Tungsten, molybdenum and heatspreader materials

Processed products, etc.

Tungsten and molybdenum have a high melting point, low coefficient of thermal expansion and are extremely stable in vacuum. They are used widely in electronics and other fields for electrodes, heat and radiation shielding and lighting.

Our tungsten and molybdenum products are made directly from raw materials under strict quality control using high quality analytical instruments and rigorous evaluation of the production process.

In addition, we offer a variety of sizes and types of powder and variations on finishing and processing to provide the highest performance in every application.

Processed products, etc.

Characteristics of W and Mo Tungsten (W) Molybdenum (Mo)
Physical
properties
Atomic number 74 42
Atomic weight 183.85 95.94
Crystal structure Body-centered cubic lattice Body-centered cubic lattice
Lattice constant(A) 3.1647(20℃) 3.146(21℃)
Melting point(℃) 3410±10 2620±10
Boiling point(℃) Approx. 5900 4827
Density(g/cm3) 19.3 10.2
Electrical resistance
(μΩ・cm)
5.5(20℃) 5.78(27℃)
Coefficient of linear
expansion(10-6/℃)
4.44(27℃) 5.1(27℃)
Chemical properties
  1. Appreciably stable at ordinary temperatures, but oxidizes to such an extent that the surface gloss is lost. Reacts mainly with O2, CO, N2, H2O and hydrocarbon at high temperatures, but does not react with mercury vapor and hydrogen.
  2. Makes higher oxide (WO3) through lower oxide, such as W3O, WO2 and W20O58, with increasing temperatures when reacting with oxygen or air.
  3. Unaffected by water, but affected by water vapor in a red-hot state to make WO3.
  4. Drastically reacts with a mixed solution of nitric acid and hydrofluoric acid.
  5. Has reducibility at searing temperatures. Makes compound (WS2) upon ignition with sulfur, and forms compound (W3P4) when passed through phosphorus vapor.
  1. Does not react with dry oxygen at ordinary temperatures, but rapidly oxidizes at 500℃ or above.
    Becomes white-mouse-gray volatile M0O3 at 650℃ or above.
  2. Easily combines with sulfur, carbon or silicon at high temperatures to make MoS2, Mo2C and MoSi2.
  3. Has a strong affinity to arsenic.
  4. Hardly affected by hydrofluoric acid, hydrochloric acid and sulfuric acid at 20℃, but severely affected by nitric acid, mixed solutions of high-concentration sulfuric acid and aqua regia.