Calcium petroleum sulfonate

Calcium petroleum sulfonate (CAS 61789-86-4), also known as oil-soluble petroleum sulfonate calcium salt, is a metal sulfonate derived from petroleum refining used as a corrosion inhibitor.

Where is Calcium petroleum sulfonate used?

• Lubricants: emulsifier and detergent additive in industrial lubricant and fuel systems
• Metalworking fluids and rust preventive oils: forms protective films on ferrous metal surfaces, reducing corrosion during storage, transit, and machining
• Engine oils, gear oils, and greases: detergent-dispersant that neutralizes acidic by-products and keeps metal surfaces clean under high-temperature conditions
• Oil and gas: emulsifier in drilling fluids and pipeline corrosion inhibitor packages, ensuring infrastructure integrity during extraction and transport
• Automotive aftermarket: rust-proofing compounds and underbody coatings for long-term metal protection
• It is a direct candidate for formulations where water-based alternatives are incompatible.

Good to know: Overbased grades are standard for engine oil additive applications, while neutral grades suit rust preventive uses.

Commercial specifications

• Overbased and neutral grades, distinguished by Total Base Number (TBN)