Mack Molding Company | 7,319 followers on LinkedIn. Plastic Molding - Metal - Manufacturing | Mack Molding Co., headquartered in Arlington, VT, provides design through FDA-approved manufacturing services to the medical, commercial, computer & business equipment, energy and transportation markets. With over 90 years of plastics expertise, the company integrates product development, custom injection molding, sheet metal fabrication, full-service machining and full product assembly in ISO 9001, ISO 13485, and ISO 14001 environments. Product development resources include design, prototyping, and extensive engineering services.