INS07

Material description

Material ID: INS07

Material type: Straw - organic insulation

Polymer: Cellulose (92%)

Additives (fire retardants, fillers or traces of inorganic elements): Silicon (5%), Potassium (2%), Calcium (1%), Chlorine (1%), traces of other elements (<1%)

Table 1. Estimated mass concentration of compounds.

Compound	Mass Concentration (%)
Cellulose (-)	92
Silicon (Si)	5
Potassium (K)	2
Calcium (Ca)	1
Chlorine (Cl)	1
Traces of iron (Fe)	<1
Traces of sulfur (S)	<1
Traces of zinc (Zn)	<1
Traces of magnesium (Mg)	<1

A. Material composition identification

A.1 Attenuated total reflection – Fourier transform infrared spectroscopy (ATR-FTIR)

Table 2. FTIR compound identification.

Identified Compounds
Cellulose (-)

Figure 1 . FTIR spectra: Absorbance percentage versus wavenumber from the sample.

Figure 2. FTIR spectra: Absorbance percentage versus wavenumber from the sample and the identified compounds.

A.2 Energy Dispersive X-Ray Fluorescence (EDXRF)

Table 2. Inorganic elements and their mass concentration identified with EDXRF.

Element	Mass Concentration (%)
Si	5
K	2
Ca	1
Cl	1
Fe	<1
S	<1
Zn	<1
Mg	<1

Figure 3. EDXRF spectra. Counts vs energy. Identified elements are shown as vertical lines.

B. Thermogravimetric analysis

Table 3. Mass fraction of residue after thermal decomposition.

Condition	Fraction of mass residue at 800°C
Non-oxidative (nitrogen)	0.26
Oxidative (air)	0.09

Table 4. Temperature and amplitude of main peaks in non-oxidative conditions.

Peak ID	Temperature peak (°C)	Amplitude of peak (°C^-1)
Peak 1	345	9.26 x 10^-3

Table 5. Temperature and amplitude of main peaks in oxidative conditions.

Peak ID	Temperature peak (°C)	Amplitude of peak (°C^-1)
Peak 1	302	1.053 x 10^-2
Peak 2	418	5.16 x 10^-3

Figure 4. Normalised mass (solid line) and derivative of the normalised mass (dashed line) in 150 ml min^-1 of nitrogen and a heating rate of 20°C min^-1.

Figure 5. Normalised mass (solid line) and derivative of the normalised mass (dashed line) in 150 ml min^-1 of air and a heating rate of 20°C min^-1 .