Durez® 33183 is an unmodified thermoplastic phenolic resin of the novolac type. It requires the addition of a curing agent s.a. hexamethylenetetramine to give it thermosetting properties. Durez® 33183 is supplied in pastille form. Durez® 33183 is a general purpose phenolic resin. It is used in all kinds of binding systems where durability and heat resistance are the most important criteria.