Critical Oxygen Index Test Apparatus
The digital oxygen index tester is designed and de-veloped according to ISO4589-3 (Elevated-temperature test) and British Naval Engi-neering Standard NES 715. Based on the general intelligent oxygen index instrument,the high temperature oxygen index tester adds a electric-heating device at the position of the combustion cylinder to preheat the mixed gas and test the ignition temperature of the different materials at a certain oxygen concentration.
Application
(1) Determination of limiting oxygen index (LOI) for plastics, textiles, and rubber
(2) Evaluation of flame retardant performance of polymer materials
(3) Fire behavior testing of electrical cables and insulation materials
(4) Material screening for fire safety compliance in construction and transportation
(5) Elevated-temperature combustion testing for advanced materials
(6) Quality control and R&D in flame-retardant material development
Standards
ASTM D 2863 Standard Test Method for Measuring the Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index)
ISO 4589-2 Plastics-Determination of burning behaviour by oxygen index –Part 2: Ambient-temperature test
CEI 20-22/4 Tests on electric cables under fire conditions-Part 3: Tests on bunched wires or cables
ISO 13501,
BS 2782 Pt 141,
ISO: 4589-3,
NES 714,
NES 715
Parameters
| Item | Specifications |
|---|---|
| Oxygen Concentration Resolution | ±0.1% |
| Sample Size (Non-self-supporting) | 150 × 37.5 mm, thickness ≤ 12 mm |
| Sample Size (Self-supporting) | Length 150 mm, diameter ≤ 10 mm |
| Chimney Material | Heavy-duty Pyrex glass |
| Temperature Control | Integrated electric heating system |
| Gas Control | Automatic oxygen and nitrogen flow adjustment |
| Display | Digital (O₂ concentration, flow rate, temperature, time) |
| Calibration | Automatic |
| Dimensions | 460 × 410 × 780 mm |
| Weight | Approx. 45 kg |
Features
(1) Measures minimum oxygen concentration required for sustained combustion
(2) Integrated elevated-temperature testing capability for advanced materials
(3) High-precision oxygen analyzer with ±0.1% accuracy
(4) Automatic gas mixing ensures stable and repeatable test conditions
(5) Digital control interface for easy parameter setting
(6) Real-time display of oxygen concentration, temperature, and test status
(7) Compatible with both self-supporting and flexible samples
(8) Built-in flowmeters, valves, and filters for simplified operation
(9) Durable Pyrex combustion chimney for high-temperature resistance
FAQ
(1) What does the oxygen index value indicate?
The oxygen index represents the minimum oxygen concentration required to sustain combustion. Materials with higher values are more flame-resistant. For example, typical polymers burn at around 18–21% oxygen, while flame-retardant materials show significantly higher values.
(2) Why is elevated-temperature testing necessary?
Some materials behave differently at higher temperatures. ISO 4589-3 evaluates ignition and combustion under preheated conditions, providing more realistic fire performance data for applications exposed to heat.
(3) How is test accuracy ensured?
Accuracy depends on stable gas mixing and precise oxygen measurement. The instrument uses automatic flow control and an oxygen analyzer with ±0.1% resolution, ensuring consistent and repeatable results across tests.
(4) What types of materials can be tested?
The apparatus supports both self-supporting materials (plastics, wood) and non-self-supporting samples (textiles, films). Proper sample preparation according to standards is essential for valid results.
(5) What should be considered when selecting an oxygen index tester?
Key factors include oxygen measurement accuracy, temperature capability, gas control stability, and compliance with ISO 4589 standards. Selection should match your testing scope and material types. For detailed guidance, consult QINSUN engineers.
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