Shamrock Plastics is a family-owned custom plastic fabrication company that turns client ideas into finished products, from design and engineering through in-house production and distribution. Founded by Tom Ruffner in Mount Vernon in 1989, it now operates in Ohio and South Carolina, with son Jay leading the Ohio location and son-in-law Nate partnering in Myrtle Beach. The company handles projects ranging from one-off prototypes to production runs, using extensive in-house CNC equipment and nearly 30 years of fabrication experience.
Rage Custom PlasticsFounded in Columbus in 1964, family-owned Rage Custom Plastics develops and manufactures injection-molded and injection stretch-blow-molded plastic products and components. From its headquarters in Hilliard, Ohio, the company supports projects from product design and prototyping through production, with four facilities across Ohio and Virginia. Its roots in engineering and prototyping remain central to how it helps customers turn early concepts into finished parts.HILLIARD, OH
Schubert Plastics IncFounded in 1994, family-owned and operated Schubert Plastics Inc. provides custom injection molding from its Delaware Valley facility south of Philadelphia. The company takes projects from concept through completion, combining in-house engineering with molding, post-molding support, and order fulfillment. Its equipment ranges from 35 to 618 tons, backed by more than 55 years of combined industry experience among its principals.LENNI, PA
Doyle Shamrock IndustriesFamily-owned since Michael A. Doyle established it in 1975, Doyle Shamrock Industries grew from a one-person operation into a Holland, Ohio, manufacturer serving customers across the United States and beyond. The company specializes in custom plastic injection molding, with 200,000 square feet across two manufacturing locations and an off-site warehouse. Its work is backed by ISO 9001:2015 and ISO 14001:2015 certification.HOLLAND, OH
Montville Plastics & RubberFounded in 1977, Montville Plastics & Rubber is a privately owned American manufacturer known for taking on complex custom plastics work. Based in rural Ohio, the company has grown from one machine in a garage to a 100,000-square-foot operation, with in-house tooling and product development for customers who need parts brought from concept into production.PARKMAN, OH