Thermocouple Sheath

Thermocouple Sheath for High-Temperature

A thermocouple sheath is a protective tube that encases a thermocouple, shielding it from harsh environments, chemical reactions, and mechanical damage. Sheaths made from tungsten and molybdenum are engineered for exceptional heat resistance, making them ideal for use in extreme temperature settings such as furnaces, vacuum systems, and molten metal applications.

At MetalsTek, we specialize in providing high-quality thermocouple sheaths designed for reliability, accuracy, and long-lasting performance. Learn how these advanced materials can elevate your temperature measurement applications.

Tungsten Thermocouple Sheath, W

Material: Tungsten (W)

Purity: 99% ~ 99.99%

Shape: Tube with One Endcap

Size Range: Diameter 3-500mm; Thickness 0.4-30mm; Length <2,000mm

Density: >18.5 g/cc

Vickers Hardness: >450 HV

Surface: Machined, Cleaned, or Finished

Molybdenum Thermocouple Sheath, Mo

Material: Molybdenum (Mo), Mo-1, Mo-2

Purity: 99.95% Min

Standard: ASTM B386

Size Range: Diameter 0.5~600mm, Wall Thick 0.1~30mm, Length 5~6,000mm

Surface: Polished(Ra<3.2), Chemical Cleaned

Ceramic Thermocouple Sheath

Material: Aluminia, Zironia, or Customized

Shape: Tube with One Endcap, Custom Shapes

Purity: 95%, 99%, 99.9%, can be customized

Sizes: Tailored Sizes

Stainless Steel Thermocouple Sheath

Material: Stainless Steel

Alloy Type: Inconel, Duplex, Monel, Incoloy, HastelloyAus Steel, SS Steel, or Customized

Product Form: Tube with one end capped, or customized shape

Surface: Finished

Why Choose Tungsten and Molybdenum Thermocouple Sheaths?

Tungsten Thermocouple Sheaths

Exceptional Temperature Resistance: With a melting point of 3422°C (6192°F), tungsten is one of the most heat-resistant materials available. It performs flawlessly in ultra-high-temperature environments like aerospace and metallurgical processes.
Corrosion Resistance: Tungsten resists corrosion in inert and reducing atmospheres, making it suitable for use in vacuum furnaces and protective atmospheres.
Durability: Its exceptional hardness ensures minimal wear even in demanding conditions.

Molybdenum Thermocouple Sheaths

High Temperature Tolerance: Molybdenum withstands temperatures up to 2623°C (4753°F), making it perfect for environments just below tungsten’s operating range.
Thermal Conductivity: It offers superior thermal conductivity, ensuring precise and rapid temperature readings.
Oxidation Resistance: When used in vacuum or inert atmospheres, molybdenum is highly resistant to oxidation.

Detailed Thermocouple Sheath Specifications

Materials

Tungsten: Suitable for temperatures exceeding 3000°C in non-oxidizing environments.
Molybdenum: Ideal for high-heat applications up to 2623°C under controlled conditions.

Dimensions

Custom Sizes Available: Inner diameter, outer diameter, and length tailored to your specifications.

Operating Environments

Vacuum Systems
Inert Atmospheres
Corrosive and High-Pressure Conditions

Applications of Tungsten and Molybdenum Thermocouple Sheaths

Industries

Aerospace: For testing and research in jet propulsion and high-velocity systems.
Metallurgy: Temperature monitoring in molten metal processes like steel or aluminum production.
Power Generation: Used in nuclear power plants and high-temperature energy systems.
Semiconductor Manufacturing: For precise temperature control during wafer production.

Typical Uses

Furnace temperature measurement
Heat treatment processes
Monitoring molten metal baths
Ensuring accurate thermal readings in harsh chemical environments

Tungsten vs. Molybdenum: Which Should You Choose?

Property	Tungsten	Molybdenum
Melting Point	3422°C (6192°F)	2623°C (4753°F)
Corrosion Resistance	Excellent in inert/reducing atmospheres	Good in vacuum or inert atmospheres
Durability	High wear resistance	Moderate wear resistance
Best Applications	Ultra-high temperatures, aerospace	High-temperature industrial furnaces

If your process involves temperatures above 3000°C or extreme durability, choose tungsten. For cost-effectiveness in slightly lower temperatures, molybdenum is ideal.

Custom Tungsten and Molybdenum Thermocouple Sheaths

At MetalsTek, we understand that standard solutions may not fit every application. That’s why we offer:

Custom Sizes: Sheaths made to your exact dimensions.
Specialized Designs: Options for threaded ends, flanged connections, and more.
Expert Engineering Support: Work with our team to design the perfect thermocouple sheath for your needs.

How to Choose the Right Thermocouple Sheath

Assess Temperature Requirements: Determine the maximum temperature your application will reach.
Consider Environmental Conditions: Will the sheath operate in a vacuum, inert, or reducing atmosphere?
Material Compatibility: Match the material of the sheath to the environment and materials involved in the process.
Precision Needs: If rapid and precise thermal readings are critical, molybdenum is an excellent choice.

Why MetalsTek?

Unmatched Quality
We use only the highest purity tungsten and molybdenum to ensure consistent performance and durability.
Custom Solutions
Our team specializes in crafting solutions tailored to even the most demanding applications.
Fast Turnaround Times
From design to delivery, we prioritize your timeline without compromising on quality.
Global Reach
Serving industries across North America, Europe, and beyond.
Ready to enhance your temperature measurement systems with high-quality tungsten and molybdenum thermocouple sheaths? Contact MetalsTek today for expert advice, custom solutions, and a quote tailored to your needs.
Request a Quote Now or email us at sales@metalstek.com

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Thermocouple Sheath