Polypropylene Homopolymer

material

A thermoplastic polymer made from propylene monomer units only, offering high chemical resistance, low density, and excellent processability for rigid applications.

In Simple Terms

Polypropylene homopolymer is the purest form of polypropylene plastic, made from only propylene molecules. It's lighter than water, chemically resistant, and easily processed into rigid products like bottle caps, automotive parts, and food containers.

Why It Matters

PP homopolymer offers the highest stiffness and strength among polypropylene grades, making it ideal for structural applications. Its excellent chemical resistance and FDA approval for food contact make it a preferred choice for packaging applications.

Technical Details

PP homopolymer exhibits crystallinity levels of 50-70%, density around 0.90-0.91 g/cm³, and melting point of 160-165°C. It demonstrates excellent fatigue resistance, low moisture absorption, and superior chemical resistance to acids, bases, and organic solvents. The polymer chains consist solely of propylene repeat units in isotactic configuration.

Real-World Examples

Injection molding bottle caps

PP homopolymer's high stiffness and chemical resistance make it perfect for molding rigid bottle caps that maintain thread integrity and resist chemical attack from contents.

Automotive battery cases

The material's excellent acid resistance and structural strength make it ideal for battery housings that must withstand sulfuric acid exposure while maintaining dimensional stability.

Food packaging containers

FDA-approved PP homopolymer grades provide safe food contact properties while offering the rigidity needed for stackable containers and lids in food service applications.