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Polypropylene (PP) Injection Molding

  • Prototype Tool In Soon As 10 Days
  • Production Tool In As Soon As 3 Weeks
  • 10k Parts in 10 Days
Quotes for 25+ Manufacturing Processes.
Tooling & Injection Molding Services
Complex Parts
Highly Scalable
with Versatile Materials
Any Size
Company Supported
Polypropylene (PP) Injection Molding

Partner with Fathom for high-quality polypropylene (PP) injection molded parts. Whether your project is time-sensitive, requires high precision, is short production run related, or is highly complex, Fathom’s team of experts is ready to help. Injection molding is just one of many manufacturing technologies offered by Fathom. Get started today.

What is Polypropylene (PP)? / /

Polypropylene (PP) is a thermoplastic made from propylene monomers. PP is a widely used plastic for injection molding and is sometimes used as an alternative to polyoxymethylene POM. Polypropylene can be heated to its melting point, cooled, and then reheated without degradation, making it a recyclable material. PP is often used for non-load bearing applications, including food containers, cups, toys, dishwasher-safe utensils, etc.

Benefits of Polypropylene (PP) Injection Molding / /

Polypropylene has many favorable qualities that make it popular for injection molding. PP is a cost-effective and widely available raw material. It has a slippery surface, high flexural strength, and a semi-crystalline nature. Polypropylene has chemical and fatigue resistance, good impact strength, and moisture resistance.

PP Injection Molding Properties and Conditions / /

When designing for PP injection molding, there are multiple important factors to consider. PP has a low melt viscosity that allows it to flow well. As such, it has a fast plastic injection molding speed which means the mold can be quickly filled with polypropylene. The shrinkage rate of PP is 1 to 2%. Polypropylene has a melting temperature of 266 degrees Fahrenheit and mold temperature between 90 to 150 degrees Fahrenheit. PP has an injection molding pressure as high as 180 MPa.

Polypropylene Injection Molding Finishes / /

After injection molding, the part is moved to the finishing stage. During finishing, the part’s appearance is enhanced, or physical properties added. Here are some of the finishes offered by Fathom.

Standard No Machine Mark Tool Marks Removed Low Cosmetic
SPI-C1 600 Stone Low Polish Parts
SPI-B1 600 Grit Paper Medium Polish Parts
SPI-A2 Grade #6 Diamond High Polish Parts
SPI-A1 Grade #3 Lens or Mirror
IM-1 Light Bead Blast Need 1 Degree Draft Angle
IM-2 Medium Bead Blast Need 1.5 Degree Draft Angle
IM-3 Heavy Bead Blast Need 3 Degree Draft Angle

Injection Molding Machines Used by Fathom / /

Fathom is an experienced manufacturer offering injection molding and hybridized services that leverage different kinds of 3D printing. Are you ready to incorporate injection molding into your complex project? Fathom can handle it. In a recent case study, Fathom delivered over 20,000 parts in 27 days, using 55+ tools, including multiple injection molding services:

Case Study //

Real Customers. Real Results.

A customer came to Fathom with a complex project that spanned the technologies and processes of rapid production—and needed it done fast. Fathom delivered.

20,000 Parts // Within 27 Days
55+ Tools to Injection Mold 15,000 Parts First Article in 2 Weeks

55+ Tools to Injection
Mold 15,000 Parts

First Article in 2 Weeks

3,000+ 3D Printed Parts

3,000+ 3D
Printed Parts

2,000+ Metal Fabricated Parts

2,000+ Metal
Fabricated Parts

Hybridized Services Used //

3D Printing / Additive Manufacturing—PolyJet, SLS, MJF.

DFM Analysis + CAD Mods.

CNC Machining. Laser Cutting.

Stamping. Die Cutting. Post-Opp Drilling.

24-hour Turnaround Urethane Casting.

Injection + Compression Molding.

Model Finishing. Insert Assembly.

Advanced Project Management.

Polypropylene Injection Molding FAQs / /

Q: Does Fathom offer injection molding?

A: Yes, Fathom offers injection molding services.

Q: What is injection molding?

A: Injection molding is a manufacturing process commonly used for plastic parts. During injection molding, molten plastic is injected into a two-part mold using high pressure. Once the part has cooled inside the mold, it is ejected. The part may or may not require a secondary finish.

Q: Is Fathom ISO certified?

A: Fathom’s certifications include ISO 9001:2015, ISO 9001:2015 Design, and ISO 13485:2016. For site-specific certifications, please visit https://fathommfg.com/fathom-manufacturing-certifications.

Q: Is Fathom ITAR certified?

A: Yes, Fathom is ITAR certified. For site-specific certifications, please visit https://fathommfg.com/fathom-manufacturing-certifications.

Q: Is Fathom AS9100:2016 certified?

A: Yes, Fathom is AS9100:2016. For site-specific certifications, please visit https://fathommfg.com/fathom-manufacturing-certifications.

Q: Is Fathom NIST 800-171 certified?

A: Yes, Fathom’s certifications include NIST 800-171. For site-specific certifications, please visit https://fathommfg.com/fathom-manufacturing-certifications.

Q: Can polypropylene be used in injection molding?

A: Yes, polypropylene can be used for injection molding.

Q: Why is polypropylene good for injection molding?

A: Polypropylene (PP) is good for injection molding because it is heat and fatigue resistant, tough and versatile. PP can be used for a wide variety of applications.

Q: Can PP be injection molded?

A: Yes, polypropylene (PP) is widely used for injection molding. Parts made from PP include plastic containers, packaging, water bottles, furniture and living hinges.

Q: How do you mold polypropylene?

A: Polypropylene (PP) for injection molding begins in pellet form. The pellets are moved down a barrel where they are heated. Once melted, PP is injected into a two-sided custom mold where the part is formed. After the part is cooled, it is ejected from the mold and moved to finishing.

How to Get Polypropylene Molding Quotes / /

Are you ready for a quote on your injection molding design? Do you want to calculate costs for an upcoming project? Use Fathom’s SmartQuote platform for a fast quote.

Manufacturing Locations Across National Time Zones
Manufacturing Locations Across National Time Zones
The Fathom Advanced Manufacturing Platform
new map update 3

1050 Walnut Ridge Drive
Hartland, WI 53029
ISO 9001:2015


444 W. 21st St. Ste. 101
Tempe, AZ 85282
ISO 9001:2015
NIST800-171 Compliant


7770 Washington St.
Denver, CO 80229
ISO 9001:2015


13758 Johnson Street NE
Ham Lake, MN 55304


1801 Rowe Lane
Pflugerville, TX 78660
ISO 9001:2015

1513 Sam Bass Rd
Round Rock, TX 78681
ISO 9001:2015
ISO 13485:2016


46758 Lakeview Blvd,
Fremont, CA 94538
ISO 9001:2015 Design Certified
NIST 800-171 Compliant


14000 N.W. 58th Court
Miami Lakes, FL 33014


1920 Slaterville Rd
Ithaca, NY 14850

401 W. Shore Blvd.
Newark, NY 14513
ISO 9001:2015


1207 Adams Drive
McHenry, IL 60051
ISO 9001:2015

1401 Brummel Ave
Elk Grove, IL 60007
ISO 9001:2015 Design Certified

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