Table 1.

Physical and fire related properties of some commercial polymers [28].

Properties	Unit	PLA	PET	PA6	PP
Density	g/cm3	1.24	1.38	1.14	0.92
Melting temperature	°C	170–180	255–260	210–220	155–165
Glass transition temperature	°C	55–60	70–80	57–65	−10
Time to ignition	s	58	46	48	42
Smoke generation	m2/kg	63	394	195	142
Limiting oxygen index	%	24	19	18	20
Peak heat release rate	kW/m2	425–450	625–640	575–590	495–510
Effective heat of combustion	kJ/g	18	24	19	21

PLA = polylactic acid; PET = polyethylene terephthalate; PA = polyamide; PP = polypropylene.