Critical Limiting Oxygen Index Test Apparatus Instruction

Critical limiting oxygen index tester is mainly used to measuring a variety of materials such as woven fabrics, rubber, plastic, foam, wood and other polymer materials. It consists of a sample holder, a combustion cylinder, flow meter, gas supply and control system.

Sample holder: sample holder is to support the vertical specimen in the center of the combustion cylinder. According to the standard provisions,  for the self-supporting material, sample holder should be at least 15 mm away from the nearest flaming spot; while for the non-self-supporting material such as a film or sheet, we should use a frame with vertical side to support, and mark lines on 20 mm and 100 mm to the top of frame. The holder and supporting frame should be made smooth in order to reduce disruption updraft.

     

critical limiting oxygen index test apparatus

 Combustion cylinder: This part consists of heat-resistant glass cylinder which is fixed to the base and can import oxygen & nitrogen gas mixture composition. Critical limiting oxygen index test apparatus standard combustion cylinder height is of (500 ± 50) mm, and the inside diameter (75 ~ 100) mm.

Gas source: Generally we use oxygen and nitrogen whose content should be more than 98% as the gas source.

Timer: Precise stopwatch measuring time can be up to 5 min with the accuracy of ± 0.5s.  Exhaust ventilation systems: material burning gives out poisonous gas thus smoke ventilation system must be installed to spread the smoke and gas. But the wind speed should be not too fast in case that gas flow rate and temperature in combustion cylinder or even testing accuracy be affected.

Igniter: Composed of a metal pipe with the diameter of (2±1) mm which can connect gas flame standard. When the sample is being ignited, you can adjust the gas amount so that the flame can be ejected from the outlet vertically downwards (16 ± 4) mm. The combustion gas is supposed to be pure propane gas.

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