SEBS
Styrene-Ethylene-Butylene-Styrene
Glass Transition (Tg)
-55 (EB) / 100 (PS)
Melting Point (Tm)
—
Density
0.90 g/cm³
CAS Number
66070-58-4
Recycling Code
♺ 7
Category
Elastomer
Repeat Unit
–[CH₂–CH(C₆H₅)]ₐ–[CH₂–CH₂–CH₂–CH(C₂H₅)]_b–[CH₂–CH(C₆H₅)]ₐ–
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
Hydrogenating the butadiene block removes double bonds, giving excellent UV, ozone and thermal stability; widely used as a compatibiliser.
Applications
Soft-touch overmoulding, medical tubing, PP impact modification, cable jackets.