Coroplast is North America's market share leader and largest manufacturer of corrugated plastic sheet for signs and re-usable packaging. We distribute our products through a network of independent distributors. The Granby, Quebec manufacturing plant opened in November, 1975. Coroplast opened another manufacturing plant in Vanceburg, Kentucky. In 2005, Coroplast acquired the plastic corrugated division of Spartech located in Cornwall, Ontario. In 2014, Coroplast became part of the Inteplast Group