Sale! Molybdenum Disc & Molybdenum Square (Mo Disc & Mo Square)-heegermaterials View larger

Molybdenum Disc & Molybdenum Square (Mo Disc & Mo Square)


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Molybdenum Disc has the characteristics of high melting point, good strength, stable chemical composition, excellent processing performance, excellent conductivity and corrosion resistance, and small linear expansion coefficient. At present, the molybdenum circle is the best basic material for thyristor rectifier components.

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Data sheet

MaterialsMolybdenum metal/TZM/MoLa Alloy
StandardASTM B386

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Molybdenum disc includes pure molybdenum disc and coated molybdenum disc. Coated molybdenum disc is PVD or evaporation with Ruthenium (Ru), Rhodium (Rh), Nickel (Ni), Silver (Ag), Gold (Au), etc. Molybdenum discs are widely used as contact materials in silicon-controlled rectifier diodes, transistors, and thyristors. Molybdenum has similar coefficients of thermal expansion (CTE) to silicon combined with moderate thermal conductivity and is therefore appropriate for large area power devices where considerable heat is generated. Additional applications include the utilization of molybdenum as heat sink bases in IC’s, LSI’s, and hybrid circuits.

Heeger Materials (HM) is a trusted supplier of pure Molybdenum and Molybdenum alloy. We offer Molybdenum discs in various sizes. Other shapes are also available upon request.

Molybdenum Disc Specifications


Molybdenum Disc


Diameter: 1.0 mm – 150.0 mm (0.04” – 6.0”)

Thick: 0.1 mm – 12.0+ mm (0.004” – 0.5”+)


flatness<0.005mm, Parallelism<0.01mm,

Ra<0.063mm, tolerance: ±0.025mm.


Molybdenum or Molybdenum alloy including Pure Molybdenum (Type 361), Molybdenum TZM (Type 364), Mo-Lanthanoxid (ML), and Drawing grade




99.95%, 99.99%


Ru, Rh, Ni, Ag, Au etc.

Molybdenun and Molybdenum Alloy Materials

  • Pure Molybdenum Metal
  • TZM (Titanium-Zirconium-Molybdenum)
  • ML (Molybdenum-Lanthanum Oxide)

Molybdenum Disc Applications

  • Silicon Controlled Rectifiers Diodes
  • Transistors
  • Thyristors (GTO ‘s)
  • Heat Sink Bases in IC’s, LSI’s and Hybrid Circuits                    

Moly Disc and Moly Square Dimensions

Molybdenum Disc7 ~ 100mm Diameter0.25 ~ 4.0mm Thickness
Molybdenum Square25 ~ 100mm Width/Length0.5 ~ 1.5mm Thickness
Flatness Tolerance< 4um
RoughnessRa 0.8

Molybdenum Disc Packing

The Mo disc will be packed in a wooden case supported with soft materials to ensure that the products thus packed will not shift inside the cases.

packing of Heeger Materials     Molybdenum packing

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