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1/8th Inch Cartridge Heaters

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The 1/8th Inch (3.175 mm) cartridge heater was developed for Original Equipment Manufacturers (OEMs) that required a small but high power thermal solution.

This miniature cartridge heater is designed with a thin 304 stainless steel wall for fast temperature response and is swaged for low internal temperatures and longer life. Additionally, Durex' proprietary magnesium oxide (MgO) compaction process assures the highest possible dielectric strength. 1/8th Inch cartridge heaters can be used in applications up to 1000°F (538°C). Custom heaters can be designed in lengths up to 12 inches (305 mm), and 750 watts.

Miniature Cartridge Heater Advantages:

Proprietary Swaging Process - Higher operating temperature • Higher heat transfer • Robust heater design • Longer heater life

Proprietary MgO Compaction - Higher dielectric strength • Faster thermal response

Miniature Size/Low Mass - Better heat transfer • Quicker response time • Longer life due to lower internal temperature

1/8th Inch Cartridge Heaters Specs & Options

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Heater Construction

  • Heater Sheath Material: Standard 304 stainless steel, optional Inconel®
  • Heater Sheath Temperature: 1400°F (760°C)
  • Heater Sheath: Swaged
  • Leadwires: Standard solid lead wires, optional stranded lead wires
  • Wire Insulation: Fiberglass Rated 250ºC (482ºF), Teflon® Rated 200ºC (392ºF), Mica Glass Tape Rated 450ºC (842ºF)
  • Welded End Disc
  1. End disc TIG welded to prevent moisture absorption.
  2. 304 stainless steel for harsh environments. Also available in Inconel®.
  3. Magnesium oxide (MgO) insulation compacted for maximum dielectric strength and thermal conductivity.
  4. Nickel-chromium resistance wire evenly wound for uniform heat distribution to the sheath.
  5. Ceramic core is a robust base for the heater element.
  6. Ceramic cap reduces potential for contamination.
  7. Fiberglass or Teflon lead wires.

 

 

 

Electrical Specifications

  • Minimum Volts: 5V
  • Maximum Wattage @ 240V: 744W *Depends on wire watt density
  • Maximum Amperage @ 240V: 3.1A
  • Wattage Tolerance: +10%, –15%
  • Maximum Volts: 240V

Mechanical Dimensions

  • Diameter: 0.122 inch (3.10 mm) +/- 0.002 (0.05 mm)
  • Length Minimum: 0.75 inch (19.05 mm)
  • Length Maximum: 12 inch (304.8 mm)
  • Length Tolerance to 4.5 inch (114.3 mm): +/- 0.94 inch (2.4 mm)
  • Length Tolerance > 4.5 inch (114.3 mm): 3.0%

Guideline: Cartridge Heater Watt Density for Heating Metals W/in² (cm²)

Tight hole clearance is essential for maximizing the watt density and extending the life of a cartridge heater. Contact factory for applications beyond the Cartridge Heater Watt Density Guideline.

Hole Clearance 1000°F (538°C) 800°F (427°C) 600°F (316°C) 400°F (204°C) 200°F (93°C)
0.0025 in (0.630mm) 205 (31.77) 295 (45.72) 300 (46.5) 300 (46.5) 300 (46.5)
0.0005 in (0.127mm) 175 (42.62) 240 (37.20) 300 (46.5) 300 (46.5) 300 (46.5)
0.0075 in (0.190mm) 145 (22.47) 200 (31.00) 285 (44.17) 300 (46.5) 300 (46.5)
0.0100 in (0.254mm) 100 (15.50) 150 (23.25) 200 (31.00) 250 (38.75) 300 (46.5)

1/8th Inch Cartridge Heaters Applications

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Analytical Instrumentation

  • Gas Chromatograph
  • Mass Spectrometers

Medical Devices

  • Fluid Heating
  • Patient Comfort

Semiconductor Equipment

  • Die Bonding
  • Integrated Circuit Testing

Aerospace

  • Freeze Protection

1/8th Inch Cartridge Heaters Case Studies

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1/8" Cartridge Heaters For Analytical Instrumentation

1/8th Inch Cartridge Heaters Downloads

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1/8" Cartridge Heater Spec Sheet - 1/8-INCH-CART-0922– 572KB

Cartridge Heaters 6-22-23 – 2MB