The resistivity and maximum operating temperature are the most important characteristics of a resistive wire. The higher the resistivity, the thicker the gauges with which a given resistance is obtained and therefore its useful life is longer. Likewise, the higher the maximum operating temperature, the higher the surface load (W/cm²) will be supported. Notwithstanding the temperature required in each particular application and the area available to accommodate the resistance will determine the wire to be used.
Swedish brand founded in 1931. Its founder invented resistive wires based on the FeCrAl alloy that is the basis of most resistive wires used today.
|Resistivity at 20°C [Ω mm²/m]||1.35|
|Melting Point [°C]||1500|
|Maximum Continuous Operating Temperature in air [°C]||1300|
|C (%) Max||0.08|
|Si (%) Max||0.7|
|Mn (%) Max||0.5|
|Cr (%) Min-Max||20.5-23.5|
|Al (%) Nominal||4.8|
Cross Section: Circular, 0.10mm to 5.00mm.
This supplier supplies us with resistive wires continuously since the beginning of the century.
References: OCr21Al4, OCr21Al6, OCr21Al7Mo2
|Resistivity at 20°C [Ω mm²/m]||1.23||1.42||1.53|
|Melting Point [°C]||1500||1500||1520|
|Maximum Continuous Operating Temperature in air [°C]||1100||1250||1400|
|Cr (%) Min-Max||18-21||19-22||21-23|
|Al (%) Min-Max||3-4.2||5-7||5-7|
OCr21Al4: Rectangular, 0.9X0.06mm a 7.0x0.20mm.
OCr21Al6 y OCr21Al7Mo2: Circular, 0.10mm a 5.00mm.