Ohm's Law – Single
Ohm's Law – Triple (Delta)
Ohm's Law – Triple (Wye)
Heat Energy Requirements
Wattage Requirements
  • Silicone Rubber Heaters

    Durex’s silicone rubber heaters take advantage of the unique properties of silicone rubber to provide heating elements of unparalleled performance. Silicone rubber is calendared onto fiberglass cloth in a variety of thicknesses and constructions which serves as the basis for Durex’s silicone heating elements. Generally two layers of material containing an etched foil element or a precision wire wound element are vulcanized together to form a basic silicone heating element. The three most common constructions include:

    • .030” nominal thickness suitable for etched foil elements and low cost construction
    • .043” nominal thickness suitable for wire would heating elements that are permanently attached
    • .056” nominal thickness suitable for heating elements that are removable

    Thickness will be greater over the power lead exit point and over any options such as thermostats or temperature sensors.


    • High di-electric strength and resistance to di-electric fatigue
    • Ozone, weather, and chemical resistant
    • Flame retardant and non-toxic
    • Low outgassing with no sulfur or nitrogen to create hazardous compounds that are prevalent in organic rubbers
    • Proven thermal stability

    You may also be interested in Kapton® (polyimide)Flexible Heaters.  

    Engineering assistance is available, contact us.

    More Products In This Section

    • Silicone Rubber Heater Attachment Methods
      Silicone Rubber Heater Attachment Methods
      Durex silicone rubber heaters can be attached to customer parts by a variety of methods. Many factors can influence the optimal choice including heater watt density, operation temperature, geometry of part, and part material. Contact Durex engineering to discuss the best method for a specific application.
    • Silicone Rubber Heater Temperature Controls
      Silicone Rubber Heater Temperature Controls
      Durex silicone rubber heaters can be designed and manufactured with a variety of temperature controls. Contact Durex engineering to discuss the best method for your specific application.
    • Etched Foil Elements
      Etched Foil Elements
      Beginning with a Durex engineered photo tool, Durex photo develops and then chemically etches a highly precision, resistive foil circuit, to be vulcanized internally into a silicone heating element. Durex’s silicone etched foil elements can have internal element coverage of greater than 50% of the entire heating element area. This coverage lowers the…
    • Wire Wound Elements
      Wire Wound Elements
      Beginning with a computer designed, dedicated, winding pattern and tool, Durex manufactures precision wire wound silicone rubber heaters. Durex engineers select various combinations of resistance wires to be combined or stranded together to produce the optimal result. In many cases the resistance wire is wound around a fiberglass core for added…
    • Silicone Rubber Formed Heating Elements
      Silicone Rubber Formed Heating Elements
      Although most silicone rubber heaters are manufactured in a flat flexible shape, Durex regularly manufactures silicone rubber heaters in a variety of formed shapes. Forming can provide superior heat transfer, and ease of installation by the customer. A typical design would be a cylindrical shaped element that “snaps” onto a pipe…
    • Silicone Rubber Lead Wire Options and Harnesses
      Silicone Rubber Lead Wire Options and Harnesses
      Durex silicone rubber heaters can be furnished with a variety of lead wire or hook up wire. Typical wire type is Teflon insulated, stranded, wire. Stranded silicone wire is also often used. Durex silicone heating elements can be supplied with HPN or SJO type cord as well as individual leads that…
    • Silicone Rubber Heater Thermal Insulation
      Silicone Rubber Heater Thermal Insulation
      Durex can provide its flexible silicone rubber heaters with a variety of thermal insulation in varying thickness and material types.  For silicone rubber heating elements, silicone sponge form ⅛” to ½” is commonly provided. Kapton® heating elements can be provided with silicone or engineered insulations depending on the requirements of the…

    Engineering Data


    • Sizes: up to 36" wide (consult factory)
    • Standard Thickness: 0.030", 0.043", 0.056"
    • Maximum Operating Temperature: 450°F (232°C) intermittent
    • Minimum Operating Temperature: -60°F (-50°C)
    • Maximum Watt Density: 60 watts/in²
    • Maximum Voltage: 600 volts
    • Wattage Tolerance: standard +5% -10%



    Durex can provide silicone rubber heaters with a variety of wattage and power options. Although uniform watt density (watts per square inch) is the most common configuration, Durex engineering can profile the power density to supply the heat where it is needed in the application. A common scenario is when heating a plate, the outer perimeter can be manufactured with a higher watt density to minimize edge loss and yield a more uniform temperature across the surface.

    Silicone rubber heaters can also be provided with independent circuits so that two different power densities can be utilized. For example, a higher powered circuit could be used to bring a part up to temperature, while an energy saving lower powered circuit maintains the part at a desired temperature. This design feature can be beneficial with applications that are battery powered to conserve battery life.

    Durex silicone rubber heaters can be powered with voltages up to 600 volts in both AC and DC applications. For high voltage applications, Durex engineering will select the appropriate materials and design the elements to account for the higher di-electric requirements. Dual voltage heating elements can also be provided by Durex. A common configuration would be a 120/240 volt heating element. This three wire lead arrangement allows the OEM customer to stock only one heating element that can be utilized in both their 120 volt and 240 volt machines. To accomplish this benefit, Durex engineering designs the heating element with two circuits that can be wired in either parallel or series to achieve the same wattage output for both voltages.

    Independent four power lead, dual voltage heaters are also possible under certain situations. For the aerospace and aviation industries, Durex provides 28/120 volt heating elements that contain separate independent circuits to deliver the same wattages for either situation. Consult Durex engineering for assistance with any of these options.

    Durex offers flexible heating element component recognition for both UL and Canada under UL file number E110394. Durex is continually increasing its product offerings and options under component recognition. Please call Durex for the latest inclusions. In addition, Durex product support can be a valuable resource in seeking approval for UL listing on OEM equipment as it relates to issues with heating elements as Durex has helped many OEMs with certification issues.

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