Product Description:
The PBT polymer backbone consists of saturated linear molecules wherein each repeating unit incorporates a rigid benzene ring combined with a flexible aliphatic alcohol segment. This molecular architecture, characterized by high geometric regularity and rigidity, imparts to the polymer high mechanical strength, outstanding chemical resistance, excellent heat resistance, and superior electrical properties. The absence of side chains and the symmetrical molecular structure satisfy requirements for dense chain packing, resulting in high crystallinity and a high melting point. This molecular structure fundamentally determines the excellent comprehensive performance characteristics of PBT.
PBT represents the most recently developed and fastest-growing variety among industrial plastics, having emerged as a rising star within the engineering plastics category. Its success stems primarily from excellent comprehensive performance, good molding processability, and favorable performance-to-cost ratio. Although PBT plastics were industrialized during the 1970s, they rapidly gained market acceptance and now rank as the fastest-growing among the five major engineering plastics.
Key Properties:
Excellent mechanical properties including high mechanical strength, exceptional fatigue resistance, outstanding dimensional stability, and minimal creep, with these characteristics showing little variation under elevated temperature conditions.
The energy consumption required for PBT production is the lowest among engineering plastics, a significant advantage in the context of global energy resource constraints.
Excellent heat aging resistance with enhanced UL temperature index ranging from 120°C to 140°C; outdoor long-term aging performance is also very good.
Good solvent resistance with no susceptibility to stress cracking.
PBT readily accepts flame retardant additives and can achieve FR V-0 ratings. Its good affinity with flame retardant systems facilitates the development of both reactive and additive flame retardant grades. Flame retardant PBT products are widely used in the electronic and electrical industry.
A processing consideration: PBT is susceptible to hydrolysis degradation when exposed to moisture under high temperature and high humidity conditions, requiring thorough drying before processing.
Outstanding electrical properties including high volume resistivity, high dielectric strength, excellent arc resistance, minimal moisture absorption, and stable electrical performance in both wet and high-temperature environments, making it an ideal material for manufacturing electronic and electrical components.
Easy molding and secondary processing capabilities, allowing processing on conventional injection molding or extrusion equipment. Due to fast crystallization speed and good melt flowability, required mold temperatures are lower than those for many other engineering materials. Cycle times are short: thin-walled parts can be processed in just a few seconds, while larger parts typically require 40-60 seconds.
