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Caldor provides high-performance electric heating elements manufactured and supplied using FeCrAl resistance alloys, suitable for a wide range of industrial heating applications. These elements operate reliably across broad temperature ranges—from low-temperature processes up to 1,850 °C (3,360 °F)—and perform consistently in various atmospheric conditions.

Designed for high oxidation resistance, thermal stability, and long service life, FeCrAl heating elements are used in furnaces, kilns, ovens, and thermal processing equipment where durability and precise temperature control are critical. In addition to in-house manufacturing, we also offer material and element supply solutions, with custom designs, power ratings, and configurations adapted to specific process requirements.

Molybdenum Disilicide (MoSi₂) High-Temperature Heating Elements 

Electric molybdenum disilicide (MoSi₂) industrial heating elements are designed for demanding high-temperature applications where maximum performance and reliability are required. These elements operate effectively in a wide range of atmospheres—including oxidizing, inert, carburizing, nitriding, and reducing environments—and can withstand temperatures of up to 1,850 °C (3,360 °F).

They are characterized by stable electrical resistance over time, compatibility between new and existing elements in series connections, rapid thermal cycling without performance degradation, and an exceptionally long service life compared to other electric industrial heating technologies. As a result, MoSi₂ heating elements are widely used in industrial furnaces to improve process stability, increase productivity, reduce operating costs, and deliver a fast return on investment.

Silicon Carbide (SiC) 

High- Temperature Heating Elements

Silicon carbide (SiC) heating elements provide powerful and reliable electric heating for industrial applications with element temperatures of up to 1,625 °C (2,957 °F). They are available in a wide range of standard sizes, geometries, and fully customizable designs, allowing precise adaptation to different furnace types and process requirements.

SiC heating elements are known for their high power density, self-supporting mechanical structure, and ability to deliver uniform and well-controlled heat distribution. Typical designs cover diameters from 10 mm to 55 mm, hot zone lengths of up to 4.2 m, and overall element lengths ranging from 100 mm to 6 m, making them suitable for both compact and large-scale industrial furnaces.

These characteristics make silicon carbide heating elements a proven and dependable solution for high-temperature processes requiring durability, thermal stability, and consistent performance over long operating cycles.

Metallic Heating Elements 

Metallic heating elements manufactured from FeCrAl and NiCr resistance alloys are designed for reliable operation across a wide temperature range, from 50 °C up to 1,425 °C. They are available in wire, ribbon, and strip forms, allowing flexible designs for various industrial and domestic furnace configurations.

FeCrAl-based elements offer higher maximum operating temperatures, longer service life, excellent oxidation resistance, and material efficiency, while NiCr-based elements provide very good mechanical strength at high temperatures, making them suitable for suspended or mechanically demanding designs. Together, these metallic heating elements ensure durability, energy efficiency, and stable performance in modern thermal processing applications.

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MoSi₂ Heating Elements – Element Grades Overview

Molybdenum disilicide (MoSi₂) heating elements are available in multiple grades, each engineered for specific atmospheres, temperature ranges, and process demands in high-temperature industrial applications.

These grades combine metallic conductivity with ceramic stability, making them suitable for extreme high-temperature applications.

  • Maximum operating temperatures up to 1,900 °C
  • Excellent electrical conductivity and corrosion resistance
  • Stable performance in oxidizing and inert atmospheres
  • Suitable for continuous and batch furnace operations
  • Used in advanced industrial thermal processing

This grade is designed to combine alumina-forming behavior with the high-temperature capability of MoSi₂ technology.

  • Maximum operating temperature up to 1,580 °C
  • Suitable for oxidizing, inert, and reducing atmospheres
  • Improved resistance to chemical attack
  • Ideal for applications requiring balanced durability and temperature capability

This grade is specifically engineered for applications operating in nitrogen atmospheres at elevated temperatures.

  • Designed for use above 1,250 °C in nitrogen
  • Prevents degradation caused by nitridation
  • Extended service life compared to standard MoSi₂ elements
  • Suitable for controlled atmosphere furnaces

This grade is optimized for clean and contamination-free heating processes, particularly in sensitive industries.

  • Maximum operating temperature up to 1,800 °C
  • Low particle generation and clean thermal behavior
  • Suitable for research, electronics, and laboratory furnaces
  • Stable resistance and uniform heat output

This grade is designed for applications involving frequent heating and cooling cycles, where mechanical stability is critical.

  • Maximum operating temperature up to 1,830 °C
  • Improved hot strength and form stability
  • Optimized for furnace temperatures between 1,500 – 1,750 °C
  • Extended lifetime under thermal cycling conditions

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Silicon Carbide (SiC) Heating Element Types

Silicon carbide heating elements are available in multiple structural designs, each optimized for specific furnace layouts, temperature ranges, and process requirements in high-temperature industrial applications.

Rod-type silicon carbide elements are the most basic and widely used form. They are manufactured as round-section rods or tubes.

  • Available diameters from 10 mm to 55 mm
  • Can be installed vertically or horizontally
  • Rigid structure maintained even at maximum operating temperatures
  • No special mechanical supports required
  • Fast replacement possible, even while the furnace is hot, minimizing downtime

Multi-leg silicon carbide elements consist of two, three, or four SiC legs, each divided into a hot zone and cold end to optimize electrical and thermal performance.

  • Legs are resistance-matched for uniform load distribution
  • Connected by silicon carbide bridges forming a monolithic structure
  • Bridges are outside the hot zone and may act as end supports
  • Two-leg designs operate as single-phase units
  • Multiple elements can be combined for balanced three-phase systems
  • Type CU variants feature a shortened bridge for space-constrained installations

Type B silicon carbide elements are designed for simplified installation and improved temperature uniformity in industrial furnaces.

  • Suitable for lift-off roofs and narrow furnace channels
  • Ideal for launders, feeders, and wide roof or wall installations
  • Supports stable thermal distribution across large furnace areas
  • Designed for ease of maintenance and replacement

These silicon carbide elements are engineered specifically for float glass production environments.

  • Designed for use in tin baths for flat glass manufacturing
  • Suitable for architectural, automotive, and solar glass applications
  • Service life can extend up to 18 years under controlled conditions
  • Available with special glazed surfaces resistant to volatile attack
  • Horizontal elements can be replaced while the furnace remains in operation

SG and SR elements are produced using a reaction-sintering process, resulting in dense, oxidation-resistant silicon carbide material.

  • Lower porosity compared to conventional SiC elements
  • Improved resistance to chemical and atmospheric reactions
  • Operating temperature range from below 600 °C up to 1,600 °C
  • Suitable for air and controlled atmospheres
  • Capable of handling higher electrical loads than metallic heating elements
  • Ideal for continuous and intermittent furnace operation

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Metallic Heating Elements

Metallic heating elements are engineered for a wide range of industrial and domestic heating applications, covering element temperatures from 50 °C up to 1,425 °C. Depending on the operating temperature, furnace atmosphere, and mechanical requirements, elements can be produced from FeCrAl or NiCr resistance alloy families in wire, ribbon, or strip forms, ensuring high adaptability for different furnace designs.

FeCrAl-based metallic elements are preferred for higher operating temperatures and long service life. They form a protective oxide layer that supports clean operation and stable performance in demanding furnace environments.

  • Maximum element temperature: up to 1,425 °C
  • Service life: extended lifetime, reduced replacement frequency
  • Material efficiency: high resistivity and lower density enable lighter designs
  • Oxidation resistance: protective oxide layer reduces scaling and contamination risks
  • Design flexibility: supports higher surface loads and advanced geometries

Recommended when higher operating temperature capability and clean oxidation behavior are key priorities.

NiCr-based elements are selected where excellent hot-state mechanical properties, ductility, and creep strength are required—particularly for suspended coil designs and mechanically demanding installations.

  • Typical maximum element temperature: up to 1,250 °C
  • Mechanical strength: strong ductility and creep resistance at elevated temperatures
  • Best fit: suspended coils and applications needing high hot-strength stability
  • Process reliability: stable performance where mechanical loading is critical

Recommended when mechanical integrity at operating temperature is the primary requirement.

Requirement Recommended Choice
Higher maximum temperature capability FeCrAl
Longest service life and reduced maintenance FeCrAl (application-dependent)
Excellent hot-state ductility & mechanical stability NiCr
Suspended coil designs / mechanically demanding layouts NiCr
Clean operation with protective oxide layer behavior FeCrAl

We support projects from specification to delivery, ensuring the metallic heating element design matches the thermal duty, furnace atmosphere, insulation concept, and installation constraints.

  • Selection support: alloy family, element type, support system, and insulation concept
  • Supply of fully assembled elements, ready for installation
  • Retrofit and upgrade solutions for both electric and gas-heated furnaces (heat package modernization)
  • Short lead times for custom specifications (depending on geometry and materials)

Metallic heating elements can be manufactured to specification in a wide range of configurations, including:

  • Coiled elements: spiral coils, edge-wound coils
  • ROB / Meander elements: rod-over-bend and meander strip layouts
  • Cartridge-style assemblies: bundle rod elements, cage elements
  • Tubular-type metallic elements: metal-sheathed formats for specific layouts

Final design is defined based on target temperature, furnace atmosphere, available space, electrical supply, and mounting requirements.

Share your furnace operating temperature, atmosphere, available installation space, and electrical supply. Our engineering team will propose the most suitable alloy family and element geometry for reliable, efficient, long-term operation.