Combustion smoke toxicity tester
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The GB/T 19666 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.
Application
The ASTM E1678 Combustion smoke toxicity tester is used for smoke toxicity testing in accordance with multiple international and regional standards. Typical application scenarios include:
Flame-retardant and fire-resistant power cables
Railway rolling stock cables and signal cables
Optical fiber cables and communication cables
Polymer insulation and sheath materials
Halogen-containing and halogen-free cable compounds
The instrument supports both absorption-liquid analysis and gas bag collection methods, allowing flexible downstream analysis depending on the test standard and laboratory requirements.
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) |
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