HarbisonWalker International
Glass, Ceramics and Concrete ManufacturingPennsylvania, United States501-1000 Employees
HarbisonWalker International (HWI) operates in the glass, ceramics and concrete manufacturing sector and is the largest supplier of refractory products and services in the United States, with a history spanning more than 150 years. It is part of Calderys and serves as the Americas region brand for the group. The company maintains numerous manufacturing sites and strategically placed distribution centers across the Americas and hosts the largest refractory industry research facility in North America. HWI serves virtually every major industry that requires refractory solutions to enhance production and protect assets, and has a workforce of 501-1000 employees based in Pittsburgh, Pennsylvania. Recent activity includes expansions of facilities and offices in Missouri and the launch of HTT.EDU in 2025.