Poly-Ject, Inc.

Founded in 1982, Poly-Ject Inc. is a custom plastic injection molding company that is your complete source for injection molded products. We are a full service design, rapid prototyping, mold making and plastic injection molding company. Our manufacturing facility located at the heart of New England in Amherst New Hampshire, utilizes the latest state of the art machinery to ensure that the product we ship meets or exceeds the requirements of our customers. 

Let’s build something together.


Everything we do is in house.


Learn more about our facility and tools.


Take a peek at some of our work.

Stringent quality control

Manufacture to exact specifications

In-house mold-making

In-house design capabilities

24 hours a day 5 days a week production

26,000 square foot facility

Get In Touch


Ph. 603-882-6570

Fax: 603-880-3144


8 Manhattan Dr, Amherst, NH 03031

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