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 POE Refrigeration Oil RL 32H

Description

Company Interduction:

Qishanr is the world’s leading supplier of synthetic lubricants to the refrigeration and air conditioning industry. We combine technically superior products and services from our industry-leading divisions and brandsand make every effort to create the best compressors for refrigeration and air-conditioning as well as more efficientmaintenance machines in the HAVC field.Our products have been spreadly exported to 100 countries and regions, such as EU, North America,Latin America, OceaniaMiddle East, South East Asia, Africa, etc. and got a good reputation among new and regular clients.

Specification:

Analysis	Method	RL32H
Vscosity@40℃（cST）	ASTMD445	30.5
Vscosity@100℃（cST）	ASTMD445	5.8
Viscosity Index	ASTMD2270	121
Pour Point (℃)	ASTMD97	-46
Density @20℃ (g/ml)	ASTMD1298	0.977
Flash Point COC (℃)	ASTMD92	258
Acid Value (mg KOH/g)	ASTMD974	<0.05

Product use：

The Emkarate® RL range are synthetic polyol esters (POE) lubricants formulated specifically for use in refrigeration and air-conditioning compressors using HFC refrigerants. These products provide effective wear protection for bearing surfaces, increased system life and improved efficiency, and are suitable for both initial fill and service fill. The combination of low temperature characteristics and unparalleled chemical and thermal stability enable the use of Emkarate® RL products over wide operating temperature ranges.