Advantages

1. Excellent mechanical properties

• High strength: PBT boasts high tensile and flexural strength, enabling it to withstand significant external forces. This ensures the stability and reliability of products in mechanical structural applications.

• Good toughness: With favorable impact strength, PBT resists cracking under impact, making it suitable for manufacturing auto parts and other components subject to impact.

2. Superior thermal properties

• High melting point: PBT melts at 225 - 235℃, maintaining shape stability in high - temperature environments and meeting heat - resistance requirements.

• High heat - distortion temperature: Its heat - distortion temperature exceeds 100℃ under load, and can be further enhanced with glass fiber reinforcement, adapting to high - temperature working conditions.

3. Outstanding electrical properties

• High insulation: PBT features excellent electrical insulation, high volume resistivity, and low dielectric constant and dissipation factor, preventing current leakage and interference, and widely used in electrical insulation parts.

• Good corona resistance: It resists corona discharge in high - voltage, high - frequency electric fields, ensuring electrical equipment safety.

4. Good processability

• High fluidity: In a molten state, PBT flows well, quickly filling complex mold cavities, improving production efficiency and product quality.

• Stable shrinkage rate: Its low and consistent molding shrinkage rate ensures dimensional accuracy and stability, reducing post - molding deviations and deformations.

• Strong chemical stability: PBT resists most organic solvents, acids, and alkalis, maintaining performance in various chemical environments, suitable for parts and containers in contact with chemicals.

  
  

  

Disadvantages

1. Poor hydrolysis resistance: PBT hydrolyzes under high - temperature, high - humidity conditions, breaking molecular chains and degrading mechanical and electrical properties, especially in long - term water contact.

2. High notch sensitivity: PBT's impact strength drops sharply at notches, prone to crack initiation and propagation, requiring careful design to avoid sharp notches and stress concentrations.

3. Moderate flame retardancy: Pure PBT is flammable and often requires flame retardants to meet high - fire - safety requirements.

4. Relatively high cost: Compared with common plastics like PE and PP, PBT's higher production cost limits its use in cost - sensitive applications.