Emkarate RL32H is an ISO VG 32 synthetic polyol ester (POE) lubricant specifically formulated for HFC refrigerants including R404A, R507, and R134a. Its critical performance characteristic lies in low-temperature fluidity.
According to the product technical data sheet, Emkarate RL32H achieves a pour point of -46°C to -55°C. This specification ensures that under extremely low evaporating temperature conditions, the lubricant maintains adequate flow characteristics, effectively preventing start-up failure or start-up wear caused by excessive viscosity.
In low-temperature systems, oil return efficiency directly impacts evaporator heat exchange performance and compressor lubrication safety. Emkarate RL32H maintains a limited viscosity increase at low temperatures, ensuring that the lubricant returns smoothly to the compressor with the refrigerant, preventing oil retention within the evaporator. This characteristic is particularly critical for systems with long or complex piping layouts.
Low-temperature operation is often accompanied by system uncertainties such as varying start-up frequencies and load fluctuations. Emkarate RL32H maintains excellent chemical stability through tightly controlled specifications — typical moisture content below 50 ppm and total acid number (TAN) below 0.05 mg KOH/g. This minimizes the risk of hydrolysis and acid corrosion during low-temperature and subsequent thermal cycles.
In practical engineering applications, Emkarate RL32H is listed as a recommended lubricant by multiple major compressor manufacturers, including Copeland, Bitzer, and Carrier. When replacing or replenishing lubricant, mixing with other types or brands should be strictly avoided to maintain system performance consistency.
Original publication. This article, “Lubrication Challenges in Low-Temperature Operation: A Technical Response with Emkarate RL32H Synthetic Oil”, was originally published by QishanrLubricants on 2026-04-22 at qishanrlubricants.com. © 2026 QishanrLubricants. All rights reserved.
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