Types of gear oils

Types of gear oils :-

– Rust and oxidation preventive gear oils

Rust and oxidation preventive (R&O) oils are mainly mineral base. They contain rust and oxidation inhibitors. The viscosity of R&O oils according to the ISO grading system is between 32 to 320.

– Compounded gear oils

Compounded oils are mineral base. They contain rust and oxidation inhibitors, demulsifiers and up to 10% of fatty oils for better lubricity. Compounded oils are used mainly in worm gears. The viscosity of compounded oils according to the ISO grading system is between 460 to 1000.

– Extreme Pressure (EP) gear oils

EP oils may be either mineral or synthetic base. They contain EP additives, rust and oxidation inhibitors, anti-foaming agents and demulsifiers. The viscosity of EP oils according to the ISO grading system is between 68 to 1500.

– Synthetic gear oils

Synthetic gear oils may be based on polyalphaolefins (PAO), esters oils or polyglycols. They may contain EP additives, rust and oxidation inhibitors, anti-foaming agents and demulsifiers. The viscosity of synthetic oils according to the ISO grading system is between 32 to 6800. Synthetic gear oils are used for gears operating under extreme conditions: very low or very high temperatures, high pressures.