A platinum rhodium tube is a type of tube made from a combination of platinum and rhodium metals. This alloy is known for its high melting point, corrosion resistance, and excellent thermal conductivity. Platinum rhodium tubes are commonly used in high-temperature applications, such as in the production of thermocouples and in laboratory equipment. They are also used in the manufacturing of glass and fiber optics, as well as in the chemical industry for processes that involve corrosive substances.