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       Material Testing Instruments
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Congo Red

Thermal Stability (Congo Red Method)


Model Number: SSI TSOB

Standard Number: IS: 4669

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.

 

Salient Features  
   
Heating : Wet Heating Using Oil
Heating Medium : Oil Bath
Temperature : Ambient to 225oC, LC 0.1oC
Temperature Control : PID Digital Temperature Controller, +/- 2oC
   
Delivery : 3 to 4 Weeks
Packing : One Wooden Box

Description

Principle

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 Congo Red paper changes its color when it comes in contact with halogen gases, released by PVC and its compounds on heating at higher temperatures.

Standards

The Instrument is especially designed to suit the requirement of IS: 4669

Instrument

The instrument consists of

    One oil bath to heat the oil for wet heating.

    10 Glass Test Tubes (16 mm dia).

    10 Glass test tubes (2 mm dia). 

    Digital Temperature Indicating Controller for precise setting & control of temperature.

     Stirrer for uniform Temperature throughout the oil bath

 

Consumables like Congo Red paper & test tubes are not part of the standard equipment and are available at extra cost. 

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