Test method for determination of gas concentrations in ISO 5659-2 using Fourier transform infrared spectroscopy
1Key Takeaways
This document specifies a test method suitable for the analysis of smoke generated during the pyrolysis and combustion of samples and products in accordance with ISO 5659-2. The test method is based on Fourier transform infrared (FTIR) spectroscopy as described in ISO 19702 and provides information on the application o…
2Expert Interpretation
This expertly interprets the ISO/TS 19021:2018 standard, detailing the technical method for determining gas concentrations in ISO 5659-2 tests based on Fourier transform infrared spectroscopy (FTIR). This section covers equipment configuration, sampling system requirements, calibration procedures, and test accuracy analysis, applicable to material combustion emission studies in the fire safety field.
Technical requirements for key equipment
| Components | Technical requirements | Allowance deviation |
|---|---|---|
| Sampling probe | Stainless steel, 3 2mm sampling holes | Position deviation±2mm |
| Main filter | PTFE material, 2μm pores | Temperature±10°C |
| FTIR gas cell | ≤0.5L volume | Pressure±1.33kPa |
Test procedures and data analysis
The standard requires daily leak checks and instrument status verification before testing. Gas concentration is calculated using the formula:
Cm = φc × (Pchamber × Mgas) / (R × Ts)
Key parameters require time offset correction, and the response time should be ≤ 20 seconds.
Implementation recommendations and precautions
- For halogen-containing materials, it is recommended to use PTFE filters to avoid gas adsorption
- The test report should include: maximum concentration value, time series data, coefficient of variation analysis
- Inter-laboratory comparison shows that the reproducibility standard deviation of HCl determination is 12-26%
Technology evolution background
This standard is based on the research results of the TRANSFEU project (references [3][4]), and the precision parameters were established through multi-laboratory verification. Comparison data with large-scale combustion tests (ISO 21367/16405) show that the HCl release results are in good agreement (deviation < 3%).