Phosphite Compound

Phosphite EP/AW Additives are oil‑soluble lubricant additives manufactured by Fanschem. Including alkyl phosphite, aryl phosphite and low‑phosphorus customized variants, these liquid‑state additives build robust anti‑wear adsorption layers on metal contact surfaces under extreme‑pressure circumstances, lowering metal‑to‑metal contact friction and preventing surface scoring, seizure and abrasive wear. They possess favourable thermal‑oxidative stability, mild corrosiveness toward non‑ferrous metals and splendid compatibility with friction modifiers, rust inhibitors and other lubricant components. Widely utilised in automotive gear oils, metal‑working fluids, industrial gear lubricants, hydraulic oils and heavy‑duty machinery greases, Fanschem supplies adaptable product grades to comply with international harsh‑service lubricant standards, with dependable bulk‑scale delivery and seasoned formulation assistance for global‑wide lubricant suppliers.

What Are Phosphite EP/AW Additives?

Phosphite EP/AW Additives are ashless phosphite ester-based lubricant functional additives designed to deliver extreme pressure and anti-wear protection under heavy-load boundary lubrication conditions. Different from conventional sulfur-phosphorus EP additives with high phosphorus content, Fanschem phosphite compound series includes Dibutyl phosphite T304, Dilauryl hydrogen phosphite PSAIL 3012 and Dioleyl hydrogen phosphite PSAIL 3018, all featuring low-phosphorus eco-friendly liquid structure. When exposed to friction and high pressure, phosphite molecules decompose and adsorb onto metal surfaces to form dense phosphorus-containing tribofilms, which effectively isolate metal contact and reduce abrasion, scoring and seizure of steel workpieces and mechanical parts. These multifunctional additives also bring obvious synergistic antioxidant performance, widely favored by global lubricant formulators as low-phosphorus EP raw materials for industrial and automotive lubricant formulas.

Core Performance & Key Features of Phosphite EP/AW Additives

Extreme Pressure & Anti-Wear Performance

All Fanschem phosphite additives show outstanding load-bearing capacity under harsh heavy-duty working conditions. The generated phosphorus protective film can bear instant impact load and continuous high friction, significantly lowering wear loss of gear sets, hydraulic plungers and metal processing workpieces. It effectively prevents metal scratch, pitting and sticking failure caused by insufficient lubrication.

Ashless Formula & Antioxidant Synergism

The whole product line adopts ashless molecular design without metal ash residue, matching low-phosphorus, low-emission lubricant development trends. Phosphite ester can decompose peroxide free radicals inside oil products, cooperating with amine and phenolic antioxidants to slow base oil oxidation and extend service cycle of circulating lubricants. All three models are transparent liquids with excellent miscibility with mineral oil, synthetic ester and PAO base stocks, no sedimentation after long-term storage.

Technical Advantages Over Traditional Sulfur-Phosphorus EP Agents

Compared with traditional high-phosphorus sulfurized EP anti-wear agents, Fanschem phosphite EP/AW additives have prominent comprehensive technical strengths. The low-phosphorus ashless molecular structure complies with global low-P emission limits, avoiding catalyst blockage risks in vehicle exhaust systems. It produces mild corrosion to copper and yellow metals without severe discoloration, solving the copper corrosion defect of traditional sulfur-phosphorus agents. The liquid phosphite products have perfect compatibility with organic molybdenum friction modifiers, metal deactivators and dispersants, without chemical antagonism. Under medium and low temperature load conditions, its anti-wear efficiency exceeds conventional sulfur-phosphorus additives, and it will not generate excessive acidic byproducts to corrode equipment pipelines during long-term operation. In addition, lower effective dosage helps lubricant manufacturers cut overall formulation cost.

Main Applications of Phosphite EP/AW Lubricant Additives

Fanschem phosphite compound series is widely applicable to various automotive and industrial lubricant blending scenarios. For automotive lubrication, it can be added into low-phosphorus gear oil and general industrial engine oil to improve gear wear resistance. For industrial lubricants, it serves as core EP additive for heavy-duty hydraulic oil, circulating compressor oil and long-service industrial grease. It is the preferred multifunctional additive for environmental friendly metal working fluids including cutting oil, drawing oil and stamping fluid. Besides, it fits all kinds of low-phosphorus low-SAPS lubricant systems that restrict high sulfur and high phosphorus content, suitable for construction, mining and agricultural machinery lubrication circuits with medium load requirements.

Technical Specifications & Product Parameters

Fanschem provides three mature industrial-grade phosphite EP/AW additives with adjustable technical indicators to meet customized formulation demands. Dibutyl phosphite T304 (CAS 1809-19-4) is short-chain phosphite ester with strong extreme pressure performance, widely used in general metal working fluids and low-cost industrial oils. Dilauryl hydrogen phosphite PSAIL 3012 is long-chain ashless eco-grade product, featuring balanced anti-wear and antioxidant capacity for circulating hydraulic oil and compressor oil. Dioleyl hydrogen phosphite PSAIL 3018 (CAS 64051-29-2) adopts long oleyl alkyl chain, with better oil solubility and high-temperature stability, ideal for high-grade metal forming lubricants. All products support custom adjustment of phosphorus content, kinematic viscosity and flash point according to customer formula standards.

Phosphite EP/AW Additives Manufacturer Strength

As a professional full-series lubricant additive manufacturer, Fanschem phosphite ester products gain stable recognition from lubricant factories and blenders all over the world. We own a complete phosphite product portfolio covering short-chain, medium long-chain and oleyl long-chain grades to satisfy all low-phosphorus EP formulation needs. Strict raw material inspection and full-index finished product testing realize consistent batch performance without fluctuation. All products pass international environmental and safety certification standards to support cross-border export business. Independent R&D laboratory continuously optimizes alkyl chain molecular structure to keep pace with low-phosphorus green lubricant market trends. Factory direct supply removes intermediate distributors, with sufficient permanent inventory to support continuous mass orders from global clients.

Custom Formulation Solutions & Global Bulk Supply Service

Fanschem delivers one-stop supporting service for global lubricant manufacturers, distributors and formulators purchasing phosphite EP/AW additives. We offer full OEM & ODM customization, including adjustable phosphorus content, molecular alkyl chain length and personalized private label packaging specifications. Multiple flexible packaging options are available: small trial barrels for lab formula test, standard metal drums for medium batch production and IBC bulk tanks for large-scale industrial orders. Professional technical team provides targeted dosage guidance, additive compatibility test data and complete extreme pressure anti-wear tribology reports to assist formula debugging. We reply to all quotation inquiries quickly within working hours and cooperate with reliable cross-border logistics providers to ensure on-time stable delivery of bulk phosphite additive orders worldwide.