Limiting Oxygen Index Chamber

What is the Limiting Oxygen Index Chamber

The Limiting Oxygen Index (LOI) Chamber is a testing device used to determine the minimum concentration of oxygen required to support the combustion of a material. In this test, a sample is placed in a vertical chamber, and the oxygen and nitrogen levels are adjusted until the material can no longer sustain a flame. The result, known as the Limiting Oxygen Index, indicates the material’s flammability and is expressed as a percentage of oxygen in the gas mixture.

Compliance：ISO 4589-3:2017 "Plastics - Determination of burning behavior by oxygen index Part 3: Elevated-temperature Test". ASTM D2863, BS ISO 4589-2, NES 714

Main parameters:

1. Test temperature: continuous setting from room temperature to 150℃;

2. Temperature deviation: ±1%℃;

3. Oxygen concentration (oxygen index): direct reading by digital display. Resolution: 0.1%.

4. Air supply pipeline: flow meter, pressure gauge and needle valve.

5. Measuring range: 0~100%/O2, resolution: 0.1%L/min

6. Measurement accuracy: class 2.5

7. Combustion cylinder: quartz glass cylinder, inner diameter: 75mm, height: 450mm

8. The gas flow rate at the top of the combustion cylinder: 90mm±10mm/s

9. The gas flow rate in the combustion cylinder: 40mm±2mm/s

10. Input pressure: adjustable from 0.25 to 0.5 Mpa

11. Flow meter: one for oxygen and one for nitrogen, range 1~10L/min, resolution 0.1L/min

12. Oxygen and nitrogen mixed gas inlet: including pressure regulator valve, flow regulating valve and mixing chamber.

13. Ignition: dedicated propane hand-held electronic electric firearms. Using a copper tube with a diameter of 2.0mm, the flame can be adjusted to spray 16mm±4mm vertically downward from the outlet.

14. Specimen clamps: one set of hard self-supporting material and one set of soft material clamp;

15. Heating system: use nickel-chromium alloy rapid heating electric heating wire, which is wound on the glass tube in sections to ensure the uniform temperature in the test tube

16. Temperature measurement system: mineral insulated heater thermocouple ￠1.5mmmm

17. Gas source: oxygen and nitrogen with a purity of more than 98% (provided by the buyer);

18. Power requirements: AC220 (±10%) V/50HZ;

19. Dimensions: L630*W350*H655 (unit: mm