Hydrogenated Styrene-Isoprene (HSD) Viscosity Index Improver

Name: Hydrogenated Styrene-Isoprene (HSD) Viscosity Index Improver
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 9010-79-1

Hydrogenated styrene-diene (HSD) VI improvers are star-structured block copolymers offering superior oxidative stability, excellent low-temperature performance, and high thickening efficiency in a single additive. The hydrogenation step eliminates residual double bonds, greatly improving stability against oxidation and thermal degradation. HSD is the preferred VI improver for premium low-viscosity engine oils (0W-16, 0W-20) and modern transmission fluids that require extreme low-temperature cranking performance.

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Technical Specifications

appearance	Light to dark amber liquid
flash point (COC)	>180 °C
active content in oil	15–25 wt%
molecular weight (Mw)	80,000–180,000 Da
styrene-to-isoprene ratio	20:80 to 40:60 (wt/wt)
shear stability index (SSI)	<15

Applications

Ultra-low-viscosity engine oils (0W-16, 0W-8) for fuel economy improvement
Modern 0W-20 and 5W-30 passenger car motor oils
Automatic and dual-clutch transmission fluids with extreme cold-start requirements
EV and hybrid vehicle transmission fluids
Premium synthetic gear oils (75W-80, 75W-90)

Key Features

Hydrogenated backbone provides superior oxidation resistance versus non-hydrogenated diene copolymers
Star-polymer architecture achieves exceptional low-temperature CCS and MRV viscosity performance
Very low SSI ensures excellent shear stability over long drain intervals in premium engine oils
Enables ultra-low-viscosity SAE grade formulations while maintaining adequate HT/HS viscosity