Digital Oxygen Index Tester
Category：Textile Functional Tester
Introduction
The Digital Oxygen Index Tester is designed to determine the combustion performance of plastics, rubber, textiles, films, foams, and related materials. Equipped with an imported oxygen sensor and precise digital control system, it provides accurate and reliable oxygen concentration measurement from 0–100%. The instrument complies with GB/T 2406.2-2009 and other international standards, featuring adjustable gas flow, stable ignition control, and durable structural design to ensure safe and efficient laboratory testing.
Application
Suitable for determining the combustion performance of materials such as plastics, rubber, fibers, foamed plastics, soft sheets, thin films, and textiles.
Standard
Design Standard:
GB/T 2406.2-2009：Plastics — Determination of Burning Behaviour by Oxygen Index — Part 2: Ambient-Temperature Test Method
Meets standards：
ASTM D2863：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
NES 714：Fire Tests on Building Materials and Structures — Determination of the Oxygen Index of Materials
GB/T 5454：Textiles — Burning Behaviour — Determination of Oxygen Index
GB/T 10707-2008：Rubber — Determination of Burning Characteristics — Oxygen Index Method
GB/T 8924-2005：Fiber Reinforced Plastics — Determination of Burning Characteristics — Oxygen Index Method
GB/T 16581-1996：Insulating Liquids — Determination of Burning Characteristics — Oxygen Index Method
NB/SH/T 0815-2010：Petroleum Products — Determination of Burning Characteristics — Oxygen Index Method
TB/T 2919-1998：Railway Locomotive and Rolling Stock Materials — Determination of Oxygen Index
IEC 61144-1992：Determination of the Limiting Oxygen Index of Insulating Liquids
ISO 15705-2002：Fine Ceramics (Advanced Ceramics, Advanced Technical Ceramics) — Determination of Oxygen Index
ISO 4589-2-1996：Plastics — Determination of Burning Behaviour by Oxygen Index — Part 2: Ambient-Temperature Test
Parameters
| Technical Parameter | Specification |
| Oxygen Sensor | Imported oxygen sensor adopted. Digital display of oxygen concentration without manual calculation. Measuring range: 0–100%, with higher precision and accuracy. |
| Digital Resolution | ±0.1% |
| Overall Measurement Accuracy | Class 0.4 |
| Flow Adjustment Range | 0–10 L/min (60–600 L/h) |
| Response Time | < 5 s |
| Combustion Tube | Inner diameter ≥ 75 mm; Total height ≥ 450 mm |
| Gas Flow Velocity in Combustion Tube | 40 mm ± 2 mm/s |
| Pressure Gauge | Accuracy Class 2.5; Resolution: 0.01 MPa |
| Flowmeter | Adjustable range 1–15 L/min (60–900 L/h); Accuracy Class 2.5 |
| Test Environment | Ambient temperature: Room temperature to 40°C; Relative humidity ≤ 70% |
| Input Pressure | 0.2–0.3 MPa |
| Working Pressure | Nitrogen: 0.05–0.15 MPa; Oxygen: 0.05–0.15 MPa |
| Gas Mixing System | Oxygen/Nitrogen mixed gas inlet includes pressure regulating valve, flow control valve, gas filter, and mixing chamber |
| Specimen Holder (General) | Suitable for soft and rigid plastics, textiles, fire doors, etc. |
| Ignition System | Propane (butane) ignition system; flame length adjustable from 5 mm to 60 mm |
| Gas Requirement | Industrial nitrogen and oxygen, purity > 99% (supplied by user) |
| Power Supply | AC 220V (+10%), 50 Hz |
| Maximum Power Consumption | 50 W |
| Igniter | Metal tube with nozzle inner diameter Φ2 ± 1 mm; can be inserted into combustion tube; flame length 16 ± 4 mm, adjustable |
| Self-Supporting Specimen Holder | Fixed at the axis position of the combustion tube; clamps specimen vertically |
| Non-Self-Supporting Specimen Holder | Fixes two vertical edges of specimen on frame (optional; suitable for textiles, films, etc.) |
Cabinet and Structural Components
Control Cabinet:
Manufactured by CNC machining. The enclosure is made of steel plate with electrostatic powder coating. The control section and the test section are separately designed and controlled.
Combustion Tube:
High-temperature-resistant high-quality quartz glass tube (inner diameter Φ75 mm, length 480 mm); outlet inner diameter: Φ40 mm.
Specimen Holder:
Self-supporting clamp capable of holding the specimen vertically (optional non-self-supporting specimen frame available). Two sets of specimen holders are provided to meet different testing requirements. Plug-in type design makes specimen installation easier and more convenient.
Long Rod Igniter:
The nozzle inner diameter at the tail end of the igniter is Φ2 ± 1 mm. The flame length is adjustable from 5 mm to 50 mm.
Accessories
| Item | Quantity |
| Main Unit | 1 set |
| Combustion Tube | 1 set |
| Igniter | 1 pc |
| Power Cord | 1 pc |
| Glass Tube | 1 pc |
| Nylon Tube Φ4 (for connection between combustion tube and main unit) | 1.2 m |
| Sealing Rings | Several |
| Pointed Specimen Holder | 1 set |
| Metal Mesh (placed inside the combustion column) | 1 pc |
| Stainless Steel Gas Outlet Plate | 1 pc |
| Rubber Hoses | 2 pcs |
| Instruction Manual | 1 copy |
| Non-Self-Supporting Specimen Holder (Optional) | 1 set |
FAQ
1. What is this product?
It is a laboratory instrument used to determine the limiting oxygen index (LOI) of materials.
2. What is this product used for?
It evaluates the minimum oxygen concentration required to sustain combustion, indicating material flame retardancy.
3. Why is this product important?
LOI is a key fire performance parameter used for material selection, safety compliance, and flame-retardant development.
4. What industries is this product suitable for?
Plastics, rubber, textiles, cable materials, construction materials, rail transit, and research laboratories.
5. What types of this product are available?
Standard digital LOI testers, high-precision research models, and configurations with optional non-self-supporting specimen fixtures.
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