Mobil SHC Aware ST 220
Mobil SHC Aware ST 220 is a high-performance emulsifying stern tube lubricant developed for marine stern tube systems operating in environmentally sensitive areas. It meets U.S. Environmental Protection Agency (EPA) 2013 Vessel General Permit (VGP) requirements for environmentally acceptable lubricants. The formulation readily emulsifies with seawater to form a stable water-in-oil emulsion that provides adhesive lubrication and dependable protection under severe marine operating conditions.
One of the key advantages of Mobil SHC Aware ST 220 is its ability to operate effectively in the presence of water. The lubricant forms a stable lubricating film even when seawater ingress occurs, helping maintain lubrication performance and corrosion protection. The emulsifying properties allow the product to safely run with water contamination, reducing the risk of equipment damage and maintaining reliable stern tube operation.
Mobil SHC Aware ST 220 also provides excellent load-carrying capability and strong rust protection. The formulation helps protect bearings, shafts and stern tube components from wear and corrosion, contributing to longer equipment life and reduced maintenance requirements. Its adhesive lubricating film resists water washout, ensuring consistent protection under demanding marine conditions.
Another important benefit is its compatibility with most conventional mineral oil stern tube lubricants. This helps simplify conversion and reduces flushing requirements. Mobil SHC Aware ST 220 also offers good elastomer compatibility, supporting reliable seal performance and helping minimise leakage. In addition, the product can provide effective leak control in some cases where seal damage occurs.
Mobil SHC Aware ST 220 is recommended for marine stern tube systems, fin stabilisers and certain controllable pitch propeller systems where leaks or spills could result in environmental impact. It is also suitable for marine and mobile equipment operating in environmentally sensitive areas and for circulation systems operating under mild to moderate service conditions.
Physical characteristics include ISO VG 220 viscosity grade with a kinematic viscosity of approximately 220 mm²/s at 40°C and 33.3 mm²/s at 100°C. Mobil SHC Aware ST 220 has a viscosity index of approximately 200, a flash point of approximately 163°C and a pour point of approximately −12°C. The product also provides excellent corrosion protection in seawater and stable emulsifying performance, supporting reliable long-term lubrication of marine stern tube systems.
