TPU
Thermoplastic Polyurethane
Glass Transition (Tg)
-40 to 20 °C
Melting Point (Tm)
160–220 °C
Density
1.10–1.25 g/cm³
CAS Number
9009-54-5
Recycling Code
♺ 7
Category
Elastomer
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
Phase-separated block copolymer: hard segments act as physical crosslinks, soft segments give elasticity; outstanding abrasion resistance; polyester grades hydrolyse, polyether grades resist water.
Applications
Shoe soles, phone cases, medical tubing, shape-memory blends, TPU film.