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What is the difference between Glass Fiber Reinforced PET Granules and glass fiber reinforced PBT?

Jan. 17. 2020

What is the difference between Glass Fiber Reinforced PET Granules and glass fiber reinforced PBT? Fiber-reinforced PET has better heat resistance, higher heat distortion temperature, PET has better high-temperature resistance and better heat resistance than PBT.

PET is more difficult to crystallize polybutylene terephthalate than PBT. PBT is a milky white translucent to opaque, crystalline thermoplastic polyester. It has high heat resistance, toughness, fatigue resistance, self-lubrication, low friction coefficient, low weather resistance and low water absorption, only 0.1%. It still maintains various physical properties (including electrical properties) and electrical insulation in a humid environment But volume resistance and dielectric loss are large.

Glass Fiber Reinforced PET Granules

Glass Fiber Reinforced PET Granules

It can withstand hot water, alkalis, acids, and oils, but it is susceptible to halogenated hydrocarbons, poor hydrolysis resistance, rapid crystallization at low temperatures, and good moldability. The disadvantage is that the notched impact strength is low and the molding shrinkage is large. Therefore, most of them are reinforced with glass fibers or modified with inorganic fillers. Their tensile strength and bending strength can be more than doubled, and the heat distortion temperature is also greatly increased. It can work at 140 ℃ for a long time. The longitudinal and transverse shrinkage of the glass fiber reinforced products are inconsistent, and the products are prone to warp. PBT has a fast crystallization speed. The most suitable processing method is injection molding. Other methods include extrusion, blow molding, coating and various secondary processing. Pre-drying is required before molding, and the moisture content must be reduced to 0.02%. PBT (reinforced, modified PBT) is mainly used in automobiles, electronic appliances, industrial machinery and polymer alloys, and blending industries. Our company has PBT Compounds for sale.

PET is widely used as fiber, and engineering plastic resins can be divided into two categories: non-engineering plastic grade and engineering plastic grade. Non-engineering plastic grade is mainly used for bottles, films, sheets, and baking-resistant food containers. PET is a milky white or light yellow, highly crystalline polymer with a smooth and shiny surface. It has excellent physical and mechanical properties in a wide temperature range. The long-term use temperature can reach 120°C. The electrical insulation is excellent. Even at high temperature and high frequency, its electrical performance is still good, but the corona resistance is poor. Creep, fatigue resistance, friction resistance, and dimensional stability are all very good.

PET has an ester bond, which will decompose under the action of strong acids, alkalis and water vapor. It is resistant to organic solvents and weathering. The disadvantages are slow crystallization rate, difficult molding process, high molding temperature, long production cycle and poor impact performance. We are PET Compound Factory, welcome to consult.