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Mica Strip Heaters

Backer Marathon Strip Heaters are manufactured to your custom specifications. They feature a high temperature oxidation metal sheath and high grade mica insulation resistant to moisture and high temperatures. Nickel/Chromium resistance wire evenly would provides for uniform and reliable heat distribution. Backer Marathon Mica Strip Heaters are LLL recognized to standard UL499 and test to Canadian standard C222. File number 72-M1984

Standard Mica Strip Heater Specifications

Length  Minimum 2.5" - Maximum consult sales department
Width Minimum 3/4"
Thickness Standard .156"
Fold Over 1/4"
Maximum Sheath Temperature 900°F/482°C
Mounting Slot 9/32" x 3/8"
Terminals 10-32 x 5/8" Post terminals or 10" High temperature fiberglass leads
Wattage Recommended maximum wattage 40 watts/square inch
Voltage  480 VAC Maximum



Mica Strip Heater Butt Case

Butt Case

  • Butt case for applications where a strip heater will be placed in a mill slot between two steel plates.
Mica Strip Heater with Ceramic Terminal Covers

Ceramic Terminal Covers

  • Ceramic terminal covers 3/4" in height and 3/4" diameter.
Mica Strip Heater with Stainless Steel Sheath

Stainless Steel Sheath

Mica Strip Heater Terminal Box

Terminal Box

Mica Strip Heater Internal Thermocouple

Built-In Thermocouple

Mica Strip Heater with a Hole

Holes and Cutouts

  • Mounting holes may be located anywhere on the heater as long as there is a minimum of 1" between the edge of the hole and one side of the heater.
    • Please provide drawing for hole dimensions and locations.

Three Phase & Dual Voltage


  • A third terminal may be added for dual voltage, three phase operation or for easy grounding.

Mica Strip Heater Terminations

Fiberglass Leads

Mica Strip Heater SL1

Order Type SL1

  • Fiberglass Leads out same end center.
  • 10" leads standard.
  • Leads rated to 850°F
Mica Strip Heater SL4

Order Type SL4

  • Leads out at top of heater
  • Brass eyelet where leads exit sheath
  • 1/2” sleeving at exit

Stainless Steel Braid

Mica Strip Heater SB1

Order Type SB1

  • Stainless Steel Braid offers a combination of flexibility and abrasion protection
  • Leads out same end center
  • Specify Braid length
  • Leads are 2” longer than braid
Mica Strip Heater SB4

Order Type SB4

  • Leads out top of heater
  • Brass eyelet where leads exit the sheath

Post Terminals

Mica Strip Heater SN1

Order Type SN1

  • Post terminals vertical
  • Minimum width 1.5”
  • Marathon standard location
Mica Strip Heater SN2

Order Type SN2

  • Post terminals parallel
  • Minimum width 1.5"
Mica Strip Heater SN3

Order Type SN3

  • Post terminals opposite ends
  • Minimum width 
Mica Strip Heater SN4

Order Type SN4

  • Offset Terminals
  • Minimum width 1-1/2"


Stainless Steel Conduit

Mica Strip Heater SC4

Order Type SC4

  • Stainless Steel Conduit offers the outmost abrasion protection
  • Leads exciting out top side of sheath
  • Leads are 2” longer than conduit


Mica Strip Heater with Button Terminations

Button Terminals

  • Button terminals are ideal for low clearance applications
Mica Strip Heater with Euro Plug

Euro Plug


Mica Strip Heater Watt Density


Watt Density for Strip Heaters = Wattage / (Heater Length - Cold) x Width

Maximum Recommended Watt Density

Part Temp (°F) 200 300 400 500 600 700 800
Max Watt Density 47 46 45 42 38 33 25

Exceeding these recommendations will result in shorter heater life.

Stock Parts

Part No. Watts Volts Length Width Available Qty Price
DRAWING-ST 0 watts 0 volts 0.00 inches 0.000 inches 0 Sign In for Pricing