Within the polyester group of resins, with which it shares the characteristics of other thermoplastic polyesters, we find PBT or PTMMT (lesser used), or polybutylene terephthalate: a synthetic, semi-crystalline high-performance thermoplastic with a high molecular weight and often characterized by a durable, engineerable plastic. Color variations in the PBT range from white to bright colors.

Highly resistant to dynamic stress, abrasion and impact, it is distinguished by high stiffness and excellent resistance to thermal deformation. When a material with high strength, good dimensional stability, good insulation and rapid crystallization is needed, PTB proves to be the best choice.

It is generally reinforced with glass fiber or other reinforcing agents, in order to optimize both its mechanical and thermal resistance, thus achieving greater performance in terms of resilience, strength and wear resistance, as well as cost. In addition, the use of additives, enhance its UV resistance properties and make it fire retardant, so that it can also be used outdoors.

Present in everyday life and in a wide variety of forms, because the uses of this material are many and ever-expanding. Broadly speaking, they can be divided into the following sectors such as: the automotive industry, including both mechanical and electronic parts, the mechanical industry, in particular as far as the creation of springs, profiles and gears is concerned, the electrical or electronic industry for connectors, switches, capacitors, but also the textile industry, toys, household and leisure items.

The main processing technologies for PBT are injection molding, extrusion and blow molding; this polymer also lends itself to numerous post-molding operations, such as bonding, welding, painting and printing or laser marking.