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Nextel or Silica Insulated Thermocouple Duplex Wire

High Temperature Thermocouple Wire with Nextel or Silica Yarn Fiber Insulation


Item# XT-K-20-25

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 C$360.14
5-9 C$342.13
10-24 C$324.13
25-49 C$306.12
50-99 C$288.11
100+ C$270.11

In stock

Lead Time (If not in stock): 14 weeks
High Temperature Thermocouple Wire with Nextel or Silica Yarn Fiber Insulation XT-K-20-25 XT-K-20-25
  • Ceramic Insulation Material is Overbraided on Std or SLE grade Wire
  • XC :Nextel 312 standard, rated to 1200°C (2200°F) Continuous, 1425°C (2600°F) Short Term
  • XS: Silica Yarn, rated to 1050°C (1900°F) Continuous
  • XR: Refrasil Vitreous Silica Fiber, suitable to 982°C (1800°F)

XT-K-20-25 Model Options

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Edit these specs to order a different model. Not all combinations are valid. Options compatible with previous selections will be in bold.

*Highlighted options are not compatible. Please select a different combination.

Temperature Max
Temperature Range
Thermocouple Calibration Type
Wire Gauge
Conductor Insulation
Cable Length
Additional Feature
Overall Insulation
Overbraiding Type
Special Limit of error
Color Code Standard
Temperature Unit
Temperature Min
Conductor type
Cable Type
Number of Pairs

Nextel insulation a high temperature ceramic is offered with in three types of overbraiding. XC is the standard braid, XT is a tight braid and XL is a loose braid. The three braids affect only the amount of Nextel used, not the overall temperature rating. Insulation is braided over each wire or leg then a final jacket of the same insulation is braided over the pair of wires.

XC4: Nextel 440 insulation has the highest temperature rating to 1375C (2500F)

Silica insulation is a high purity (SiO2 > 99%) ceramic yarn, that offers high temperature protection up to 2000°F at an economical price. Refrasil insulation is a vitreous silica fiber.

Inconel 600 ,304SS or Tinned Copper can be added and overbraided as the outer jacket over the Nextel insulation . This type of durable outer jacket can add abrasion protection and signal shielding.
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Rated 5 out of 5 by from Great quality The product we received was great quality and exactly what we need to get the job done.
Date published: 2024-02-20
Rated 5 out of 5 by from Good Thermocouples Easy to use. Tried several thermocouples for high temperature measurement, this turned out to be the best and most accurate.
Date published: 2023-08-07
Rated 5 out of 5 by from EXCELENTE Calidad, buena atencion y acompañamiento en compra
Date published: 2023-07-26
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What is the density for part number XC4-K-24?

Asked by: Lu22
Hi Lu22, Thank you for the inquiry. This product does not have a rated density. From the wire spec page you can find the weight / 1000 ft spool and the nominal OD. Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2022-12-29

Hi, may you explain the durability difference post heating, between: high temp glass, silica, vitreous silica, and nextel ceramic? Specifically 700C exposure. Most ceramic fiber insulation I've used starts to fall apart after exposure. Thank you!

Asked by: Abraham
Hi Abraham High temperature glass ( HH ) is rated to 704 C and can be used without stainless steel or Inconel over braid. Over braid is available if exposed to abrasive or repeated bending conditions. It is recommended to use over braid to maintain integrity of the Nextel ceramic and silica fibers. Best regards,
Answered by: NorwalkAE_RS
Date published: 2024-03-18

Is it durable enough to use it(XC-4) at least 50 times with inconel overbraid? One time usage is considered as increasing temp up to 750 and 04 hours of soaking time at 750 °C and again lowering temp to room temp.

Asked by: Anonymous1
Thank you for the inquiry. The XC-4 can handle this with the inconel over braid. The XC and XS can also take this temperature with inconel over braid. Best regards OMEGA
Answered by: NorwalkAE_RS
Date published: 2021-05-04
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