Top 17 Injection Molding Manufacturers in Connecticut 2026

Forum Plastics LLC

Watertown, Connecticut101 employees

Forum Plastics LLC operates from Watertown, Connecticut. The company traces its roots to 1992 when GM Tool & Forum Molding Inc.

Plastic Design International Inc

Middletown, Connecticut

Plastic Design International (PDI Molding) operates from Middletown, Connecticut, where it was founded in 1977 as a short-run prototype R&D business. The company has since evolved into a full-service injection molding resource center with two facilities totaling 55,000 square feet.

Plastic Molding Manufacturing, Berlin CT

Berlin, Connecticut

Plastic Molding Manufacturing is headquartered in Berlin, Connecticut, and traces its origins to 1968 when founder George E. Danis established Danis Manufacturing Company (DAMCO Inc.) and Plastic Molding Manufacturing Inc.

Arkadia Plastics Inc

New Britain, Connecticut

Arkadia Plastics Inc operates from New Britain, Connecticut, where it was founded in 1996. The company is a custom compounding specialist focused on thermoplastic materials.

Edco Industries operates from Bridgeport, Connecticut, where it was founded in 1978 as a family-owned and operated business. The company traces its roots to the Szalan family, with John T.

J&L Plastic Molding

Wallingford, Connecticut

J&L Plastic Molding operates from Wallingford, Connecticut, where it runs a molding facility across two buildings. The shop specializes in injection molding, prototype and production tooling, insert molding, and tool transfer services.

MPS Plastics Inc

Marlborough, Connecticut

MPS Plastics has operated in Marlborough, Connecticut, for over 40 years. The company was established in the region known for mold-making tradition and serves customers across the United States.

Promold Plastics

Portland, Connecticut

Promold Plastics is headquartered in Portland, Connecticut. The company was founded in 1967 by Riccardo Puglielli, an Italian immigrant who started a one‑man tool and die shop.

Stelray Plastic Products Inc

Ansonia, Connecticut

Stelray Plastic Products Inc is a family-owned contract manufacturer based in Ansonia, Connecticut. The company has been operating for over 50 years, emphasizing American-made production and a full-service approach to precision injection molding and mold building.

All Molded Plastics

Wallingford, Connecticut

All Molded Plastics operates from Wallingford, Connecticut, where it was founded as a family-owned corporation. The company's history notes that operations began in the state, though a specific founding year is not disclosed.