Custom Injection Molding

Mack Molding was founded in 1920 as an injection molding company. Today, with 90 years of molding experience behind us, Mack has grown to be one of the top 10 non-automotive custom injection molders in North America.

Mack has been ISO 9002 certified since September 1993.

We operate six injection molding facilities in the eastern United States, with 120 injection molding machines ranging from 28 to 4000 tons of clamp force, and shot sizes from .6 to 800 ounces. We are veterans at solid injection, structural foam, overmolding, gas-assist and two-shot molding, and have processed the full gamut of performance materials from commodity grades to custom blends to conductive and engineering thermoplastic resins. Whether your product requires a single cavity, open and shut mold, or a complex, multi-cavity, multiple-gate, multiple-action tool, Mack can handle your job.