Olefin Copolymer (OCP) Viscosity Index Improver

Name: Olefin Copolymer (OCP) Viscosity Index Improver
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 9010-77-9

Olefin copolymer (OCP) VI improvers, based on ethylene-propylene copolymers, are the most widely used viscosity modifiers in engine oils and gear oils due to their excellent shear stability and cost-effectiveness. They improve the viscosity-temperature relationship to enable multi-grade formulations and demonstrate outstanding mechanical shear stability in service, making them ideal for heavy-duty diesel engine oils that must retain their viscosity grade through long drain intervals.

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Technical Specifications

appearance	Amber viscous liquid or solid pellets
ethylene content	40–60 mol%
flash point (COC)	>200 °C
molecular weight (Mw)	100,000–250,000 Da
active content in diluent	8–12 wt% (solution grade)
shear stability index (SSI)	15–45

Applications

Heavy-duty diesel engine oils (15W-40, 10W-40, 10W-30) requiring shear-stable VI improvement
Passenger car engine oils (5W-30, 5W-40, 10W-40) as cost-effective viscosity modifier
Gear oils and axle lubricants (75W-90, 80W-90, 80W-140)
Industrial transmission oils and multi-purpose tractor fluids (UTTO)
Construction and off-highway equipment engine oils

Key Features

Cost-effective high-molecular-weight VI improvement enables economical multi-grade formulations
Excellent inherent shear stability for sustained viscosity-grade retention over engine life
Available in solid pellet or oil-dissolved forms to suit different blending operations
No pour point depressant capability, but readily combined with PMA PPD for full multi-grade performance