Plastics & Packaging

Top 12 Injection Molding Manufacturers in New Hampshire 2026

Last updated October 16, 2026

12listings

FirmsLedger lists 12 injection molding manufacturers headquartered in New Hampshire. The largest cluster is in Hudson (2), and the other 10 are in 10 more cities. Hudson listings include Granite State Plastics and MRPC.

Capabilities that more than one of them list include plastic injection molding (2).

Compare all 10 in a table

Compare 10 injection molding manufacturers in New Hampshire
Company	City	Specialty	Phone	Website
Granite State Plastics	Hudson	Injection Molding	(603) 595-7790	granitestateplastics.com
Poly-Ject Inc	Amherst	Plastic injection molding	(603) 882-6570	polyject.com
TechNH, Inc.	Merrimack	Plastic injection molding	(603) 424-4404	technh.com
Ambix Manufacturing, Inc.	Albany	Plastic injection molding	(603) 452-5247	ambixmfg.com
EPTAM Precision \| Plastics	Northfield	Polymer machining	(866) 443-7826	eptam.com
Hy-Ten Plastics Inc	Milford	Custom Injection Molding	(603) 673-1611	hy-ten.com
MoldPro, Inc.	Swanzey	Plastic part design	(603) 357-2523	moldproinc.com
North American Plastics Ltd.	Manchester	Extrusion blow molding	(603) 644-1660	naplasticsltd.com
Pelham Plastics Inc	Pelham	Injection molding	(603) 886-7226	pelhamplastics.com
Plastech Machining & Fab Inc.	Bow	Precision plastics machining	(603) 228-7601	plastechfab.com

Granite State Plastics

Hudson, New Hampshire

Granite State Plastics operates from a 50,000-square-foot facility in Hudson, New Hampshire. The company has been dedicated to continuous improvement since 1969 and remains privately held, with a philosophy of reinvesting in its people and equipment.

Injection Molding Plastics & Packaging ManufacturersISO 13485:2016UL registered

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Call(603) 595-7790 Visit Website

Poly-Ject Inc

Amherst, New Hampshire

Poly-Ject Inc. was founded in 1982 in Amherst, New Hampshire.

Injection Molding Plastics & Packaging ManufacturersISO 9000

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Call(603) 882-6570 Visit Website

TechNH, Inc.

Merrimack, New Hampshire

TechNH, Inc. was founded in 1982 in a small corner of a Nashua, New Hampshire mill building.

Injection Molding Plastics & Packaging ManufacturersISO 13485:2016ITARFDA 21 CFR 820

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Call(603) 424-4404 Visit Website

Ambix Manufacturing, Inc.

Albany, New Hampshire

Ambix Manufacturing, Inc. was founded in 2001 in Albany, New Hampshire.

Injection Molding Plastics & Packaging ManufacturersISO 9001ISO 9000:2015ITAR

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Call(603) 452-5247 Visit Website

EPTAM Precision | Plastics

Northfield, New Hampshire

EPTAM Precision operates from Northfield, New Hampshire, under the leadership of President and Chief Financial Officer Graham Schillmoller. The company provides advanced precision manufacturing solutions for high-technology sectors.

Injection Molding Plastics & Packaging ManufacturersISO 9001:2015DS/EN ISO 13485:2016AS9100D

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Call(866) 443-7826 Visit Website

Hy-Ten Plastics Inc

Milford, New Hampshire

Hy-Ten Plastics Inc operates from its headquarters and production facility in Milford, New Hampshire. The company has served the medical, electronic, industrial, and consumer industries for 60 years, specializing in tight-tolerance plastic injection molding and related value-added services.

Injection Molding Plastics & Packaging ManufacturersISO 9001:2015ISO 13485:2016

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Call(603) 673-1611 Visit Website

MoldPro, Inc.

Swanzey, New Hampshire

MoldPro, Inc. was founded in 1989 in Swanzey, New Hampshire, by a group of tool makers.

Injection Molding Plastics & Packaging ManufacturersISO 9001:2015

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Call(603) 357-2523 Visit Website

North American Plastics Ltd.

Manchester, New Hampshire

North American Plastics Ltd. operates from Manchester, New Hampshire, as a provider of custom extrusion blow molding and blow molding product solutions.

Blow Molding Injection Molding Plastic Extrusion Plastics & Packaging ManufacturersISO 9001:2015

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Call(603) 644-1660 Visit Website

Pelham Plastics Inc

Pelham, New Hampshire

Pelham Plastics Inc operates from Pelham, New Hampshire. The company does not disclose its founding year or ownership structure, but its capabilities page describes its origins as a customer-centric venture built on an "open-door philosophy" emphasizing teamwork and one-on-one relationships.

Injection Molding Plastics & Packaging ManufacturersISO 13485:2016

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Call(603) 886-7226 Visit Website

Plastech Machining & Fab Inc.

Bow, New Hampshire

Plastech Machining & Fab Inc. operates from Bow, New Hampshire.

Injection Molding Plastics & Packaging ManufacturersISO 9001:2015

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Call(603) 228-7601 Visit Website

Infant Ear Molding of New Hampshire, LLCFremont, New Hampshire
MRPCHudson, New Hampshire

Frequently asked questions

Which injection molding manufacturers in New Hampshire list plastic injection molding?

2 companies list it: TechNH and Ambix Manufacturing.

Which certifications do injection molding manufacturers in New Hampshire list?

ISO 9001:2015: EPTAM Precision | Plastics, Hy-Ten Plastics and 3 others. ISO 13485:2016: Granite State Plastics, TechNH and 2 others. ITAR Registered: TechNH and Ambix Manufacturing.