Flex Heater Elements

Foil element choice will be determined by your heater profile. A heater profile can be determined through experimentation with standard heaters and your desired thermal needs. The heaters should be arranged at varying power levels to determine optimum temperature gradient across the entire surface. By profiling and determining where heating losses need to be compensated, we can match the most efficient profile with a single element.

There are two common types of flexible heaters: the older wound-wire devices and foil-based devices. Both use metals with different resistivity and heating characteristics.

Wire heaters use a single or several strands of wire to transfer heat to a tangent point or arc area of its circular heating element. In contrast, the flat surface of foil heaters provides more uniform heating thanks to significantly more surface area devoted to heat transfer.


Stainless Steel 304

With etched foils, Stainless Steel 304 is standard. It has a minimum of 18% chromium and 8% nickel, combined with a maximum of 0.08% carbon. Along with excellent forming properties, stainless steel 304 is corrosion/oxidation resistant thanks to its chromium content. Stainless steel 304 is an excellent heat exchanger with elevated temperatures due to its higher carbon content.


Typical Physical Properties
Density (g/cm3) 8.0
Electrical resistivity at 20°C (Ωmm2/m) 0.68
Temperature factor of resistivity (20°C~600°C) x 10-5/°C -6
Conductivity coefficient at 20°C (WmK) 17
Maximum Temperature: Mechanical 420°C
Coefficient of Thermal Expansion
Temperature Thermal Expansion x 10-6/K
20°C - 400°C 16
Specific Heat Capacity
Temperature 20°C
J/gK 0.48

CuNi44

The copper-nickel alloy CuNi44 is also offered. CuNi44 is characterized by high electrical resistance, high ductility, and good corrosion resistance. It is suitable for use at temperatures up to 400°C.


Typical Physical Properties
Density (g/cm3) 8.9
Electrical resistivity at 20°C (Ωmm2/m) 0.49
Temperature factor of resistivity (20°C~600°C) x 10-5/°C -6
Conductivity coefficient at 20°C (WmK) 23
Maximum Temperature: Mechanical 600°C
Coefficient of Thermal Expansion
Temperature Thermal Expansion x10-6/K
20°C - 400°C 15
Specific Heat Capacity
Temperature 20°C
J/gK 0.41

Inconel600

We also offer Inconel600 as a heating element which offers the highest resistance with no magnetic properties. It is an austenitic alloy with a high nickel content. The high nickel content of the alloy provides good resistance to reducing environments while the chromium content provides resistance to weaker oxidizing conditions.


Typical Physical Properties
Density (g/cm3) 8.5
Electrical resistivity at 20°C (Ωmm2/m) 1.03
Temperature factor of resistivity (20°C~600°C) x 10-5/°C -6
Conductivity coefficient at 20°C (WmK) 15
Maximum Temperature: Mechanical 1100°C
Coefficient of Thermal Expansion
Temperature Thermal Expansion x10-6/K
20°C - 400°C 13
Specific Heat Capacity
Temperature 20°C
J/gK 0.46
Celebrating 65 Years of Manufacturing Excellence  Learn More →
America's Oldest. A History of Innovation.

Today at Epec, the customer comes first, and everything we do must be put through that filter. Whether it is developing e-commerce platforms to make it easier to work with us, or creating a NPI (new product introduction) process that helps our customers get to market faster, or the other 10 new projects we have in process, we must focus on building the new. By doing that every day, and by always making the customer our top priority, we plan on being here for another 65 years and then some.

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Celebrating 65 Years - Epec Engineered Technologies