Polybutylene terephthalate

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Polybutylene terephthalate
PBT chemica struc.svg
Identifiers
CAS number 24968-12-5 YesY
Properties[1]
Molecular formula (C12H12O4)n
Melting point 223 °C (433 °F; 496 K)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
Infobox references

Polybutylene terephthalate (PBT) is a thermoplastic engineering polymer that is used as an insulator in the electrical and electronics industries. It is a thermoplastic (semi-)crystalline polymer, and a type of polyester. PBT is resistant to solvents, shrinks very little during forming, is mechanically strong, heat-resistant up to 150 °C (or 200 °C with glass-fibre reinforcement) and can be treated with flame retardants to make it noncombustible.

PBT is closely related to other thermoplastic polyesters. Compared to PET (polyethylene terephthalate), PBT has slightly lower strength and rigidity, slightly better impact resistance, and a slightly lower glass transition temperature. PBT and PET are sensitive to hot water above 60 °C (140 °F). PBT and PET need UV protection if used outdoors, and most grades of these polyesters are flammable, although additives can be used to improve both UV and flammability properties.

Applications[edit]

Polybutylene terephthalate is used for housings in electrical engineering, but also in automotive construction as plug connectors and in households for example in showerheads or irons. It is also found processed into fibers in toothbrushes and is used in the keycaps of some mechanical keyboards because of its resistance to wear.

PBT can also be made into yarn. This has a natural stretch similar to Lycra® and can be incorporated into sports wear. On account of its chlorine resistance it is found especially in swimwear.[2]

Trade names[edit]

References[edit]

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