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.

Suniso Synthetic Refrigeration Oils

By Qishanr Lubricants August 26th, 2025 79 views

SUNISO SL RANGE

SL22, SL32, SL46, SL68, SL100, SL170, SL220

Suniso SL synthetic refrigeration oils are formulated with select polyol ester based stocks and additives, providing outstanding lubrication, stability and corrosion protection. Suniso SL oils are miscible with HFC refrigerants at extremely low temperatures. Suitable for use in compressors of refrigeration and air conditioning systems, working on ozone friendly alternative coolants.

Parameters

	SL22	SL32	SL46	SL68	SL100	SL170	SL220
density at 15°C	0.990	0.980	0.970	0.960	0.960	0.990	0.990
viscosity at 40°C	22.0 cSt	32.0 cSt	47.2 cSt	70.1 cSt	100 cSt	170 cSt	220 cSt
viscosity at 100°C	4.6 cSt	5.8 cSt	7.2 cSt	9.1 cSt	11.3 cSt	17.2 cSt	20.8 cSt
viscosity index	127	125	112	105	100	109	111
flash point	232°C	235°C	235°C	252°C	254°C	260°C	264°C
pour point	-48°C	-48°C	-44°C	-36°C	-36°C	-24°C	-30°C
colour	L 0.5	L 0.5	L 0.5	L 0.5	L 0.5	L 0.5	L 0.5
water	< 100 ppm	< 100 ppm	< 100 ppm	< 100 ppm	< 100 ppm	< 100 ppm	< 100 ppm