Limiting Oxygen Index (LOI) Tester
New 28 11 月, 2025
The Limiting Oxygen Index (LOI) Tester measures the minimum oxygen concentration required for a material to sustain combustion. By controlling the oxygen-nitrogen mixture, it observes the combustion characteristics of samples, determining the ultimate oxygen index. This instrument is ideal for quality control, material R&D, and compliance testing of textiles, plastics, rubbers, foams, laminates, films, and other solid materials.
High repeatability ensures reliable data, helping manufacturers control production, evaluate product performance, and guide material development.
Applications
Determination of flammability of polymers, textiles, rubber, foams, films, and plastics.
Quality control and product acceptance in production departments.
R&D of flame-retardant materials.
Third-party testing laboratories for certification and material performance evaluation.
Technical supervision and inspection agencies to verify material safety standards.
Compliance Standards
GB/T 2406.1 & 2406.2 – Plastics: Test of burning behavior by oxygen index
GB/T 5454 – Textiles: Burning performance by oxygen index
GB/T 10707 – Rubber: Burning performance
ISO 4589-2 – Plastics: Determination of burning behavior by oxygen index
ASTM D2863 – Standard test method for measuring minimum oxygen concentration
EN 45545-2, JIS 7201, BS 2782, NES 714
Key Features
High-Precision Oxygen Sensor: Imported paramagnetic sensor provides stable, real-time detection of oxygen concentration with PLC control.
Flexible Fixture Design: Refractory and stainless steel holders support a variety of sample types; easy replacement for different specimen requirements.
Intelligent Touch Operation: 7-inch color touchscreen with multi-language (Chinese/English) interface for simplified operation.
Quick-Change Test Tube: High-temperature resistant transparent glass tube with easy cleaning and observation.
Durable Construction: Stainless steel base resists corrosion, ensuring long-term reliability.
Accurate & Efficient: Rapid adjustment of oxygen concentration and precise burn observation for high repeatability results.
Technical Specifications
| Parameter | Specification |
|---|---|
| Operating Mode | Full-color touch screen control |
| Control Range | 0–100%, ±0.2% |
| Language | Chinese-English interface |
| Air Inlet Pressure | ≤1 MPa |
| Test Air Pressure | 0.15–0.2 MPa |
| Burner Inner Radius | 79 mm |
| Burner Height | 500 mm |
| Glass Beads | 4 mm diameter, 80–100 mm height |
| Gas Flow Rate | 12.01 L/min |
| Igniter Inner Diameter | 2 mm |
| Igniter Length | 400 mm |
| Air Inlet Diameter | 7 mm |
| Dimensions | 700 × 750 × 460 mm |
| Weight | 45 kg |
| Power Supply | AC 220V 50Hz |
FAQ
1. What materials can be tested with the LOI tester?
Textiles, plastics, rubbers, foams, laminates, films, and other solid polymers.
2. How does the instrument determine the limiting oxygen index?
The sample is fixed vertically in a transparent combustion tube; oxygen-nitrogen mixture flows upward, and the top of the sample is ignited. The minimum oxygen concentration sustaining combustion is recorded.
3. Is the tester easy to operate?
Yes, the 7-inch touchscreen interface with Chinese-English display and quick-change design makes operation simple and efficient.
4. Can the instrument provide repeatable and accurate results?
Yes, imported paramagnetic oxygen sensors and PLC control ensure high-precision, reproducible measurements.
5. Is it suitable for quality control and R&D purposes?
Absolutely. It supports material R&D, production QC, third-party certification, and compliance testing.
