Heat Treating Services Unlimited Inc. (HTSU), an accredited testing and calibration laboratory specializing in the thermal-processing industry, acquired Denver, N.C.-based Furnace Mechanix, a furnace refractory rebuilder. The acquisition of assets and personnel will enhance HTSU’s refractory services. The division will operate as a division of HTSU under the direction of Vice President Kevin Ruff and Gene Corneau, newly appointed division manager. The investment in equipment and personnel bolsters HTSU’s portfolio of maintenance, calibration, repair and testing services.