Unsaturated Polyester Resins are formed when organic dibasic acids or anhydrides are reacted with a glycol. The resultant ester undergoes co-polymerization in a self sustaining reaction forming Unsaturated Polyester and is then blended with an organic solvent.

When a peroxide is added to this liquid resin, the un-saturation breaks and interlinking chains are formed solidifying the polyester into a permanent structure.

Unlike Thermoplastics, Polyester Resins are usually reinforced with natural/synthetic fibres.

Thus strength of the resultant object is not imparted by the bulk of the resin but rather by the mechanical properties of the reinforcement. This Result in:

Lighter weight of the material
Superior Mechanical Properties (Comparable to steel and other metals)
Corrosion Resistance (imparted by the polymer)
Design Flexibility
Low tooling costs

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