Calculators
Ohm's Law – Single
Ohm's Law – Triple (Delta)
Ohm's Law – Triple (Wye)
Heat Energy Requirements
Wattage Requirements
Glossary
  • Cartridge Heaters

    Magnum™ cartridge heaters are swaged designs, made for use in applications where high watt density, high temperatures and long service life are critical to minimize mold service downtime and expensive press open time. The swaged construction produces a highly compacted unit that resists shock and vibration, while providing for maximum element life through efficient transfer heating. They last up to 20 times longer than uncompacted cartridge heaters. UL/CUL Component Recognition Available. Durex will also custom manufacture to your specifications.

    Visit our Online Store, it's an easy and convenient way to order Cartridge Heaters. Hundreds of standard designs available.

    Contact us for Engineering Assistance.

    Product Overview

    Cartridge Heater Design Features

    • UL/CUL component recognition available
    • Rugged dependable heat source
    • Temperatures up to 1500°F (820°C)
    • Many diameters offered as standard
    • Metric sizes also available
    • Highly compacted unit which resists shock and vibration
    • Alloy sheath for high corrosion resistance
    • Custom manufactured to specifications

     

    More Products In This Section

    • Cartridge Heater Product Selector
      Cartridge Heater Product Selector
      Hundreds of standard Magnum™ cartridge heaters available for quick ship.  Engineering assistance available to discuss your application and help with your selection.  Call 866-712-5014.
    • 1/8th Inch Cartridge Heaters
      1/8th Inch Cartridge Heaters
      The 1/8th Inch (3.175 mm) Magnum™ Cartridge Heater was developed for Original Equipment Manufacturers (OEMs) that required a small but high power thermal solution.
    • Cartridge Heaters, Swaged Flexible Leads
      Cartridge Heaters, Swaged Flexible Leads
      Fiberglass insulated leadwires are internally connected to nickel pins. This design allows for much greater flexibility at the lead exit point from the heater. 
12" Lead are standard. 
Specify longer leads if required. 
 Standard cold length at lead exit: 0.375"  
Standard cold length at disc end: 0.25"   NEED…
    • Cartridge Heaters, Straight Armor Cable
      Cartridge Heaters, Straight Armor Cable
      Armor cable over fiberglass insulated leadwire 
exits straight from heater sheath for heavy duty 
lead protection. 
3” lead beyond armor is standard. 
Specify longer lead if required. 
Specify galvanized or stainless steel 
armor when ordering.   NEED IT FAST? Available for quick ship.  To order please visit our Online Store.
    • Cartridge Heaters, Straight Braid Leads
      Cartridge Heaters, Straight Braid Leads
      Stainless steel braid over fiberglass insulated leadwires exits straight from heater sheath for abrasion resistance, yet is flexible enough for sharp bends. 
3” additional lead beyond braid is standard. 
Specify longer lead if required. 
 Standard cold length at lead exit: 0.375” 
 Standard cold length at disc end: 0.25”…
    • Cartridge Heaters, Standard Leads
      Cartridge Heaters, Standard Leads
      Fiberglass insulated leadwires are internally connected to nickel pins. This design allows for great flexibility at the lead exit point of the heater. 
12” leads are standard. 
Specify longer leads if required. 
 Standard cold length at lead exit: 0.375” 
 Standard cold length at disc end: 0.25”
    • Cartridge Heaters, Teflon Leads & Seal
      Cartridge Heaters, Teflon Leads & Seal
      Teflon® insulated leadwires with Teflon® end seal swaged into the cartridge heater sheath provides a superior moisture and chemical resistance. This design requires at least a 1” cold section at the lead exit end of the heater. 
12" Leads are standard. 
Specify longer leads if required. 
Specify "E" for epoxy…
    • Cartridge Heaters, Right Angle Leads
      Cartridge Heaters, Right Angle Leads
      Fiberglass insulated leads exit the heater sheath at a right angle for easier access and routing. Includes stainless steel end cap and high-temperature potting. Specify overall length of heater.
    • Cartridge Heaters, Right Angle Braid Leads
      Cartridge Heaters, Right Angle Braid Leads
      Stainless steel braid over fiberglass insulated leadwires exits at right angle from heater sheath. Includes stainless steel end cap. 
3" lead beyond braid is standard. 
Specify longer lead if required. 
Specify overall heater length when ordering.
    • Cartridge Heaters, Right Angle Armor Cable
      Cartridge Heaters, Right Angle Armor Cable
      Stainless steel flexible armor cable over fiberglass insulated leadwires exits at right angle from heater sheath. Includes stainless steel cap. Galvanized or stainless steel armor. 
3” lead beyond armor is standard. 
Specify longer lead if required. Specify: galvanized 
or stainless steel armor; overall heater length.
    • Cartridge Heaters, Internal Thermocouple
      Cartridge Heaters, Internal Thermocouple
      A Type J thermocouple provides integral temperature control. The reference junction, grounded or ungrounded, can be located at the end disc, center or lead end. Other thermocouple types are available.
    • Cartridge Heaters, Right Angle Copper Elbow
      Cartridge Heaters, Right Angle Copper Elbow
      Armor cable leads extend at right angle from 
heater with right angle copper elbow. 
3” lead beyond armor is standard. 
Specify longer lead if required. Specify: galvanized 
or stainless steel armor; length of heater sheath. 
Note: For Galvanized armor add “G” as suffix to termination number.
    • Cartridge Heaters, Immersion Pipe Fitting
      Cartridge Heaters, Immersion Pipe Fitting
      Threaded NPT pipe fitting is silver soldered or welded directly to heater sheath for immersion applications. Fiberglass insulated leadwires exit high temperature cement potting. 
3/4” cold required before fitting.
    • Cartridge Heaters, Post Terminals
      Cartridge Heaters, Post Terminals
      Threaded stainless steel terminals are welded 
directly to nickel pin for rigid mount applications. 
Includes two (2) nuts and washers for each terminal.
    • Cartridge Heaters, Mounting Flange
      Cartridge Heaters, Mounting Flange
      Stainless steel flange welded directly to heater sheath. Fiberglass insulated leadwires are standard. 
Other flange sizes and hole patterns are available upon request.
    • Cartridge Heaters with Integrated RTD
      Cartridge Heaters with Integrated RTD
      Cartridge Heaters with integrated RTD or thermocouple sensors are used in applications requiring high temperature and watt density heaters. When integrated into a thermal assembly, cartridge heaters are an excellent solution for rapidly heating GC detectors, and MS ion sources and nebulizers. 870°C (1,958°F) on Inconel® sheath Watt density to 400 W/in2…
    • Cartridge Heaters, Bolt Heaters
      Cartridge Heaters, Bolt Heaters
      Bolt heaters are used to tighten large bolts that secure heavy machinery and equipment. The shaft of the heater is inserted into the hollow bolt and energized to expand it, which allows further tightening of the nut. This heater design is manufactured with specific diameter sheaths to fit industry standard…
    • Cartridge Heaters, Duraslik Non-Stick
      Cartridge Heaters, Duraslik Non-Stick
      The Duraslik non-stick coating eliminates the need for additional release agents to be applied to the heater prior to the insertion. The non-stick coating acts as a corrosion inhibitor and a solid lubricant on the inner diameter of the drilled hole when the heater is energized, allowing for reduced downtime…

    Engineering Data

    Factors for Longer Heater Life:

    • Do not exceed recommended maximum watt density specified for the heater size.
    • The cartridge heater sheath must fit properly into the machined hole, a tight fit is crucial.
    • Protect the heater from contaminates such as oil, grease, and vapors.
    • Install adequate KW to accomplish work load and make up for heat losses.

     

    Special Modifications:

    In addition to the standard designs, Durex offers a variety of special modifications which are available to customize the heater for your application.

    Distributed Wattage - Resistance  windings can be concentrated in specific areas of the heater for localized heat distribution.

    Centerless Grinding - Precision grinding of the cartridge heater sheath provides tighter diameter tolerances when required.

    Teflon Coating - Teflon coating can be provided on heater sheath for applications requiring chemical resistance.

    Ground Leadwire -Separate color coded groundwire can be provided when required.

    Special Connectors - Various connectors for power leads can be provided upon request.

     

    Ordering Information - When ordering Cartridge Heaters, specify the following:

    • Nominal Diameter
    • Overall Sheath Length
    • Lead Length
    • Termination Type
    • Voltage
    • Wattage
    • Special Modifications

     

    Cartridge Heater Care and Maintenance:

    • Store heaters in a dry area, especially during periods of high humidity.
    • Protect leads from abuse and abrasion.
    • Maintain temperature control and keep accessories in good working condition to obtain correct operating conditions.
    • All cartridge heaters have hygroscopic tendencies and can accumulate moisture is shipping and storage.  Low heater insulation (less then 1 meg ohm) can be baked in an oven for several hours or started at low voltage to elimate moisture.

    Product Applications

    Typical Applications:

    • Liquid Immersion
    • Plastic Molds
    • Dies
    • Labeling
    • Medical Equipment
    • Platens
    • Packaging Equipment
    • Hot Stamping
    • Sealing
    • Injection Molding

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