Sulfurized Olefin Extreme Pressure Additive

Name: Sulfurized Olefin Extreme Pressure Additive
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 68952-81-8

Sulfurized olefins are reactive sulfur-containing extreme pressure (EP) additives produced by the reaction of olefins with elemental sulfur or sulfur chlorides. They form iron sulfide protective films at asperity contact points under high-load gear and bearing contacts, preventing scuffing and welding. Available in active and inactive sulfur variants, they are core components in GL-4/GL-5 gear oils and heavy-duty industrial lubricants.

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Technical Specifications

appearance	Dark amber to dark brown liquid
4-ball weld load	>250 kgf
flash point (COC)	>120 °C
total sulfur content	30–50 wt%
active sulfur content	20–40 wt%
kinematic viscosity (100°C)	5–20 mm²/s

Applications

Automotive gear oils (GL-4, GL-5) for manual transmissions and axles
Industrial gear oils (ISO VG 68–680) for enclosed gearboxes
Metalworking and cutting fluids requiring extreme pressure protection
Compressor oils operating under high discharge pressure
Chain oils and open gear lubricants in harsh industrial environments

Key Features

High active sulfur content delivers excellent scuffing and welding protection under shock loads
Reacts with iron surfaces to form a sacrificial sulfide film that prevents metal-to-metal contact
Available in both thermally active and inactive forms for corrosion-sensitive applications
Cost-effective EP component readily combined with phosphorus-based antiwear additives