Sulfurized isobutylene

Sulfurized isobutylene (CAS 68511-50-2) is an organosulfur additive used to enhance the extreme-pressure and anti-wear performance of lubricant formulations.

Where is Sulfurized isobutylene used?

• Gear oils, hydraulic fluids and metalworking fluids: extreme-pressure protection during heavy-load machining
• Cutting and forming operations where conventional additives fail
• Grease formulations for industrial and automotive applications: extends component life in high-temperature environments, including CV joints and open gears
• Engine oil additive packages and transmission fluids: oxidation control and boundary lubrication together
• Oil and gas: protects drilling fluid systems and downhole equipment under severe mechanical stress
• It forms a protective sulfide film on metal surfaces.

Good to know: Active grades offer higher EP performance while inactive grades are preferred where corrosion to copper alloys must be controlled.

Commercial specifications

• Active sulfur content grades from approximately 40% to over 50% sulfur by weight
• Active and inactive sulfur variants