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Glossary » Materials » Polymers » Polypropylene » Unfilled

Unfilled PP is a subcategory of Polypropylene. The additative is added during the manufacturing process. Its elastic modulus ranges from 165 to 225 MPa. Its flexural modulus ranges from 170 to 250 MPa. Its tensile strength ranges from 4500 to 6000 MPa at break. Its flexural strength ranges from 6000 to 8000 MPa. Its compressive strength ranges from 5500 to 8000 MPa. Its Izod Impact strength ranges from 0.4 to 1.4 J/cm. Its elongation at break ranges from 100 to 600 %. Its hardness ranges from 80 to 102 Rockwell R. Its specific gravity ranges from 0.9 to 0.91. Its coefficient of thermal expansion ranges from 81 to 100 x 10^-6/°C. Its molding pressure ranges from 10 to 20 MPa.

Polypropylene, also known as PP, is a thermoplastic, (crystalline), polymer. Common trade names are Marlex HGL and Fortilene 1800 series (FDA materials). homopolymer Its key attributes are high lubricity, high resistance to flexing (excellent material for living hinges), excellent dielectric strength and chemical resistance, good impact strength, and high solvent resistance. It is inexpensive and electroplatable, but it is difficult to paint, print on, or bond to. It will be attacked by fuming nitric acid and degraded by UV and ionizing radiation. PP can be used to make medical syringes, beakers, and parts for auto interiors.