Type C and D bare thermocouple wire

Type C and Type D thermocouple wires have been developed to facilitate ultra-high temperature measurement in vacuum, reducing or inert atmospheres.

These thermocouple wires are both Tungsten Rhenium alloys. Type C is Tungsten 5% Rhenium vs Tungsten 26% Rhenium. Type D has a slightly different composition: Tungsten 3 % Rhenium vs Tungsten 25% Rhenium. Both of these thermocouples can be used for guaranteed temperature measurement up to 2871°C.

Our standard type C and D wire items

Please contact us if you need different diameters. We can supply more custom made diameters (combinations) than stated below.

Type C and D thermocouple wires are rather difficult to process into a sensor. Maybe a complete sensor will fit your needs better? Visit our high-temperature thermocouple page. On that page, complete assemblies are explained, and through the dedicated brochure, you can directly configure one.

Thermocouple Class Outside Diameter in mm Delivery time
Type C
Type D
ASTM E 230 Standard limits 0.076 mm 1 week Send inquiry
Type C
Type D
ASTM E 230 Standard limits 0.127 mm 1 week Send inquiry
Type C
Type D
ASTM E 230 Standard limits 0.198 mm 1 week Send inquiry
Type C
Type D
ASTM E 230 Standard limits 0.254 mm 1 week Send inquiry
Type C
Type D
ASTM E 230 Standard limits 0.381 mm 1 week Send inquiry
Type C
Type D
ASTM E 230 Standard limits 0.30 mm 1 week Send inquiry
Type C
Type D
ASTM E 230 Standard limits 0.50 mm 1 week Send inquiry
Type C
Type D
ASTM E 230 Standard limits 1.00 mm 1 week Send inquiry

Delivery times stated are workingsdays with delivery to Kamet’s warehouse

How can we help you today?

Request a quotation for the wire and quantity you need for your project.

High quality type C and D thermocouple bare wire

Kamet offers a variety of high quality Type C and Type D thermocouple with two to four week delivery time. Our products offer the following advantages:

  • EMF is tested at finished wire size and for each coil individually, not in batches
  • EMF is tested up to 2300°C (4200 F)
  • Full traceability and certification to NIST standards
  • Certifications are user-friendly, with deviations indicated in mV, °F, or °C
  • Wire sizes 0.0127 to 1 mm diameter and larger diameters are available.
  • Type C and Type D wires are supplied at both standard and customized lengths with no upper limit.
  • The thermocouple wires are doped which ensures superior ductility in comparison to un-doped materials.
  • Extra services are available such as:
    • Customized EMF tolerances and sizes for critical applications
    • The recording of calibration data from both ends of long-length spools (end to end) instead of an average
0.020 inch wire of type C and D

What are the differences between thermocouples Type C and Type D?

These two thermocouples are very similar in composition, ductility and performance. The only slight differences are that the average EMF of Type D is marginally higher than that of Type C. Furthermore, Type C is the only ASTM approved tungsten thermocouple while “Type D” is in fact an industry term and not an official standard thermocouple letter designation.

Type C (W5Re/W26Re) thermocouples are by far the most commonly used. However, there are some applications where Type D is specifically requested by customers.

Physical Properties of Tungsten Rhenium Alloys

Read here the mechanical and physical properties of the Tungsten Rhenium Alloy.

Industrial uses of Tungsten Rhenium Alloys

Tungsten thermocouples are the ideal choice for high temperature vacuums as well as either reducing, dry neutral, and oxidizing atmosphere. They are specifically selected for temperatures and conditions beyond the capabilities of platinum. Avoid usage of Type C and Type D thermocouple wires in the presence of elevated temperatures in reducing, dry Neutral, and oxidizing atmosphere due to embrittlement.

Vacuum furnaces at extreme temperatures are one of the most common applications of these thermocouples. Others include:

  • Aerospace
  • (Solar) Power generation
  • Semiconductor processing and equipment
  • (Medical) Research
  • Military
Brochure of Thermocouple wire type C and D

Download the Type C and Type D datasheet

Consult the type C and D datasheet for more technical information. Fill out the form and you can download the datasheet immediately.

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Kamet and Concept Alloys

Based in the United States and founded in 2002, Concept Alloys is our partner for Tungsten Rhenium thermocouple wire. Concept Alloys are widely known for their proprietary testing and calibration methodologies used to routinely calibrate each end of every coil produced. This expertise and commitment to quality is further reflected in the fact that every finished coil has to meet their own end-to-end uniformity tolerance every 100°C, from +100°C to +2300°C. They have extensive experience in Tungsten Rhenium alloys and have built up unparalleled knowledge to provide great technical support. Furthermore, the company works with New Product Development teams in order to further knowledge on temperature measurement, and oxidation and corrosion resistance for Tungsten Rhenium alloys.

This commitment to quality, the focus on in-house expertise and innovative approach matches the business ethic of Kamet perfectly.

Kamet furthermore offers her customers:

  • Excellent customer service via phone or mail. Our multilingual team will ensure you receive a response within 24 hours.
  • Kamet provides 24 hour access to a large range of products via our customer portal as well as extensive product information on the customer portal.
  • Our expert technical sales engineers are available to work with you in finding the best (custom) product for your situation.

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