Introduction to Ester

Synthetic ester oils offer outstanding lubricity and excellent load carrying characteristics; ester oils are ideal for metal on metal wear prevention and so are often chosen for high speed metal gear applications. Esters are the reaction products of acids and alcohols; there are three basic types which are normally classified first by the alcohol followed by the type of acid. Ester summary:

Temperature range of -60 to 150°C
Affinity to metal/polarity of molecule – attracts to metal surfaces, providing a lubricious film
Excellent load carrying capability/wear reduction
Esters can have plastic and elastomer compatibility problems, particularly with ABS and PC so read our compatibility article for more guidance.
Hydrolytic stability is an issue under certain conditions
Viscosity Index 75 to 190

Keep in mind that if an Ester is used as the base oil for a grease, the thickener and additives also used in the formula will have an influence on the final characteristics and performance of the finished grease/lubricant.

Take a look at our typical thickener systems characteristics used to make a base oil into a grease.

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