Injection Molding for Polypropylene (PP) Parts

Thermoplastic polymer is used in packaging of consumer products and plastic components

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Polypropylene (PP) is a thermoplastic addition polymer, which is used predominantly in injection molding applications. PP is inexpensive and easy to access, and due to its semi-crystalline property it possesses a high flexural strength.

Key Benefits: PP is resistant to moisture absorption, and has a very slippery surface that makes it a good substitute for other plastics in a variety of low-friction applications. Polypropylene's properties are similar to polyethylene, but PP is slightly harder and more heat resistant.

Compare Properties of Molded Polypropylene

We offer numerous polypropylene options available for injection molding applications, each with their own distinctive qualities.

  Tensile Strength
Flexural Modulus
Heat Deflection
Key Attributes
Pro-fax 6323 4,930 psi 11% 210,000 psi 199.0 F
  • General purpose
  • Stress-crack resistant
Pro-fax SG702 2,900 psi 6% 150,000 psi 180.0 F
  • High impact resistance
  • Automotive
Pro-fax 6523 4,790 psi 12% 200,000 psi 190.0 F
  • Good stiffness
  • Food containers
Pro-fax PD702 4,500 psi 12% 170,000 psi 190.0 F
  • Dimensional stability
  • Good processability
FHR P5M6K-048 3,900 psi 11% 153,000 psi 183.0 F
  • High clarity

green plastic water bottle top

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Material Alternatives for Injection Molding

Navigating supply chain issues is a constant challenge, especially in times of material shortages. To help, we created a detailed guide to resin substitutes for commonly molded thermoplastics.

Polypropylene Uses

Polypropylene is featured in an array of injection molding applications, including the packaging of consumer products as well as being regularly used in plastic components in the automotive industry. Because of its relatively low density and weight, polypropylene can also be used in a variety of molded PP products such as:

  • Children's toys
  • Sporting goods
  • Caps
  • Closures
  • Automotive applications
  • Food trays
  • Cups and to-go containers
  • Household goods and appliances like dishwashers