Polybutylene terephthalate
Thermoplastics > Polyesters
PBT - Polybutylene terephthalate XDUR
It is a semicrystalline engineering thermoplastic, with excellent properties of resistance to breakage and high resistance to temperature. Polybutylene terephthalate (PBT) is a partially crystalline thermoplastic of the polyester family that crystallizes very slowly and, for this reason, depending on the transformation method, is available in an amorphous-transparent or crystalline-opaque state. The PBT stands out for its high mechanical strength, rigidity and stability as well as for its extremely high dimensional stability and its low tendency to creep. In addition, PBT, like polyester in general, has excellent friction properties and wear resistance.
The PBT is resistant to solvents, shrinks very little during forming, is mechanically strong, resistant to heat up to 150 ° C (or 200 ° C with fiberglass reinforcement) and can be treated with flame retardants to make it fireproof.
• Good breaking strength properties
• High deflection temperature, especially the grades loaded with fiberglass
• High rigidity and high hardness
• Good properties of low friction and resistance to abrasion.
• High dimensional stability (low coefficient of thermal expansion, low water absorption)
• Good electrical properties
• Good chemical resistance
• Good resistance in the weather
• Fast crystallization and short time cycles
Modifications:
The different formulations of the PBT provide materials with a wide range of properties grouped according to different characteristics such as: Flow properties, Reinforced materials, With mineral filler and glass spheres, With flame retardants, With special additives (Polymer modifiers).
Reinforcement material and functional additives.
- Fiberglass.
- Carbon fiber.
- Mineral loads.
- Crystal Balls.
- PTFE.
- Graphite.
- Molybdenum sulfide.
- Black coal.
- Flame retardant products with halogenated additives, halogen-free additives can be obtained.
Applications
It is widely used in electronics (electronic products housings, switches, capacitors, circuit breakers, etc.), fiber optic coating, automotive industry (molding of car headlights, windshield wipers, rearview mirrors, connectors in general, push buttons, etc.). ) and elaboration of masterbatch, fibers, sheets, among other uses and products. PBT also produces monofilaments for use, for example, in brush bristles.