Top 8 Injection Molding Manufacturers in New Jersey 2026

Montrose Molders

Piscataway, New Jersey

Montrose Molders operates from Piscataway, New Jersey, where it was founded in 1966 by William Bruce Wilson. The company began as a 22-person tool shop producing tight-tolerance molds for the plastics industry and added its first injection molding press in 1972.

Van Ness Plastic Molding Co

Clifton, New Jersey

Van Ness Plastic Molding Co. was founded in 1945 in Clifton, New Jersey, and has remained a family-owned and operated business for more than 70 years.

Bennett Plastics

Paterson, New Jersey

Bennett Plastics was founded in 1982 in Paterson, New Jersey, just minutes from New York City. The company began as a family-owned and operated business focused on custom plastic injection molding and has remained under family ownership for over four decades.

East Coast Plastics, Inc.

West Berlin, New Jersey

East Coast Plastics, Inc. operates from West Berlin, New Jersey.

Emco Industrial Plastics

Cedar Grove, New Jersey

Emco Industrial Plastics operates from Cedar Grove, New Jersey. The company’s injection molding division has been manufacturing components since 1988.

Mira Plastics Co. Inc

Newton, New Jersey

Mira Plastics Co. Inc., a family-owned plastic injection molding company, was established in 1955 in Fredon Township, New Jersey (mailing address Newton, NJ).

Petro Packaging Company, Inc.

Cranford, New Jersey

Petro Packaging Company, Inc. operates from Cranford, New Jersey, where it was founded in 1960.

USA Injection Molding

Pennington, New Jersey

USA Injection Molding, a division of LMT Mercer Group, Inc., is headquartered in Lawrenceville, New Jersey. The parent company was formed in 1987 to supply the fence and deck industry with high-quality component parts.