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Properties

Tantalum is a rare metal with a steel gray luster, a melting point of 2980°C and a density of 16.6 g/cm³. Tantalum is a very stable chemical element with similar properties to niobium. Tantalum is ductile and can be drawn into fine wire or made into thin foil. Its coefficient of thermal expansion is very small, expanding by only 6.6 parts per million per degree Celsius. In addition, it is very ductile, more so than copper.
Tantalum also has excellent chemical properties and is extremely resistant to corrosion. It does not react to hydrochloric acid, concentrated nitric acid or "aqua regia" under either cold or hot conditions. At room temperature, tantalum does not react to alkaline solutions, chlorine gas, bromine water, dilute sulfuric acid and many other agents, but only to hydrofluoric acid and hot concentrated sulfuric acid.

Brand name:	RO5200
	RO5400
	RO5252(Ta-2.5W)
	RO5255(Ta-10W)
purity:	99.95％，99.99％
Implementation standards:	ASTM B 708

Material	Ta
Specification	Thickness(mm)	Width(mm)	Length(mm)
	0.03~1.5	5~1000	50~3000
	≥1.5	50~1500	–
Density	16.68.g/cm3
Grade	Ta1

Atomic number	73
CAS number	7440-25-7
Atomic mass	180.95 [g/mol]
Melting point	2996 °C
Boiling point	5458 °C
Density at 20 °C	16.65 [g/cm³]
Crystal structure	Body-centered cubic
Coefficient of linear thermal expansion at 20 °C	6.4 × 10^-6[m/(mK)]
Thermal conductivity at 20 °C	57.5 [W/(mK)]
Specific heat at 20 °C	0.14 [J/(gK)]
Electrical conductivity at 20 °C	8.0 × 10⁶[S/m]
Specific electrical resistance at 20 °C	0.125 [(Ωmm²)/m]