Calumet CalEster base stocks are available in a variety of viscosities for aviation, refrigeration, and industrial applications. Our Group V polyol esters offer excellent thermal stability, compatibility, and are biodegradable. Our CalEster products deliver value where traditional base stocks cannot. With our two pilot lines, we are able to custom design an ester for you! Our CalEster products can be blended with Calumet Group I-III mineral base stocks to enhance properties when higher performance is required.