ACP06-S1

Material description

Material ID: ACP06-S1

Material type: Aluminium composite panel consisting of an egg-box core with polymer adhesive on both sides - S1 - profiled side.

Polymer: Ethylene-vinyl acetate (-%)

Core thickness: 3.46mm

Table 1. Estimated mass concentration of compounds.

Compound	Mass Concentration (%)
Ethylene-vinyl acetate (EVA)	-

A. Material composition identification

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

Table 2. FTIR compound identification.

Identified Compounds
Ethylene-vinyl acetate (EVA)

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.

B. Thermogravimetric analysis

Table 3. Mass fraction of residue after thermal decomposition.

Condition	Fraction of mass residue at 800°C
Non-oxidative (nitrogen)	0
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	479	2.354 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	417	8.68 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 .

C. Gross Heat of Combustion

Table 7. Gross Heat of Combustion individual results for sample.

Trial	ΔH_c [kJ g^-1]
Trial 1	46.21
Trial 2	46.68
Trial 3	44.60
Average	45.83
Std dev	1.09

Additional information:

Only the organic component (the resin) is tested in the bomb calorimeter, as described in Protocols for the Material Library supporting documents.

D. Ignition parameters

Table 8. Summary of ignition parameters for sample.

Critical heat flux for ignition	Ignition temperature	Total heat transfer coefficient of losses	Apparent thermal inertia
q̇″_cr [kW m⁻²]	T_ig [°C]	h_r [W m^-2 K^-1]	kρc [kW² m^-4 K^-2 s]
30.10	519	54.30	0.378

Figure 6. Time-to-ignition vs incident radiant heat flux for samples.

E. Burning behaviour

Table 9. Summary of key burning behaviour metrics.

Heat flux	Test	Time to ignition	Fraction of mass residue	Peak heat release rate	Total energy released
q̇″_inc [kW m^-2]		t_ig [s]	m_res [-]	q̇″_p [kW m^-2]	Q_t [MJ m^-2]
35 kW m^-2
	Test 1	63	0.88	139.95	10.54
	Test 2	57	0.90	135.65	7.81
	Avg	60	0.89	137.80	9.17
50 kW m^-2
	Test 1	33	0.88	167.61	11.16
	Test 2	24	0.89	155.48	9.60
	Avg	28	0.88	161.55	10.38
60 kW m^-2
	Test 1	34	0.91	132.97	9.19
	Test 2	33	0.91	114.46	9.33
	Avg	34	0.91	123.72	9.26
80 kW m^-2
	Test 1	-	-	-	-
	Test 2	-	-	-	-
	Avg	-	-	-	-

Figure 7. Normalised mass loss over time for samples tested with 35, 50, 60 and 80 kW m^-2.

Figure 8. Heat release rate per unit area over time for samples tested with 35, 50, 60 and 80 kW m^-2.

Table 10. Effective Heat of Combustion individual results for sample.

Test	ΔH_c [kJ g^-1]
35 kW m^-2 (Test 1)	34.39
35 kW m^-2 (Test 2)	29.93
50 kW m^-2 (Test 1)	34.29
50 kW m^-2 (Test 2)	34
60 kW m^-2 (Test 1)	33.88
60 kW m^-2 (Test 2)	32.90
80 kW m^-2 (Test 1)	-
80 kW m^-2 (Test 2)	-
Average	33.23
Std dev	1.70

F. Flame Spread

Table 11. Minimum heat flux for flame spread rate and minimum flame spread rate for sample.

Orientation	q̇″_min.spread [kW m^-2]	V_f.min [mm s^-1]
Horizontal	17	1.20
Vertical	7	3

Figure 9. Lateral flame spread rate versus heat flux.

Figure 10. Vertical flame spread rate versus heat flux.

Figure 11. V_f^-1/2 as function of q̇″_ext in horizontal configuration.

Figure 12. V_f^-1/2 as function of q̇″_ext in vertical configuration.

Table 12. Flame spread parameter results for sample.

Orientation	Trial	(^kρc_p⁄_Φh²)^¹⁄₂ [m^³⁄₂ s^¹⁄₂ kW^-1]	Φ [kW² m^-3]
Horizontal	1	1.353	70.03
Horizontal	2	-	-
Vertical	1	-	1000
Vertical	2	-	-