The basic principal is that the pH paper changes its color when it comes in contact with halogen gases, released by PVC and its compounds on heating at higher temperatures.

The Instrument is especially designed to suit the requirement of IS: 5831, IS 10810 (Pt 60), IEC 540

The instrument consists of

    One solid Aluminum block used as the heating medium.
    15 holes are drilled in the aluminum block for keeping the sample.
    Specially designed embedded / Jacket heaters in the thermal block.
    Digital Temperature Indicating Controller for precise setting & control of temperature.

Consumables like ph paper & test tubes are not part of the standard equipment and are available at extra cost. A stop watch has to be provided by the user.

The sample is put inside a glass test tube and the test tube is dipped into the per heated Thermal Block. A small piece of ph paper is attached to the test tube. The time of insertion of tube is noted down. As the PVC disintegrates, it release acidic fumes which changes the color of ph paper. The time of change of color is again noted down. Using these times, the thermal stability time is determined for the PVC sample