Tungsten Rod
Tungsten's unique properties as a high performance material, including a melting point of 3410° C, low vapor pressure at elevated temperatures and low coefficient of thermal expansion, make it of value in a variety of high temperature products and processes. Among them are glass-to-metal seal parts and support parts for lighting and electronics, silicon rectifier stud mounts and high temperature furnace components.
Elmet produces pure and potassium doped (WK Type) tungsten rod. The potassium doped products are targeted for use where high temperature non-sag properties are required in smaller cross sections by the lighting and electronic industries.
Availability
Tungsten rod is manufactured as random length pieces or cut to customers' desired lengths in diameters ranging from .020 inches to .750 inches. Standard diameter and length tolerances are listed in the accompanying tables. Other, closer tolerances can be quoted on request. In addition, there are three different surface processes or finishes which are provided, depending upon the desired end use.
Composition
Pure Tungsten Products Data Sheet.pdf
Tungsten Non-Sag Round Products Data Sheet.pdf
Physical, Mechanical and Chemical Properties of Tungsten
Tungsten-Physical & Mechanical Properties Data Sheet.pdf
Tungsten Chemical Interactions.pdf
Surface Finish
Black - Surface is "as swaged" or "as drawn"; retaining a coating of processing lubricants and oxides.
Cleaned - Surface is chemically cleaned to remove all lubricants and oxides.
Ground - Surface is centerless ground to remove all coating and to achieve precise diameter control.
Tungsten Rod Standard Diameter Tolerances (Inches) |
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Diameter |
Black/Clean |
Ground |
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.020 to .025 |
± .001 |
±.001 |
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.025 to .070 |
± .0015 |
±.001 |
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.070 to .200 |
± .003 |
±.001 |
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.200 to .250 |
± .007 |
±.001 |
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.250 to .435 |
± .007 |
±.0015 |
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.435 to .690 |
± .010 |
±.003 |
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Tungsten Rod Standard Length Tolerances (Inches) |
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Diameter |
Length |
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.500 to 12 |
12 to 24 |
>24 |
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.020 to .100 |
±.010 |
±.010 |
±.0625 |
||
.100 to .500 |
±.015 |
±.015 |
±.0625 |
||
.500 to .690 |
±.015 |
±.030 |
±.0625 |
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Tungsten "Round" Calculator