ACP31

Material description

Material ID: ACP31

Material type: Aluminium alloy composite panel with a core consisting of an aluminium foil honeycomb structure connected with a ethylene-acrylate acid (EAA) copolymer adhesive.

Polymer: Ethylene-acrylate acid copolymer (0%)

Additives (fire retardants, fillers or traces of inorganic elements): Aluminium (47%), Zinc (22%), Iron (21%), Sodium (14%), Silicon (1%), Magnesium (1%), traces of other elements (<1%)

Table 1. Estimated mass concentration of compounds.

Compound	Mass Concentration (%)
Ethylene-acrylate acid copolymer (EAA)	0
Aluminium (Al)	47
Zinc (Zn)	22
Iron (Fe)	21
Sodium (Na)	14
Silicon (Si)	1
Magnesium (Mg)	1
Traces of chlorine (Cl)	<1
Traces of hafnium (Hf)	<1
Traces of tantalum (Ta)	<1

A. Material composition identification

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

Table 2. FTIR compound identification.

Identified Compounds
Ethylene-acrylate acid copolymer (EAA)
Aluminium (Al)
Zinc (Zn)
Iron (Fe)

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 (%)
Al	47
Zn	22
Fe	21
Na	14
Si	1
Mg	1
Cl	<1
Hf	<1
Ta	<1
Mn	<1

B. Thermogravimetric analysis

Table 3. Mass fraction of residue after thermal decomposition.

Condition	Fraction of mass residue at 800°C
Non-oxidative (nitrogen)	0.01
Oxidative (air)	0

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

Peak ID	Temperature peak (°C)	Amplitude of peak (°C^-1)
Peak 1	476	2.229 x 10^-2

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

Peak ID	Temperature peak (°C)	Amplitude of peak (°C^-1)
Peak 1	280	1.21 x 10^-3
Peak 2	404	9.64 x 10^-3
Peak 3	428	1.07 x 10^-2
Peak 4	472	1.372 x 10^-2
Peak 5	530	1.87 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 .