Polyolefin

Polypropylene (PP)

Polypropylene is a low-density, low-cost semi-crystalline plastic with excellent chemical resistance and fatigue resistance. It is the classic material for molded living hinges. Request a quote or browse all materials.

Typical Properties

Polypropylene at a glance

Property	Typical value
Density	~0.90–0.91 g/cm³
Tensile strength	~30–35 MPa
Flexural modulus	~1.3–1.8 GPa
Elongation at break	>100%
Melting point	~160–165 °C
Heat deflection (0.45 MPa)	~90–110 °C
Water absorption	<0.1%
Flammability	HB typical

Typical homopolymer values; copolymers are tougher at low temperature. These are typical reference values from standard published data, not guaranteed minimums. Request material certificates in your RFQ if properties must be verified.

Advantages

Why engineers choose Polypropylene

Chemical resistance

Resists acids, bases, and many solvents.

Living hinges

Excellent fatigue resistance for integral hinges.

Low density

Lightweight and economical.

Moisture

Negligible moisture absorption.

Design considerations: Low stiffness and heat resistance; difficult to bond and paint; brittle at low temperatures (homopolymer); UV degradation without stabilizers.

Applications