Harper International is a leading manufacturer of custom engineered thermal processing systems and equipment designed to meet exacting processing requirements. Harper has been engineering and building custom kilns and furnaces for more than 80 years. We have been the innovator of many new technologies including: carbon fiber furnaces, pusher tunnel kilns for the electronics ceramics and advanced ceramics industries, complete turnkey carbon fiber lines, specialized furnace systems for solar cell production and silicon melt furnaces, rotary kilns for the processing of refractory metals and the calcining of specialty materials, and vertical gravity flow reactors.