What type of refrigeration oil should I use for my screw compressor?

Screw compressors typically require POE (Polyol Ester) oils for HFC refrigerants like R134a and R407C, or mineral oils for HCFC systems like R22. The viscosity grade (usually ISO VG 32-68) depends on the compressor manufacturer's specifications. Brands like Bitzer recommend BSE series POE oils, while FUSHENG systems often use mineral oil formulations.

What is the difference between POE and mineral refrigeration oil?

POE (Polyol Ester) oils are synthetic lubricants designed for HFC refrigerants (R134a, R404A, R407C, R410A) and are hygroscopic, requiring careful moisture control. Mineral oils (MO) are petroleum-based, used with CFC and HCFC refrigerants (R22, R502), and are less expensive but incompatible with modern HFC systems. POE oils offer better thermal stability and miscibility with newer refrigerants.

How do I select the right refrigeration oil for a centrifugal chiller?

For centrifugal chillers, select oil based on the OEM specification (e.g., Trane OIL00037, York PureOil S), the refrigerant type (R123 low-pressure or R134a medium-pressure), and the required viscosity grade. Most modern centrifugal chillers use POE oils with ISO VG 32-68. Always verify compatibility with the chiller manufacturer's technical bulletin and ensure the oil meets the required pour point for your operating conditions.

Emkarate RL220H Refrigeration Oil

By Qishanr Lubricants December 18th, 2025 66 views

Strong Wear Resistance, Extending System Life:

As an ISO VG 220 grade synthetic polyol ester (POE) refrigeration oil, it can form a stable oil film on the surface of steel and aluminum components. Test data shows that its viscosity at 40℃ reaches 215cSt, viscosity at 100℃ is 18.8cSt, and viscosity index is 98, which can maintain lubrication stability in a wide temperature range and effectively reduce compressor component wear.
Easy Startup at Low Temperature, Stable Operation at High Temperature:

To address the problem of difficult low-temperature startup, its pour point is as low as -25℃ (ASTM D97 standard), enabling rapid flow even in harsh cold environments and avoiding dry friction damage during cold startup; it has excellent thermal stability, with a high flash point of 280℃ (ASTM D92 standard) ensuring no coking or degradation at high temperatures. Combined with a low acid value of <0.05mg KOH/g (ASTM D974 standard), it reduces system corrosion and maintenance frequency.
Wide Compatibility and Strong Adaptability:

Whether for initial installation and commissioning or later maintenance, it is perfectly compatible with mainstream HFC refrigerants such as R134a and R404A, and suitable for various types of refrigeration compressors, without the need for additional adjustment of system parameters.