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Is your lubricant fit to withstand the long-term challenges inherent with carbon dioxide (CO2) refrigeration system operation?

March 04, 2020

Summit RPE-744 Series

With any refrigeration system, proper oil selection is key to providing proper long-term compressor protection and to ensure this equipment runs at maximum efficiency.  The harsh conditions within CO2 applications require the use of wax-free synthetic lubricants, and while several synthetic base oil solutions are available, each faces unique challenges relative to oil management.

Polyol ester (POE) base oil products are often the solution because they offer the advantage of superior miscibility with CO2, which provides simplistic oil return management.  The major concern with POE-based lubricants is that they are highly hygroscopic, which means they seek to absorb moisture from their surroundings. 

Water in any amount can be detrimental to a closed loop CO2 system as ice formation can damage valves and lead to system failure.  Excessive water promotes additional risk of hydrolysis, a chemical reaction that breaks down the POE oil and leads to the formation of highly corrosive carbonic acid.  

In a perfect scenario, a system would be free of all contaminants including moisture, but this simply isn’t realistic. 

“While it’s important to minimize the amount of moisture that starts in your POE lubricant, the moment you open the lid to your oil, the POE lubricant begins absorbing moisture from the surrounding atmosphere,” said Paige Holder, Summit’s market manager for refrigeration lubricants.  “Regardless of whether absorption of water occurs before, during or after installation, the lubricant must be designed to resist chemical reaction with the water it comes in contact with.”

Summit’s RPE-744 Series are fully synthetic POE lubricants specifically formulated to provide long-life solutions designed to withstand harsh conditions present within CO2 refrigerant applications.  In addition to providing excellent wear protection, the RPE-744 Series offers superior chemical, thermal and hydrolytic stability to protect against product degradation in the presence of contaminants. Summit’s RPE-744 Series also provides superior corrosion protection to protect all metal surfaces from the harmful impact of acid corrosion.

Contact us today to find out more about Summit RPE-744 Series or to ask our experts how our high-quality lubricants can help solve your refrigeration compressor problems.


ISO 9001

Summit first received its ISO 9001 certification in January of 1996, demonstrating a commitment to quality assurance and performance monitoring. ISO 9001 certification is an international quality standard that addresses a comprehensive list of business elements, including management responsibility, order processing, purchasing, process control, traceability, handling of non-conforming product, and internal auditing. Our present ISO 9001 certification is proof of our continuing quality commitment to our customers.


ISO 14001

Summit is committed to protecting the environment, the health and safety of our employees, customers and communities where we work and live. We recognize that through integrating sound environmental health, and safety management practices into all aspects of our business ... we can offer innovative products and services while conserving and enhancing resources for future generations.


NSF ISO 21469

ISO 21469 specifies hygiene requirements for the formulation, manufacture, use and handling of lubricants, which may come into contact with products during manufacturing or processing. The international standard applies to lubricants intended for use in food production, as well as cosmetic, pharmaceutical and animal feed industries. NSF ISO 21469 Certification by an independent, third party provides Summit with a means to obtain international acceptance for their products. 

You can see a list of Summit’s ISO 21469 certified products by clicking here.