The Oxygen Index Tester is used to determine the minimum oxygen concentration (oxygen index) required to just sustain combustion of materials in a combustion cylinder with a controlled mixture of oxygen and nitrogen. This value is used to evaluate the combustion performance classification of materials or for product quality control.
This instrument is suitable for testing the combustion performance of strip- or block-shaped materials with a thickness less than 10.5 mm that can support themselves vertically. It also applies to homogeneous solid materials, laminated materials, or foam materials with an apparent density greater than 100 kg/m³. Additionally, it is suitable for certain foam materials with an apparent density less than 100 kg/m³.
Typical materials include plastics, rubber, insulation materials, flame-retardant fabrics, composite materials, extruded boards, fiberglass-reinforced plastics, wires and cables, waterproofing materials, fibers, ropes, flame-resistant materials, foams, polyurethane, asphalt, soft films, wood, films, etc.
Note: For evaluating flame spread characteristics of foam materials with a density below 100 kg/m³, relevant equipment specified in GB/T 8332 should be used.
Conforms to the following standards:
GB/T 2406.2-2009
ISO 4589.2-1996
GB 8624-2012
Oxygen concentration measurement range: 0–100%
Measurement accuracy: ±0.1%
Display mode: Digital display
Zero adjustment: Available
Full-scale adjustment: Available
Working pressure: 0.05–0.15 MPa
Pressure gauge range: 0–0.4 MPa
Pressure gauge accuracy: Grade 2.5
Flow rate adjustment range: 0–15 L/min
Flow meter accuracy: Grade 2.5
Response time: <5 seconds
Combustion cylinder inner diameter: 75 mm
Combustion cylinder height: 480 mm (excluding taper inlet)
Gas flow velocity in combustion cylinder: 40 mm ±2 mm/s
Environment: Temperature 23°C ±2°C, relative humidity ≤70%
Power supply: AC 220V ±5%, 50 Hz
Power consumption: 50 W
Gases used: Oxygen and nitrogen with purity ≥98% (gas cylinders, pressure regulators, and dryers are provided by the user)
Gas supply pressure: 0.1–0.3 MPa
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