The polybutylene terephthalate (PBT) is a partially crystalline thermoplastic material, belonging to the family of aromatic polyesters. Compared to PET crystallizes faster and this allows him to be more suitable for injection molding. The chemical structure and the general characteristics of PBT (aka PTMT) are very similar to those of PET. For the condensation, it is used in place of ethylene 1,4 – butanediol.
CHARACTERISTICS AND APPLICATION FIELDS
The PBT is generally worked by injection molding; the connections are allowed for various types of welding and gluing.
The PBT has slightly lower strength and stiffness than those of PET, while the toughness at low temperatures is significantly better. The flow characteristics and withdrawal are very good. It has maximum stability to heat between 180 ° C and 200 ° C. The PBT is an electrical insulator: its characteristics are not influenced by the absorption of water, the temperature or frequency. The permeability to carbon dioxide is much higher than that of PET, while the resistance to chemicals, the combustibility and the weather resistance are similar. The PBT also more resistant to hot water and is permitted for foodstuffs. They can be added fillers, reinforcing agents and elastomers to improve its performance in terms of resilience, flowability, flame resistance, stiffness, strength and wear resistance.
The PBT can be used for the realization of smooth bearings, parts for valves, screws, edges of plug sockets, roller bearings, pump components, parts for electrical appliances and wheels.
PBT: TRADE NAMES
Shown below are the most common trade names for the PBT material.
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