SRK04-S1

Material description

Material ID: SRK04-S1

Material type: Glass fibre reinforced aluminium sarking with polyethylene (PE) backing.

Polymer: Polyethylene (79%)

Additives (fire retardants, fillers or traces of inorganic elements): Calcium (10%), Chlorine (6%), Titanium (2%), Bromine (1%), Antimony (1%), Silicon (1%), traces of other elements (<1%)

Table 1. Estimated mass concentration of compounds.

Compound	Mass Concentration (%)
Polyethylene (PE)	79
Calcium (Ca)	10
Chlorine (Cl)	6
Titanium (Ti)	2
Bromine (Br)	1
Antimony (Sb)	1
Silicon (Si)	1
Traces of scandium (Sc)	<1
Traces of magnesium (Mg)	<1
Traces of aluminium (Al)	<1

A. Material composition identification

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

Table 2. FTIR compound identification.

Identified Compounds
Polyethylene (PE)

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 (%)
Ca	10
Cl	6
Ti	2
Br	1
Sb	1
Si	1
Sc	<1
Mg	<1
Al	<1
Fe	<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)	0.08
Oxidative (air)	0.05

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

Peak ID	Temperature peak (°C)	Amplitude of peak (°C^-1)
Peak 1	304	1.57 x 10^-3
Peak 2	490	2.602 x 10^-2
Peak 3	682	7.7 x 10^-4

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

Peak ID	Temperature peak (°C)	Amplitude of peak (°C^-1)
Peak 1	302	1.48 x 10^-3
Peak 2	458	1.138 x 10^-2
Peak 3	654	4.8 x 10^-4

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 .