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Calrod Heating Elements
High-Performance Tubular Heating Solutions for Industrial Applications
Calrod heating elements are heavy-duty tubular electric heaters engineered for reliable, efficient heat transfer in air, liquid, and solid heating systems. Built with a resistance wire core compacted in high-purity magnesium oxide (MgO) and protected by a durable metal sheath, these elements deliver excellent thermal conductivity, mechanical strength, and long service life.
We manufacture fully customized Calrod heating elements for industrial OEM and process heating applications worldwide.
Product Overview
A Calrod heating element consists of:
- Resistance Wire (NiCr Alloy) – Generates heat through electrical resistance.
- High-Purity MgO Insulation – Provides electrical insulation and superior heat transfer.
- Metal Sheath – Protects the internal structure and transfers heat to the medium.
- Cold Pins & Terminals – Secure electrical connections for safe operation.
This compacted tubular construction ensures:
- Uniform heat distribution
- High dielectric strength
- Excellent vibration resistance
- Long operational lifespan
Product Types
We offer a complete range of Calrod heating configurations:
Straight Calrod Heating Elements
- Linear heating applications
- Industrial ovens
- Packaging machinery
- Hot plates
Finned Calrod Elements
- Air duct heaters
- HVAC systems
- Forced air heating
- Increased heat dissipation area
Immersion Calrod Elements
- Direct liquid heating
- Water, oil, chemical tanks
- Threaded or flange mounted designs
Custom Bent Tubular Heaters
- Multi-plane bending
- Complex equipment layouts
- Mold and platen heating
Technical Specifications
| Parameter | Standard Range |
|---|---|
| Voltage | 110V – 480V (Custom Available) |
| Power | 100W – 20kW |
| Diameter | 6mm / 8mm / 10mm / 12mm / 16mm |
| Sheath Material | SS304 / SS316 / Incoloy 800 / Incoloy 840 |
| Insulation | High-Purity Magnesium Oxide |
| Maximum Temperature | Up to 800°C |
| Watt Density | Custom Engineered |
| Tolerance | ±5% Power |
Sheath Material Options
Stainless Steel 304
- Standard industrial environment
- Air heating applications
Stainless Steel 316
- Corrosion resistant
- Suitable for water and mild chemicals
Incoloy 800 / 840
- High temperature oxidation resistance
- Long service life in elevated temperature environments
Material selection depends on: Operating temperature\\ Heating medium\\ Corrosive conditions\\Required lifespan
Material Selection & Engineering
Our engineering team provides:
Watt density calculation
Thermal load analysis
3D CAD drawings
Resistance configuration design
Terminal selection optimization
Sheath material recommendation
- Engineering Design Capabilities
Our engineering team provides comprehensive thermal solutions:
Watt density calculation
Thermal load analysis
3D CAD drawings
Resistance configuration
Terminal optimization
Sheath recommendation
Industrial Applications
Calrod heating elements are highly versatile and widely used across various heavy-duty and precision industrial sectors:
Industrial Ovens
Plastic processing machinery
Tank heating systems
Oil preheating systems
Food processing equipment
HVAC air duct heating
Chemical processing systems
Mold and platen heating
Performance Advantages
- High heat transfer efficiency
- Excellent electrical insulation
- Durable under vibration
- Compact structure
- Flexible bending capability
- Suitable for high watt density design
- Long service life
Manufacturing & Customization
Manufacturing & Quality Control
Our advanced MgO compaction process ensures high insulation resistance, stable heating performance, and minimal moisture absorption. Each element undergoes strict testing:
Resistance & Insulation testing
High voltage dielectric testing
Dimensional inspection
Surface finish inspection
Customization Options
We provide full OEM and ODM manufacturing tailored to your exact application requirements. We support:
Custom voltage & power ratings
Special bending shapes & geometries
Flange or threaded fittings
Waterproof & Explosion-proof terminals
High-temperature lead wires
Frequently Asked Questions
What is the difference between calrod and tubular heating elements?
Calrod is a commonly used term referring to compacted tubular heating elements constructed with resistance wire and MgO insulation inside a metal sheath.
How to determine proper watt density?
Watt density depends on heating medium, temperature requirement, and circulation conditions. Our engineers assist in selecting the correct design.
What is the typical service life?
Service life varies by operating conditions but is significantly extended with proper watt density and sheath selection.
Can you manufacture based on drawings?
Yes. We manufacture according to customer technical drawings or provide design assistance if needed.
Request Engineering Support
For accurate quotation and design optimization, please provide us with your specifications (Voltage, Power, Dimensions, Medium, Temp, and Installation method).
Our engineering team will deliver a complete heating solution including technical drawing and quotation.