Properties of Ester Oils

Mar 19,2026

Properties of Ester Oils

 

Monoleate esters have very high viscosity indexes but low viscosity.

Diesters have excellent viscosity indexes, biodegradability, and pour points because they have a "dumbbell" structure. Their linear dicarboxylic acid portion has a good viscosity index, while the branched ends result in a low pour point. Furthermore, because the branched portion of the diester is at the end of the linear portion, it still rotates well around the ester chain, giving it excellent viscosity index and pour point. The disadvantage of diesters is their low relative molecular mass, which limits their viscosity range.

Polyol esters have essentially the same advantages and disadvantages as diesters, but they have better biodegradability and thermal stability.

Compound polyol esters offer great flexibility, allowing viscosity to be controlled by the degree of polymerization. Their advantages include good biodegradability, high viscosity index, and relatively low pour point.

Polyesters have high viscosity indexes (140-250), good lubricity, good hydrolytic stability, and good compatibility with mineral oils and commonly used lubricant additives.

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