Sulfur-Based EP/AW Additive

What Are Sulfur-Based EP/AW Additives?

Sulfur-Based EP/AW Additives are sulfur-containing lubricant functional additives with polysulfide, sulfurized olefin and dithiocarbamate molecular structures, designed to deliver ultra-high extreme pressure protection under heavy load, high-speed metal cutting and metal forming conditions. Different from phosphorus-only anti-wear additives with limited load capacity, Fanschem full sulfur additive portfolio covers seven mature grades including PSAIL PS32, PSAIL PS20, PSAIL T323A, PSAIL 3540, PSAIL 3317, PSAIL 3515 and PSAIL PS44. Under intense frictional heat and contact pressure, sulfur elements in molecules react rapidly with ferrous metal surfaces to form iron sulfide protective films with strong shear resistance. This sulfide barrier can bear instant heavy impact load, effectively avoid metal welding, scratching and seizure during harsh metal processing. By adjusting molecular sulfur activity, these additives can match formulas with or without copper alloy parts, and they show good miscibility with various base oils. Sulfur-based EP additives have become the core raw material for heavy-duty metal working fluids widely adopted by global lubricant formulators.

Core Performance & Key Features of Sulfur-Based EP/AW Additives

High Active Sulfur Extreme Pressure Performance

High-activity sulfur varieties such as PSAIL PS32 and PSAIL 3540 release sulfur quickly under frictional high temperature, generating thick, tough iron sulfide tribofilms to withstand ultra-heavy stamping, forging and cutting loads. The film structure will not crack or peel under continuous high shear force, significantly reducing workpiece surface abrasion and tool loss. They maintain stable extreme pressure performance even under dry or semi-dry metal processing environments lacking sufficient liquid lubrication.

Adjustable Sulfur Activity & Multi-Functional Synergy

The whole product line supports adjustable sulfur activity from low inactive to high active grades to meet different metal processing demands. Low-activity polysulfide like PSAIL PS20 and PSAIL PS40 bring mild corrosion to copper alloys, suitable for formulas containing brass or bronze components. Ashless dialkyl dithiocarbamate PSAIL T323A integrates extreme pressure, anti-wear and antioxidant effects at the same time. All sulfurized products are transparent liquid with excellent solubility in mineral oil, synthetic ester and PAO, no sediment after long-term low-temperature storage.

Technical Advantages Over Phosphorus EP Additives

Compared with single phosphorus extreme pressure additives, Fanschem sulfur-based EP additives possess outstanding load-bearing superiority for heavy metal working scenarios. Iron sulfide film formed by sulfur components has far better shear resistance than phosphorus tribofilm, suitable for deep drawing, heavy stamping and high-speed cutting that phosphorus agents cannot support. The diversified sulfur activity series realizes targeted matching for iron-only workpieces or yellow metal mixed systems, solving the copper corrosion defect of high-active sulfur products. Sulfurized olefin and sulfurized ester products have good compound compatibility with phosphate, phosphite and metal deactivators without chemical antagonism. They will not produce phosphorus-related sediment to block equipment filters, and lower dosage can reach ideal heavy-load lubrication effect to control formulation cost.

Main Applications of Sulfur-Based Lubricant Additives

Fanschem sulfur additive series covers full industrial lubrication and metal processing scenarios. High-active polysulfide and sulfurized olefin products are mainly used in heavy-duty cutting oil, stamping fluid, forging lubricant and deep drawing oil for steel, iron and alloy workpieces. Low-inactive sulfur grades can be added into general industrial gear oil and multi-purpose hydraulic oil that need to protect copper alloy parts. Ashless PSAIL T323A is widely compounded into industrial grease and circulating compressor oil to balance EP and anti-oxidation demands. Sulfurized fatty ester blends fit low-odor forming oil formulas for precision machinery processing, applicable to construction machinery, mining equipment heavy-load lubrication circuits without high requirements for copper protection.

Technical Specifications & Product Parameters

Fanschem supplies seven mature industrial-grade sulfur-based EP/AW additives with customizable physicochemical indicators to fit personalized formulation standards. PSAIL PS32 is high-active tertiary dodecyl polysulfide for heavy-duty iron cutting fluids. PSAIL PS20 is long-chain inactive alkyl polysulfide with low copper corrosion. PSAIL T323A ashless dialkyl dithiocarbamate integrates EP, anti-wear and antioxidant functions. PSAIL 3540 high-active sulfurized olefin features fast sulfur release and stable low-temperature EP performance. PSAIL 3317 sulfurized fatty acid ester provides good surface lubricity for precision forming. PSAIL 3515 mixed sulfurized ester & olefin balances activity and oil solubility. PSAIL PS44 di-tert-butyl alkyl polysulfide owns stable thermal decomposition performance. Clients can adjust total sulfur content, sulfur activity, kinematic viscosity and flash point as required.

Sulfur-Based EP/AW Additives Manufacturer Strength

As a professional full-range lubricant additive manufacturer, Fanschem sulfur series obtains stable recognition from global metalworking fluid factories and lubricant blenders. We build a complete product matrix covering high-active, low-inactive, sulfurized olefin, sulfurized ester and dithiocarbamate types to satisfy all heavy-load sulfur EP formulation needs. Strict whole-process quality control including raw material inspection and finished full-index testing ensures consistent performance of each batch. All products meet international industrial safety and export environmental standards. Independent R&D laboratory continuously optimizes sulfur molecular structure to balance extreme pressure capacity and copper corrosion performance. Factory direct sales cut intermediate costs with abundant permanent inventory to support continuous global bulk orders.

Custom Formulation Solutions & Global Bulk Supply Service

Fanschem provides one-stop supporting service for worldwide lubricant manufacturers, metalworking fluid producers and distributors purchasing sulfur-based EP additives. Full OEM and ODM customization is available, including adjustment of total sulfur content, sulfur activity and private label packaging specifications. Flexible multiple packaging options include small lab trial barrels, standard metal drums and large IBC tanks for small test batches and mass industrial production. Professional technical team provides targeted dosage guidance, additive compatibility test data and complete extreme pressure tribology test reports to accelerate formula debugging. We respond to all quotation inquiries promptly during working hours and cooperate with reliable cross-border logistics providers to guarantee on-time, safe delivery of bulk sulfur additive orders to all regions worldwide.