blue injection molded part

Injection Molding Service

Digital manufacturing for plastic prototypes and on-demand production parts. Request an injection molding quote today.

  • Free design analysis included with every quote
  • Select from hundreds of resins or supply your own
  • Consult with our team of injection molding experts


ISO 9001: 2015 | ITAR Registered

Plastic and elastomeric materials
Product developers served
4.4 Million
Parts molded each month

Injection Molding Processes

Make the move from prototyping to on-demand manufacturing for affordable, high-quality molded parts within days. Better yet, your prototyping tool is free once you shift to an on-demand manufacturing tool. Working with a single supplier that provides free design consultation services also massively speeds up the manufacturing process, allowing for greater supply chain flexibility, more consistent parts, and making qualification a breeze.


Plastic Injection Molding

Black plastic part

Plastic injection molding is a manufacturing process where resin in a barrel is heated to a molten state, then shot into a mold to form a final production-grade thermoplastic part.


Liquid Silicone Rubber Molding

silicone rubber part

Liquid silicone rubber molding is a thermoset process that mixes a two-component compound together, which is then heat cured in the mold with a platinum catalyst to produce a final part.


Overmolding & Insert Molding

Overmolding and insert molding are two-part injection molding processes where one material is overlaid onto a second substrate part or metal insert to create a single component.


New Critical-to-Quality Features in Molded Parts

What if you could indicate the dimensions that were really important to the function of your parts, while potentially speeding up manufacturing and lowering costs? That’s the core idea behind our manufacturing process, which lets you call out Critical-to-Quality (CTQ) features in your 3D CAD model so you can be assured that the parts you order are consistent with your model.


Tooling Options and Quality Reporting

We have two unique offers that meet your needs wherever you are in the product lifecycle. Our prototype molding process helps you cut product development cycles by weeks—sometimes months—and bridge to production with injection-molded parts within days. Our On-demand Manufacturing process helps you qualify parts quickly and seamlessly transition into production with scientific molding, critical-to-quality FAI and capability studies completed on automated CMM machines, and a full suite of secondary operations to make sure that your end-use production parts show up as expected.

  Prototyping On-Demand Manufacturing

I need to validate my design at Protolabs speeds. I need the flexibility to economically iterate before production.

I have on-demand production needs at Protolabs speeds.

Best When
  • Completing design or material iterations, and assessing cost or manufacturability tradeoffs
  • Key focus is to reduce design risk, increase R&D productivity and quickly iterate to speed product release to market
  • Typical Quantities <2,000
  • Design and configuration is finalized and focus is to reduce supply chain risk, quality, and total cost of ownership
  • Run-to-run part consistency is critical
  • Qualification documentation and mold capability information is required
Mold Cavities Single Single and multi-cavity
Mold Life Limited (guaranteed for at least 2,000 shots) Unlimited
Mold Storage Stored for 18 months of inactivity Stored for 3 years of inactivity
Mold Ownership Upon request Yes
Quality Documentation Basic inspection reports available upon request
  • Critical-to-Quality First Article Inspection*
  • Critical-to-Quality 30-part capability study*
  • Critical-to-Quality dimensions checked during all runs
  • Scientific molding process development report*
  • In-line CMM measurement technology
  • PPAP, IQ/OQ/PQ, ISo13485 through approved partners.
Shared Features

Aluminum molds
Standard lead time of 15 days or less
Tolerances of +/-0.003 in. plus resin tolerance (in./in.)
Set-up fees apply to each run 
Consultative Design Services (CDS)
Finishing Options
No minimum order quantities (MOQ)
Quick-turn shipping in as fast as 1 day

*Inspection conducted on initial run of parts

Injection Molding Materials

We have wide selection of more than 100 thermoplastic and thermoset materials. And if you're looking for alternative material options, check out our guide to resin substitutes for ABS, PC, PP, and other commonly molded plastics.




  • Standard silicone (30, 40, 50, 60, and 70 durometers)
  • Medical-grade silicone
  • Optical-grade silicone
  • Fluorosilicone (fuel and oil resistant)


red plastic parts

If you have any issues getting your guide, click here to download.

Injection Molding Design Guide

Learn the basics of creating quality plastic parts with this downloadable guide.

Why Choose Protolabs for Injection Molding?

Additional Links and Resources