Styrene-Butadiene (SBR) Viscosity Index Improver

Name: Styrene-Butadiene (SBR) Viscosity Index Improver
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 9003-55-8

Styrene-butadiene (SBR) block copolymers are versatile viscosity index improvers used in automatic transmission fluids, power steering fluids, and hydraulic oils where both low-temperature fluidity and high-temperature viscosity retention are critical. The star-polymer architecture provides excellent low-temperature performance while the high molecular weight ensures effective thickening. Hydrogenated grades offer improved oxidative stability for applications requiring extended service life.

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Technical Specifications

appearance	Amber to dark amber viscous liquid
styrene content	20–40 wt%
flash point (COC)	>175 °C
molecular weight (Mw)	80,000–200,000 Da
shear stability index (SSI)	5–25
active content in solvent/diluent	15–30 wt%

Applications

Automatic transmission fluids (ATF) for improved cold-start and high-temperature performance
Power steering fluids and electric power steering fluids
Hydraulic fluids with wide operating temperature range requirements
Industrial multi-grade gear and circulation oils
Farm tractor universal fluids (UTTO/STOU)

Key Features

Star-polymer architecture delivers excellent low-temperature viscometric performance in ATF applications
Good shear stability (low SSI) maintains viscosity through transmission service life
Compatible with a wide range of ATF friction modifiers and base oil types
Hydrogenated grades available for improved oxidative and thermal stability in demanding applications