PN-B-02855
Laboratory
TESTING
THE RELEASE OF TOXIC DEGRADATION PRODUCTS OF COMBUSTING MATERIALS
WITH A METHOD ACCORDING TO POLISH STANDARD PN-B-02855
The
principle of the method consists in the quantitative determination of
the products of thermal decomposition and combustion of materials
decisive for the toxicity of the fire environment. The thermal
decomposition and combustion of samples of the test material shall be
carried out in a movable horizontal tube furnace (Fig 1) at
temperatures of 450 oC,
550 oC
and 750 oC.
At the time of the test, the specific mass emissions of CO2,
HCN, NO, NO2,
SO2
and HCl shall be determined, which means the mass of the toxic
product produced during the thermal decomposition and combustion of
the material mass unit in the test conditions concerned.
Stand
for testing the release of toxic degradation products of combusting
materials with a method according to PN-B-02855
The FTIR analyser is used to measure the specific mass emission, which measures continuously the mass concentration – cmi of the CO, CO2, HCN, NO, NO2, SO2 and HCl in the flowing products of the thermal decomposition and the combustion of the material sample. On this basis, for the specific weight of the mp sample and the volume flow rate of the gases. The control-measuring system of the position shall determine the mass emission Ei for each of the measured gases.
On this
basis, for the mass of sample
and the volume flow rate of the gases,
the
control-measuring
system shall determine the
mass emission Ei for each of the measured gases. On the
basis their
average values are defined toxicity
index
- WLC50SM,
which
is
the mean value of the toxicity
indexes
defined at temperatures 450oC,
550oC
and 750oC.
In
depending
on the value WLC50SM
he thermal
decomposition and combustion products of the test material are
classified as follows:
WLC50SM ≤ 15 |
decomposition
and combustion products very toxic |
15 < WLC50SM ≤ 40 |
decomposition
and incineration products toxic |
WLC50SM > 40 |
degradation
and combustion products are moderately toxic |
The FTIR Analyzer is located in the adjacent room. This reduces the impact of air pollutants in the test zone the result of a spectrum analysis.
Test
specimen.
The
test at each temperature must be prepared after 3 samples. The mass
of the sample should be 4+/-0.1g and should be evenly distributed
over the length of the cuvette. Has The maximum thickness of the
sample should be 5mm. For materials with an apparent density less
than 0.1g/cm3
a solid sample is allowed to a thickness of 10mm. Samples must be
prepared by the appropriate processing method for the material or by
cutting of the finished product with the layers representativeness.
Applying
research methods
– in Polish civil
engineering
for toxicity studies of furniture thermal decomposition and
combustion products.