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ALD Vacuum Industries Co., Ltd. is located in Hanau, Germany. It is the world's largest manufacturer of vacuum metallurgical heat treatment systems and processes. It has become the industry standard with innovative products, advanced technology, comprehensive services and maximum flexibility.
As a leading supplier of processes and services in the fields of vacuum metallurgy and vacuum heat treatment, ALD's current status can be traced back to important entrepreneurs in vacuum technology: Wilhelm Carl Heraeus (1827-1904) and Ernst Leybold (1824-1907). Today's ALD Vacuum Technology-Ltd. traces its roots to the companies Heraeus and Leybold, and Degussa, founded in 1873 by Friedrich Ernst Roessler (1813-1883). In 1994, it was integrated into ALD Vacuum Industry Co., Ltd.