Lindberg/MPH shipped four heavy-duty tube furnaces to a manufacturer of thermocouples for use in a laboratory to heat treat parts inside tubes. The furnaces, which provide rapid heat-up rates along with fast cooling and response time, have a maximum temperature rating of 1500°C (2732°F)and work chamber dimensions of 3 inches in diameter and 34 inches long with removable side panels. Double-end silicon-carbide heating elements are mounted above and below the furnace chamber for uniform heating. The chambers are constructed of high-temperature graded insulation. The insulating vestibules at the ends of the heated chambers keep the heat loss to a minimum, ensuring temperature uniformity.