Silicone Rubber-Insulated Heating Wire
Industrial Heaters

Silicone Rubber-Insulated Heating Wire

Silicone rubber insulated electric heating wires use nickel-chromium or copper-nickel resistance wires as the heating element, wound on a fiberglass core and extruded with a single or double layer of silicone rubber insulation. The wire is flexible and can be arranged along refrigerator and freezer evaporators, door frames, drip trays, drain pipes, and surfaces of small equipment, for defrosting, anti-condensation, anti-freezing, and heat preservation; the heating length, cold end, resistance per meter, total power, and leads with terminals are matched according to the equipment voltage and installation dimensions.

Heating element
Nickel-chromium or copper-nickel resistance wire
Core wire
Glass fiber core wire
Insulation structure
Single-layer or double-layer silicone rubber insulation
Supply voltage
≤240 V AC
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Product highlights

  • Nickel-chromium or copper-nickel heating wire wound on a fiberglass core, combining flexibility and resistance stability
  • Single or double layer silicone rubber insulation adapts to low temperature, humid, and repeated hot and cold cycling environments
  • Maximum 40 W/m line power suitable for defrosting, anti-condensation, and drain frost protection in refrigeration equipment
  • The heating section and non-heating cold end can be matched to equipment dimensions, with optional metal braided mechanical protection
  • The wet area ends use silicone rubber molding or equivalent sealing, and are equipped with a thermostat or thermal protector

Technical specifications

Heating element
Nickel-chromium or copper-nickel resistance wire
Core wire
Glass fiber core wire
Insulation structure
Single-layer or double-layer silicone rubber insulation
Supply voltage
≤240 V AC
Maximum line power
40 W/m
Finished outer diameter range
2–10 mm (tolerance ±0.2 mm)
Common fine diameter specifications
Approximately 2.4 mm
Operating temperature range
-60–150°C
Resistance per meter
Maximum 8,000 Ω/m
Heating section and cold end
Length designed according to equipment size, supply voltage, and target total power
Optional mechanical protection
Metal braided layer
End treatment
Wet areas use silicone rubber molding or equivalent sealing; terminals and connectors are configured according to the device interface
Typical Applications
Defrosting of refrigerator and freezer evaporators, anti-condensation on door frames, freeze prevention for drip trays and drain pipes, heating of insulation equipment
Control and Protection
Equipped with thermostat, timed defrost controller, or thermal protector; must not be powered under conditions exceeding the heat dissipation design
Selection Parameters
Provide voltage, heating length, total power or resistance per meter, cold end length, wire diameter, terminals, and installation environment
Industrial Heaters

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PVC insulated electric heating wires are made by winding nichrome or copper-nickel resistance wire on a fiberglass core, then extruding it with heat-resistant PVC insulation. The wires are soft and easy to shape, suitable for defogging door frames, low-temperature compensation, and low-power defrosting in refrigerators, freezers, vending machines, and ice makers. They can also be made into aluminum foil laminated heating elements. The heating length, resistance per meter, cold ends, terminals, and total power are matched according to the equipment voltage and allowable surface temperature.

  • Nichrome or copper-nickel heating wire is wound on a fiberglass core; the wire is soft and easy to shape
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  • The standard low-load structure has a maximum of 8 W/m, and the 105°C grade structure has a maximum of 12 W/m
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Aluminum-Tube Defrost Heating Wire

The aluminum tube defrost heating wire places single-layer or double-layer silicone rubber insulated heating wire into a formable aluminum tube. The tube transfers heat to the evaporator, water pan, or drainage area, and is used for defrosting and anti-freezing in refrigerators, freezers, display cabinets, and commercial refrigeration equipment. The tube shape, heating section, cold end, lead, and terminal can be matched according to the equipment installation space, and the system should be controlled by a thermostat, defrost controller, or thermal protector.

  • Formable aluminum tube combines heat conduction, mechanical protection, and arrangement in limited space
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  • Maximum linear power for refrigeration equipment application is 35 W/m, facilitating the control of local heat load
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The U-shaped tubular heater for liquids encloses a nickel-chromium resistance heating wire centered within a metal tube, with insulation and thermal conductivity achieved by compacting high-purity magnesium oxide. After bending the tube into a U shape, it can be directly immersed in water, cleaning solutions, heat transfer oil, or fuel oil, with both terminals located outside the container. The surface load, sheath material, and total power must be designed according to the thermal conductivity, viscosity, corrosiveness, target temperature, and liquid flow conditions of the medium. During operation, the entire heating section must remain fully submerged and be equipped with a temperature controller, independent over-temperature protection, and low-liquid-level power-off interlock.

  • The U-shaped double-ended structure facilitates installation from the side wall or top of the tank or container, with external wiring completed outside.
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