Comparison of Pentaerythrotol and Its Derivatives as Intumescent Flame Retardants for Polypropylene

Table 1

Effect of different ratios of APP to PBPP on flame retardancy of PP.

PP (g)	APP (g)	PBPP (g)	UL-94
100	0	0	V-2
75	25	0	V-2
75	20	5	V-1
75	15	10	V-0
75	10	15	V-0
75	5	20	V-2
75	0	25	V-2