Synergistic Flame Retardancy of Aluminium Dipropylphosphinate and Melamine in Polyamide 6

Table 2

Effect of the loading of flame retardants on its flame retardance in PA6.

𝑤 (ME) : 𝑤 (ADPP)	Loading/%	LOI/%	UL 94 class	Combustion phenomenon
0 : 100	0	22.5	—	Sustained combustion, drips
	5	26.8	—	Sustained combustion, drips
	10	29.8	FV-1	Gentle combustion, self-extinguishing, no drips
	15	30.7	FV-0	Difficult ignition, self-extinguishing, no drips
	20	32.2	FV-0	Difficult ignition, self-extinguishing, no drips
	25	33.2	FV-0	Difficult ignition, self-extinguishing, no drips
25 : 75	5	28.7	—	Sustained combustion, drips
	10	30.9	FV-0	Difficult ignition, self-extinguishing, no drips
	15	31.8	FV-0	Difficult ignition, self-extinguishing, no drips
	20	34.7	FV-0	Difficult ignition, self-extinguishing, no drips
	25	36.3	FV-0	Difficult ignition, self-extinguishing, no drips
75 : 25	5	28.0	—	Sustained combustion, drips
	10	28.8	—	Sustained combustion, drips
	15	29.8	—	Sustained combustion, drips
	20	30.3	FV-1	Gentle combustion, self-extinguishing, no drips
	25	34.0	FV-0	Difficult ignition, self-extinguishing, no drips
100 : 0	5	23.5	—	Sustained combustion, drips
	10	24.1	—	Sustained combustion, drips
	15	26.7	—	Sustained combustion, drips
	20	27.6	—	Sustained combustion, drips
	25	28.3	—	Sustained combustion, drips