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 ASTM D638 |
Elongation ASTM D638 |
Flexural Modulus ASTM D790A |
Heat Deflection ASTM D648 |
Key Attributes | |
| Pro-fax 6323 | 4,930 psi | 11% | 210,000 psi | 199.0 F |
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| Pro-fax SG702 | 2,900 psi | 6% | 150,000 psi | 180.0 F |
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| Pro-fax 6523 | 4,790 psi | 12% | 200,000 psi | 190.0 F |
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| Pro-fax PD702 | 4,500 psi | 12% | 170,000 psi | 190.0 F |
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| FHR P5M6K-048 | 3,900 psi | 11% | 153,000 psi | 183.0 F |
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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
To learn more about all materials we offer, check out our material comparison guide. And, read our new white paper exploring material alternatives for plastic injection molding.
