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Contact SupplierThermoplastics 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.