The Granger Plastics Company was established in September 1994 by John Grimes, a rotomolding veteran. In the 1950s, his father, John Grimes Sr., was credited with being one of the industry's founding architects.In 1998, Grimes and his company partner realised they needed more experience for the potential they had just discovered, so they added a third partner. John's previous coworker from his rotomolding days would join the Granger Plastics staff as Jim Cravens. Jim would play a crucial role in Granger's continued expansion, elevating the business to new heights and offering cutting-edge solutions for a large number of brand-new rotomolding clients.

When the rotational moulding business was founded in Sharonville, Ohio, in 1994, it soon saw significant growth for custom rotationally moulded items inside of its first five years.