Tantalum Properties

tantalum mechanical physical properties specifications chemistry

When selecting a refractory metal to best meet the requirements of your application, the physical properties are of the utmost importance. Below are tables with data containing Tantalum’s typical properties, including chemistry and pertinent specifications.  If you require any additional information on Tantalum, please complete our Contact Us form or call us.


For an EFINEA Tantalum data sheet, or any other Refractory Metals & Alloys data sheets, please go to the Data Sheets section in our Technical Library.

Tantalum Typical Physical Properties

Melting Point°C2996
Electrical ConductivityS/m8.0 x 106
Specific Electrial Resistance(Ωmm2)/m0.125
Thermal ConductivityW(mK)57.5
Specific Heat @20°CJ/(gK)0.14
Coefficient of Linear Thermal Expansionm/(mK)6.4 x 10-6
Source: Plansee, www.plansee.com

Tantalum Typical Mechanical Properties

Ultimate Tensile Strength*psi (MPa)25,000 (172)
Yield Strength min.*psi (MPa)15,000 (103)
Elongation min.*% 1.0" in25
Vickers HardnessMPa870-1200
Modulus of Elasticityksi (GPa)27 (186)
*Based on Rod 0.125" to 2.5" Diameter Annealed | Source: ASTM B365, Table 3; Plansee, www.plansee.com

Tantalum Chemistry

Minimum % 99.95

Tantalum Specifications

(Bar, Wire)
(Plate, Sheet, Strip)
AMS 7849UNS R05200

For additional information on specifications of the materials distributed by EFINEA, please visit the websites of the international organizations that develop and publish technical standards: ASTM International and ASM International.

EFINEA is the leading supplier of controlled expansion, refractory, soft magnetic  metals & alloys and electronic nickels for the aerospace, aviation, communications, defense, energy, electronic, medical, research and other high technology markets.