What We Do

At Poly-Ject Inc. we provide our customers with innovative designs and high quality products all at a reasonable cost.

Operating in the heart of New England. We have been serving New England and the United States with great quality plastic injection molded parts for over 30 years. With quality plastic injection molding services offered by Poly-Ject Inc., located in Amherst New Hampshire, there is no need to go off shore for quality or price.

  • Mold Making
  • Design to build capacity
  • Single Cavity through multiple cavities
  • Simple to Complex
  • Manual to Automated molds
  • Mold design example
  • Injection Molding
  • Multiple Molding Machines various in size
  • Manufacturer in different material to suit your needs:
  • Delrin HIPS Ryton Polysulfone Nylon

What People Are Saying!

“On behalf of KMS, I want to thank you and all those at Poly-Ject involved in supplying the 6? CPVC end fittings this month. Your outstanding effort allowed KMS to ship, on time, a very critical order. We are looking forward to continuing our business relationship as well as exploring new opportunities. Very satisfied. One of my best suppliers.”


“Kollsman, Inc. Is pleased to advise you that based upon Poly-Ject Inc. excellent quality performance and customer service with Kollsman your facility has been granted the status of Certified Supplier. The achievement is not easily obtained and is a tribute to the high standards set by all your employees. Congratulations!”

James Anderson, Kollsman

“Everyone at Poly-Ject has been excellent to work with. We consider Poly-Ject to be one of our best suppliers.”

Douglas American Calan

Let’s build something together.