Reaction Injection Molding

Cost-Effective Productions Runs in the Thousands or Higher and/or for Large-Part Creation

Reaction Injection Molding Process Overview

With 3Diligent's reaction injection molding service, instead of injecting molten thermoplastic material, thermoset polymer resins are used. Mixing in the tool, a reaction takes place that drives the polymerization of the input materials, resulting in a solidified part in the mold.

The lower viscosity of the resin, relative to thermoplastic, allows for larger parts to be fabricated using this process, which would often otherwise suffer from imperfections when attempted at larger sizes.

For all the benefits of reaction molding, it does have a few drawbacks. First, the range of materials available to the process is smaller than thermoplastics, and resins generally cannot deliver the same kinds of material performance achievable with thermoplastics. Additionally, the relative wait time for parts to set means this process is slower on a per-part basis than traditional injection molding. As a result, it is typically most useful for quantities in the 1000 – 5000 piece range.

Take the guesswork out of
your procurement

Create an account and have a bid within minutes!


3Diligent has supported hundreds of companies in providing digital-manufacturing solutions for their most challenging project needs.

If you're interested in experiencing the power of our digital-manufacturing solutions firsthand, submit an RFQ through our secure portal or send an email detailing a few of the specifics of your project and we'll be in touch.

Reaction Injection Molding Process at a Glance

  • Standard Tolerance
  • Typical Batch Size
    Preferably 500+ (for unit cost savings)
  • Minimum Wall Thickness
Affordable. Lower costs for aluminum tooling and production runs above 500.
Strong. Filler options can increase density, strength, and other material properties.
Large and lightweight. Low viscosity allows for large and lightweight parts.
Longer lead times. Time is added per part made because of resin setting
More expensive raw materials. Compared to regular injection molding.
Example Materials

More Information: Related Pages

More Information: 3Diligent Blog

3Diligent: The Sourcing Solution for Industrial Grade Rapid Manufacturing

3Diligent: The Sourcing Solution for Industrial Grade Rapid Manufacturing

Instant Access to the Latest and Greatest 3D Printing, CNC Machining, and More… 3D printing is an incredible technology,

3Diligent Raises Nearly $1M in Seed Round

3Diligent Raises Nearly $1M in Seed Round

Well the word is out: we’ve raised a nearly $1M seed round and launched our web portal,  We are

Possibilities of 3D Printing

Possibilities of 3D Printing

There is no shortage of buzz these days about 3D Printing. A Netflix documentary about 3D Printing was a

Hello New York!

Hello New York!

Pretty awesome to see news of 3Diligent’s launch popping up in Times Square! One month after launch, news of

Video Overview of the 3Diligent Platform

Video Overview of the 3Diligent Platform

For those of you who couldn’t join us at RAPID last week, check out this quick video overview of

Why 3D Printing Stocks Have Tanked and Why That Actually Signals Great News for the Industry

Why 3D Printing Stocks Have Tanked and Why That Actually Signals Great News for the Industry

A lot has been made in the press of 3D Printing stocks – most notably Stratasys and 3D Systems

ProdEX Blog

Submitting an RFQ For 3D Printing Using The 3Diligent Platform

In this week’s post we will go over the steps to submit an RFQ for 3D printing and Rapid

Santa Barbara-Based Product Design Consultancy STEL Selects 3Diligent as 3D Printing Partner for Prototyping through Production

  STEL Designs Sporting Goods, Outdoor Adventure and Consumer Electronics Products from Concept to Prototype to High Volume Manufacturing

3Diligent Announces Addition of New 3D Printing Processes for Metal Parts; Now Offers Broadest Range of Popular Metal Rapid Manufacturing Options

Company CEO to Speak on Future of Metal Additive Manufacturing at Inside 3D Printing San Diego   San Diego,