Toxicity index tester manufacturer
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The Toxicity Index Tester is a specialized instrument designed for evaluating the toxicity of combustion gases generated from flame-retardant and fire-resistant wires, cables, and optical cables. Based on controlled thermal decomposition or combustion in a tube furnace, the system introduces a defined flow of smoke into standard absorption solutions or gas sampling bags for subsequent quantitative analysis. The tester is widely applied in smoke toxicity assessments required by railway, cable, and fire safety standards, providing reliable data to support material safety evaluation under fire conditions.
Standards
The system complies with the following standards and test methods:
(1) GB/T 19666 – General Rules for Flame-Retardant and Fire-Resistant Wires, Cables or Optical Cables
(2) EN 50305 – Railway Applications – Test Methods for Fire Behaviour of Electric Cables
(3) BS 6853 Annex B – Code of Practice for Fire Precautions in the Design and Construction of Passenger Carrying Trains
(4) ISO 19700 – Controlled Equivalence Ratio Method for the Determination of Toxic Product Yields in Fire Effluents (Steady-State Tube Furnace Method)
(5)ASTM E1678
(6)NFPA 269
Parameters
| Item | Specification |
|---|---|
| Tube furnace heating length | 600 mm |
| Temperature range | 0–1100 °C |
| Temperature accuracy | ±0.1 °C |
| Quartz tube | Heat-resistant quartz, thickness ≥ 2 mm |
| SO₂ measurement range | 0–1000 ppm |
| SO₂ resolution | 1 ppm |
| SO₂ accuracy | ±30 ppm |
| NOₓ measurement range | 0–3000 ppm |
| NOₓ resolution | 1 ppm |
| NOₓ accuracy | ±30 ppm |
| Gas sampling bag | PTFE-coated, 80 L capacity, with imported manual sampler |
| CO measurement range | 0–10 % |
| CO resolution | 0.01 % |
| CO accuracy | Absolute ±0.1 % or relative ±3 % |
| CO₂ measurement range | 0–20 % |
| CO₂ resolution | 0.01 % |
| CO₂ accuracy | Absolute ±0.2 % or relative ±3 % |
| Spectral analysis device | Spectrometer at 500 nm wavelength, membrane thickness 10 mm |
| Absorption solution | 0.1 N NaOH |
| Titration reagents | Picric acid aqueous solution (3 g/dm³) and sodium carbonate aqueous solution (50 g/dm³) |
Features
Sealed chamber design with the smoke generation system installed internally, providing stable operation and effective protection of core components
Large observation window allowing clear visual monitoring of test status and specimen movement
Integrated industrial design with panel-mounted structure, offering intuitive operation and ergonomic user interface
Tube furnace protected by perforated outer housing to enhance heat dissipation and ensure uniform temperature rise to the target value
High-temperature K-type thermocouple for accurate measurement of specimen zone temperature
Ceramic combustion boat driven by strong magnetic coupling and transmission mechanism for stable and repeatable specimen delivery into the furnace core
Precision lead-screw transmission system enabling accurate positioning and reliable sealing of the quartz tube, reducing the risk of damage due to manual operation
Dual filtration columns filled with activated carbon and color-changing silica gel for effective carrier gas purification and drying
Branded computer with dedicated control software for automatic test process control
Software-based temperature regulation and stabilization with real-time curve recording, automatic data display, storage, and report generation
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