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Glossary » Materials » Polymers » Polybutylene » Extrusion Compound

Extrusion Compound PB is a subcategory of Polybutylene. It is specially formulated to extrusion compound. Its elastic modulus ranges from 30 to 40 MPa. Its flexural modulus ranges from 45 to 50 MPa. Its tensile strength ranges from 3800 to 4400 MPa at break. Its flexural strength ranges from 2000 to 2300 MPa. Its elongation at break ranges from 300 to 380 %. Its hardness ranges from 55 to 65 Shore D. Its specific gravity ranges from 0.91 to 0.925. Its coefficient of thermal expansion ranges from 128 to 150 x 10^-6/°C. Its molding pressure ranges from 10 to 30 MPa.

Polybutylene, also known as PB, is a thermoplastic polymer. Common trade names are Shell and Mitsui. It has high flexibility (even at low temperatures), a low embrittlement temperature, high toughness, high abrasion resistance, high resistance to chemical attack, and resistance to hot water and stress cracking. It has poor handling properties in the forms of semi-finished goods and moldings after processing because of the start of crystal rearrangement. PB can be used to make tubes, sheets, and profile extrusions by extrusion blow molding and/or injection molding.