PBT is known as one of the engineering plastics with excellent comprehensive performance. It is widely used in electrical, electronic, automobile, machinery, instrumentation and other industries as structural parts, such as coil skeletons, connectors, bases, etc. for TVs and radios. Suitable for structural parts that require lubricity and corrosion resistance, such as gears, bearings, etc. After the flame retardancy of PBT is enhanced, its performance is further improved, and it has more important uses in the above fields (see the section on the use of glass fiber reinforced PBT).
Chemical properties
The relative density is 1.31-1.55, and the water absorption rate is the lowest among thermoplastics, only 0.07%. It has excellent toughness and fatigue resistance, high impact strength, self-lubrication and wear resistance, small friction coefficient, but high notch sensitivity. Good heat and weather resistance, flame retardant, but slow burning. Good dimensional stability, excellent electrical properties, and good arc resistance, but the volume resistivity and high-frequency dielectric loss tangent are large. Excellent chemical resistance, alcohol, aliphatic hydrocarbon, acid and salt aqueous solution, etc. do not work. Resistant to carbon tetrachloride, swells in dichloroethane, somewhat swells in aromatics, acetic acid and ethyl acetate, decomposes in concentrated nitric acid and sulfuric acid. It is resistant to hot water and oil, but it is easily corroded by halogenated hydrocarbons and has poor hydrolysis resistance. Low melt viscosity, excellent film forming and formability, but large shrinkage, good film flexibility, high tear and yield strength. PBT molding can be injection molding, extrusion, blow molding, coating, welding, bonding, machining, vacuum forming, vacuum metallization, coating, etc.
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