U.S. Mint Orders Vacuum Furnace
The furnace will pump to an ultimate vacuum of 10-2 Torr with a leak-up rate of less than 5x10-3 Torr per hour. The high-efficiency hot zone consists of four layers of ½-inch-thick, high-purity graphite felt with a .040-inch-thick Flex Shield hot face. Gas quenching is provided with an external 30-hp blower and a high-efficiency, all-copper, fin-and-tube heat exchanger operating at 2 Bar. This is accomplished with a full-locking autoclave door for the vacuum chamber.