SN series

The SN series is a family of solid lubricant additives based on high-purity synthetic Tin (IV) Sulfide (SnS2​). Its main function is to enhance the Extreme Pressure (EP) and Anti-Wear (AW) properties of greases, with a particular advantage in its excellent high-temperature stability. It works by forming a low-shear lubricating film on metal surfaces.

The SN series is a strategically superior choice to MoS2​ in several scenarios:

• High-Temperature Applications: When the grease must operate continuously at elevated temperatures, as $SnS_2$ offers greater thermal stability and oxidation resistance.
• Cost Stability: For formulations seeking to reduce dependency on the price volatility of the Molybdenum market. Tin provides a more predictable cost structure.
• Enhanced EP/AW Performance: When the goal is to exceed the standard performance of $MoS_2$ in load-carrying capacity and wear protection, as demonstrated by Four-Ball testing.

In comparative tests (ASTM D2783 and D4172) on a lithium complex grease with a 3% additive treat rate, the SN series shows significant improvements:

• Weld Point (EP): Reaches 3089 N, notably outperforming the 2452 N of $MoS_2$, which indicates a higher capacity to withstand shock loads.
• Wear Scar (AW): Produces a significantly smaller wear scar (60 mm) compared to $MoS_2$ (0.70 mm), translating to longer component life.

We recommend a treat rate in the range of 3% to 5% by weight of the finished grease. This concentration has proven highly effective in providing an optimal balance between EP/AW performance and formulation cost.

No. Tin Sulfide is a chemically inert solid. This ensures its full compatibility with most base oils (mineral, PAO, esters) and thickener systems (Lithium Complex, Calcium Sulfonate, Polyurea, etc.), allowing for easy integration into new or existing formulations without altering their fundamental properties.