PUR
Polyurethane (Thermoset)
Glass Transition (Tg)
-50 to 100 (tunable)
Melting Point (Tm)
— (crosslinked)
Density
0.03–1.20 g/cm³
CAS Number
9009-54-5
Recycling Code
None
Category
Thermoset
Repeat Unit
–[O–CO–NH–R–NH–CO–O–R′]ₙ–
The repeating unit is the smallest structural fragment whose repetition builds the whole chain. Subscripts show the relative share of each unit in copolymers.
Key Properties
Extraordinarily versatile: formulation controls everything from ultra-soft flexible foam to rigid structural elastomer; water reacts with isocyanate to blow CO₂.
Applications
Mattress and seat foam, building insulation, coatings, wheels.