The melting point of molybdenum is 2620℃. Due to the strong interatomic bonding force, the strength is very high at room temperature and high temperature. It has small expansion coefficient, high conductivity and good thermal conductivity. It does not react with hydrochloric acid, hydrofluoric acid and alkali solution at room temperature, but only dissolves in nitric acid, aqua regia or concentrated sulfuric acid. It is also quite stable to most liquid metals, non-metallic slag and molten glass.

Molybdenum has many advantages, such as high melting point and boiling point, good high temperature strength, anti-friction and corrosion resistance, high thermal conductivity, small thermal expansion coefficient and good hardenability, which make it widely used in aerospace, weapons, electronics, glass and other fields. In recent years, the annual consumption of molybdenum metal in China glass industry is about 40 tons, and its consumption is still on the rise.

Molybdenum is widely used in the production of fiberglass, quartz glass, flat glass and TV glass shells. The amount of molybdenum used in glass fiber production is large, accounting for about 75% of the total amount of molybdenum used in glass industry. The annual production of quartz glass requires about 25 molybdenum crucible and consumes about 6 tons of molybdenum material. The annual production of glass shell requires about 5 tons of molybdenum for molybdenum agitator. In addition, some bottle glass, bulb glass, thermos flask production also uses molybdenum electrode as heater.

Molten glass corrodes most metals, except molybdenum and platinum. Platinum is so expensive that molybdenum or molybdenum alloys containing 30% tungsten are often used instead as electrodes in glass furnaces. http://www.timjarnold.com