TST-300 Congo Red Thermal Stability Tester is used to determine the thermal stability of PVC compounds for insulating and sheathing materials of electric cables. Test principle: Place about (50±5)mg sample into a specified glass tube. The glass tube is placed into an oil bath at a temperature of (200±0.5)℃. A Congo red paper or common pH paper is inserted into the glass tube; its other end is folded and hung on the top wall of the glass tube. Record the time during which the Congo red paper changes from red to blue (the common pH paper changes from pH5 to pH3). The time of color change is an expression of the thermal stability. This instrument complies with the following international and industry standards. IEC: IEC 811. GB/T: GB/T 8815, GB/T 2951.7. Technical Specification Model: TST-3000 Temperature range: RT~250℃ Temperature resolution: 0.1℃ Timer range: 0~99.99s Chamber: capacity 3000ml Glass: tube size Length: 1100mm External diameter: 5mm Inner diameter: 4mm Test paper: Congo red paper or pH paper Heating oil required: 2# lubricating oil or insulating oil Heater power: 1.25kW Power supply: AC220V 50Hz Dimensions: 420mm×200mm×250mm (L×W×H)