Shell Refrigeration Oil S4 FR-F 68
Shell Refrigeration Oil S4 FR-F 68 is a high-performance synthetic refrigeration compressor lubricant formulated using a polyol ester (POE) base fluid. The lubricant has been specifically developed for refrigeration systems operating with HFC refrigerants such as R134a and other modern refrigerant types. Its advanced formulation provides reliable lubrication, excellent wear protection and long oil life, making it suitable for a wide range of refrigeration compressors used in domestic, commercial and industrial cooling systems.
One of the key advantages of Shell Refrigeration Oil S4 FR-F 68 is its excellent resistance to thermal degradation and oxidation. Refrigeration compressors frequently operate under high discharge temperatures that can accelerate lubricant breakdown and lead to deposit formation. The synthetic polyol ester base fluid provides superior thermal stability, allowing the lubricant to maintain performance even under demanding operating conditions. This stability helps reduce sludge and deposit formation within compressor components, contributing to longer oil drain intervals and reduced maintenance requirements.
Shell Refrigeration Oil S4 FR-F 68 also provides excellent protection against wear in critical compressor components. The lubricant is designed to minimise wear in bearings and pistons, which are among the most heavily loaded parts of a reciprocating compressor. By forming a durable lubricating film between metal surfaces, the oil helps reduce friction and mechanical wear, helping extend compressor service life and maintain reliable system operation.
Another important benefit of Shell Refrigeration Oil S4 FR-F 68 is its compatibility with HFC refrigerants and refrigeration system materials. The lubricant is fully miscible with HFC refrigerants across the full range of typical refrigeration operating temperatures. This ensures effective oil circulation and consistent lubrication throughout the refrigeration system. In addition, the oil is compatible with sealing materials commonly used in refrigeration systems designed for HFC refrigerants, helping maintain system integrity and reliability.
Shell Refrigeration Oil S4 FR-F 68 is recommended for use in open, semi-hermetic and hermetic refrigeration compressors used in domestic, commercial and industrial refrigeration installations. It can be used in both rotary and reciprocating compressor designs operating with HFC refrigerants such as R134a. The lubricant meets the requirements of DIN 51503 KD and supports dependable lubrication performance across a wide range of refrigeration operating conditions.
Physical characteristics include a kinematic viscosity of approximately 66 mm²/s at 40°C and 8.8 mm²/s at 100°C. The oil has a density of approximately 991 kg/m³ at 15°C, a flash point of approximately 230°C and a pour point of approximately –42°C, supporting stable lubrication performance across a wide range of refrigeration system operating temperatures.
