TABLE 1.

Types and properties of generally used synthetic plastics.

Plastics	Abbreviation	Structure formula	Tm (°C)a	Tg (°C)b	XC (%)c	Recycling codes
High-density polyethylene	HDPE		200–300	−120	80–90
Low-density polyethylene	LDPE		160–260	−120	45–65
Polystyrene	PS		240	63–112	–
Polypropylene	PP		130	−10–18	60–70
Polyvinyl chloride	PVC		100–260	60–70	–
Polyethylene terephthalate	PET		260	80	40–60
Polyester polyurethane	Polyester PUR		8–20 (soft)	−75 to −50 (soft) 185–205 (hard)	40–50
Polyether polyurethane	Polyether PUR		-95 (soft) 100 (hard)	−10 to 45 (soft) 190–240 (hard)

^aT_m, melting temperature. ^bT_g, glass transition temperature. ^cX_C, crystallinity.