Dplen Polybutylene Terephthalate is a semi crystalline Thermoplastic engineering polymer having application in Electrical & Electronics industry as an insulator. PBT is resistant to solvents & a type of Polyester shrinks very little during forming, is mechanically strong, heat resistant up to 150 or 200 degree with glass fiber reinforcement and can be treated with flame retardants to make it noncombustible.