Tantalum (Ta) Capillary / Tantalum Micro Tube


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Tantalum capillary, also named tantalum micro tubing and tantalum fine tube, is the tantalum tube with very small dimensions. It can be used as the filament lead tube of the cathode insulator in an x-ray tube, as a marker band in medicine, and can be used as a thermocouple tube.

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Data sheet

Purity99.95% ,99.99%
MaterialTa, Ta10W, Ta2.5W, Ta40Nb,UNS R05200, R05400, R05255, R05252, R05240
ConditionAnnealed, Unannealed

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HM provides high-quality Tantalum (Ta) Capillary at a competitive price, which can be used in Scientific research or industrial production. The most common applications of tantalum capillary tubes are marker bands and thermocouple protection tubes.

Application of Tantalum Capillary / Tantalum Micro Tube

  • Used in laboratory equipment.
  • Used as a substitute for platinum.
  • Used as the filament lead tube of the cathode insulator in an x-ray tube. 
  • Used in liquid tantalum electrolytic capacitors.

Tantalum Capillary Specification

Catalog No.



Outer Diameter (OD): 0.2~8mm

Wall Thickness (WT): 0.015 ~ 1mm

Length (L): 1mm~1000mm

Tolerance: OD, +/-0.003mm. WT, +/-0.005mm. L, +/-0.05mm


>=99.95% or 99.99%

For larger Tantalum tubing, please check tantalum & tantalum alloy tubes.


Tantalum Capillary Chemical Composition

Elment C O N H Fe Mo Nb Ni Si Ti W
R05400 (%,Max)
R05255 (Ta10W) (%,Max)0.010.0150.010.00150.–11.0
R05452 (Ta2.5W) (%,Max)0.010.0150.010.00150.–3.5
R05240 (Ta-40Nb) (%,Max)–

Tantalum Capillary Ordering Information

Orders for material under this specification shall include the following information:

  • Quantity
  • UNS grade (See above Tantalum and Tantalum Alloy UNS Grade)
  • Type (welded or seamless)
  • Dimensions (OD, ID, L or OD, WT, L or ID, WT, L)
  • Nondestructive test requirements, if any
  • Additions to the specification and supplementary requirements, if any

Tantalum Capillary Packing:

Our Tantalum capillary will be packed in the wooden case supported with soft materials to ensure that the products thus packed will not shift inside the cases.

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