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Glossary » Materials » Polymers » Polyester » Glass Fiber Reinforced, Premix Chopped Glass

Glass Fiber Reinforced, Premix Chopped Glass Polyester is a subcategory of Polyester. The additative is added during the manufacturing process. Its elastic modulus ranges from 1000 to 2500 MPa. Its flexural modulus ranges from 1000 to 2000 MPa. Its tensile strength ranges from 3000 to 10000 MPa at break. Its flexural strength ranges from 7000 to 20000 MPa. Its compressive strength ranges from 20000 to 30000 MPa. Its Izod Impact strength ranges from 1.5 to 16 J/cm. Its elongation at break ranges from 0.5 to 1 %. Its hardness ranges from 50 to 80 . Its specific gravity ranges from 1.65 to 2.3. Its coefficient of thermal expansion ranges from 20 to 33 x 10^-6/°C. Its molding pressure ranges from 0.5 to 2 MPa.

Polyester is a thermoplastic or thermoset polycondensate. Common trade names are Valox and Celanex. It has excellent dimensional stability, high dielectric strength, and good toughness. It has moderate chemical resistance, low resistance to strong acids and bases, and is notch sensitive. However, it is not recommended for outdoor use or in hot water. Polyester is very popular in making clothing and handles.