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
  • Good overall plastic/elastomer compatibility (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.

Newgate Simms online shop