Polyester wire enamel resin are condensation product of diol or triol components with diacids or their reactive derivatives. The poliesters produced initially by this method, which are sold as wire enamels, are relatively low in molecular weight becouse of an excess of diols. They are sold in mixtures of cresylic solvent and hydrocarbons. The diols used are mainly ethylene glycol and diethilene glycol. triols such as THEIC and glicerine, which have low volatility, are used extensively to achieve a high degree of branching that increase the thermal stability of the cured film. The diacids used are mainly terephthalic acid (TA) and its derivative dimethyl terephthalate (DMT). Isophtalic acid or phthalic acid can also be used.  In addition, polyester wire enamels contain cross-linking agent, phenolic resin and special additives. 

Deatherm T 808
Terebec  SL 225

Electro Insulation enamel Primary Insulation Contacts

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