Polyol Ester Vs Diester

Polyol Ester Vs Diester

Modern synthetic esters can be "tuned" to perform in nearly any environment and application.polyol ester vs diester They are derived from carboxylic acids and alcohols, two common chemical building blocks that offer almost unlimited structural and performance possibilities. They can be designed to provide high lubricity, low temperature performance, extreme hydrolytic stability, oxidative stability, biodegradability, and more. The key is working with a supplier that understands the science of ester production and is willing to take the time to identify and evaluate your specific lubrication requirements.

Polyol Ester

Polyol esters (POE) are a class of synthetic base oils produced by the reaction of a polyol with monocarboxylic acid.polyol ester vs diester They are the most popular of all ester base oils and can be used alone or blended with other types of base oil to create high-performance lubricants. They are characterised by a relatively linear molecular structure and excellent low-temperature flow properties. They also exhibit excellent miscibility with HFC refrigerants such as R-134a.

They can be used in a variety of applications, but are particularly well-suited to use as the base oil for low-temperature systems.polyol ester vs diester Their very low pour point and good vapor pressure mean that they can be easily circulated through low-temperature evaporators, allowing them to evaporate quickly without producing undesirable residues such as varnish or deposits. They can also withstand the high temperatures at compressor discharge end and coexist stably over long periods with refrigerants of varying chemical reactivity, including HFOs.

Unlike other synthetic ester products, POEs are non-toxic and do not contain aromatic compounds.polyol ester vs diester They are also very sensitive to moisture, and must be stored in a dry location to prevent water ingress. In addition, POEs are not as stable to oxidation as other synthetic base oils. This can lead to degradation products such as oxidatively-degraded asphaltenes and fatty acids, which are known to form deposits and varnish in lubricant systems.

The good news is that a few simple steps can help to mitigate these concerns and protect the investment in your equipment and lubricant formulations. By storing the product in a dry place, avoiding contamination with atmospheric moisture, and keeping the oil temperature as high as possible when in operation, it is possible to avoid these issues.

In addition, a careful evaluation of the initial acid value of the product is also very important. This is a direct indicator of the precision with which the product is manufactured. A lower acid value indicates better quality and a reduced risk of deterioration.

In general, the higher the acid value, the more likely it is that the product will degrade and produce oxidatively-degradative by-products such as asphaltenes and fatty acids. To ensure that this is not a concern, it is recommended that the manufacturer test the product for asphaltenes and fatty acids during production to verify the absence of these compounds.

For more technical details, please check our Synthetic ester FAQ