RESISTANCE WIRE

Resistance wires are manufactured in our full range of materials with nickel alloys (or alternatives) available upon request.  Wire can be supplied to meet both the resistance and mechanical properties required by customer specifications.

Typical applications for resistance wires produced are

 

  • Electrofusion fittings
  • Under-floor heating cables
  • Under-ground heating
 
  • Electrical blankets
  • Industrial heating systems

 

Resistance Wire Product Range

 

Phosphor Bronze wires

 

Composition CuSn5 CuSn6 CuSn1
Copper Balance Balance Balance
Tin 4.5 – 5.5% 5.5 – 6.5% 0.5 – 1.0%
Phosphorus 0.01 – 0.4% 0.01 – 0.4% 0.01 – 0.4%
       
Properties CuSn5 CuSn6 CuSn1
Resistivity at 20oC 0.0315 Ω x mm2 /m 0.1408 Ω x mm2 /m 0.030 Ω x mm2 /m
Temperature coeff. of resistance 0.0035 / 1oC > 20oC 0.0065 / 1oC > 20oC 0.0022 / 1oC > 20oC
Density 8.9 kg/m3 8.80 kg/m3 8.90 kg/m3
Tensile Strength 300 – 550 N/mm2 450 – 1100 N/mm2 350 – 700 N/mm2
Elongation at soft temper >25% 30% 30%

 

Brass wires

Properties CuZn5 CuZn10 CuZn15 CuZn20 CuZn30 CuZn37
Copper 95% 89.0-91.0% 84.0-86.0% 79.0-81.0% 69.0-71.0% 62.0-64.0%
Zinc 5% Balance Balance Balance Balance Balance
 
Properties CuZn5 CuZn10 CuZn15 CuZn20 CuZn30 CuZn37
Resistivity
at 20oC
0.04 Ω x mm2 /m 0.04 Ω x mm2 /m 0.048 Ω x mm2 /m 0.053 Ω x mm2 /m 0.0625 Ω x mm2 /m 0.067 Ω x mm2 /m
Temperature
coeff. of resistance
0.003 / 1oC > 20oC 0.003 / 1oC > 20oC 0.0028 / 1oC > 20oC 0.0025 / 1oC > 20oC 0.002 / 1oC > 20oC 0.0015 / 1oC > 20oC
Density 8.80 kg/m3 8.80 kg/m3 8.80 kg/m3 8.70 kg/m3 8.50 kg/m3 8.40 kg/m3
Tensile
Strength
350 - 600 N/mm2 350 - 600 N/mm2 350 - 700  N/mm2 350 - 700  N/mm2 400 - 850  N/mm2 350 - 600  N/mm2
Elongation at
soft temper
30% 30% 35% 35% 35% 35%

 

Nickel Silver wires

Composition CuNi12Zn24 CuNi18Zn20
Copper 63-66% 60-63%
Nickel 11 – 13% 17 – 19%
Zinc Balance Balance

 

Composition CuNi12Zn24 CuNi18Zn20
Resistivity at 20o C 0.23 Ω x mm2 /m 0.32 Ω x mm2 /m
Density 8.70 kg/m3 8.70 kg/m3
Tensile Strength 500 - 850 N/mm2 500 - 880 N/mm2
Elongation at soft temper 30% 30%

 

Copper wires

Composition OFCU
Copper >99.99%

 

Properties OFCU
Resistivity at 20oC 0.0172 Ω x mm2 /m
Temperature coeff. of resistance 0.00393 / 1oC > 20oC
Density 8.90 kg/m3
Tensile Strength 250 - 450 N/mm2
Elongation at soft temper 35%

 

Aluminium wires

Other aluminium alloys are available upon request

 

Composition AlMg5
Aluminium Balance
Magnesium 4.8-6.5%

 

Properties AlMg5
Resistivity at 20oC 0.0615 Ω x mm2 /m
Density 2.64 kg/m3
Tensile Strength 250 - 450 N/mm2
Elongation at soft temper 17%

 

Copper Nickel Alloys

Composition CuNi1 CuNi2 CuNi6 CuNi10 CuNi15 CuNi25 CuNi44
(Constantan)
Copper 99% 98% 94% 90% 85% 75% 66%
Nickel 1% 2% 6% 10% 15% 25% 44%

 

Properties CuNi1 CuNi2 CuNi6 CuNi10 CuNi15 CuNi25 CuNi44
(Constantan)
Resistivity
at 20oC
0.0256 Ω x mm2 /m 0.0435 Ω x mm2 /m 0.0926 Ω x mm2 /m 0.1429 Ω x mm2 /m 0.21 Ω x mm2 /m 0.34 Ω x mm2 /m 0.49 Ω x mm2 /m
Temperature
coeff. of
resistance
0.003 /
1oC > 20oC
0.0013 /
1oC > 20oC
0.0007 /
1oC > 20oC
0.00063 /
1oC > 20oC
0.00035 /
1oC > 20oC
0.0002 /
1oC > 20oC
0.00004 /
1oC > 20oC
Density 8.9 kg/m3 8.9 kg/m3 8.9 kg/m3 8.9 kg/m3 8.9 kg/m3 8.9 kg/m3 8.9 kg/m3
Tensile
Strength
230 – 330 N/mm2 240 – 340 N/mm2 250 – 350 N/mm2 300 – 400 N/mm2 320 – 420 N/mm2 350 – 450 N/mm2 350 – 450 N/mm2
Elongation at
soft temper
>25% >25% >25% >25% >25% >25% >25%

 

Pure Nickel and other Nickel Alloys

Composition Nickel 201 NiMn2 80/20 NiCr
Nickel 98% 98% 80%
Iron (Fe) 0.40% 0.06%  
Copper 0.25%    
Manganese (Mn)   1.8%  
Chrome (Cr)     20%
Others Total <0.02% Balance  

 

Properties Nickel 201 NiMn2 80/20 NiCr
Resistivity at 20oC 0.085 Ω x mm2 /m 0.109 Ω x mm2 /m 1.09 Ω x mm2 /m
Temperature coeff. of resistance 0.0050 / 1oC > 20oC 0.0041 / 1oC > 20oC 0.0001 / 1oC > 20oC
Density 8.9 kg/m3 8.81 kg/m3 8.4 kg/m3
Tensile Strength 450 – 550 N/mm2 450 – 550 N/mm2 600 – 700 N/mm2
Elongation at soft temper >25% >25% >25%

 

Bercotherm Resistance Wire Range

Within the UK Chaplin Bros can offer Bedra’s Becotherm range of resistance wire which are often a cheaper alternative to nickel alloy wires.

 

Please contact us for more details.

 

Properties Bercotherm A4 Bercotherm SO,4 Bercotherm S2 Bercotherm S3 Bercotherm S4 Bercotherm S7
Density 8,3 kg/dm3 8,9 kg/dm3 8,7 kg/dm3 8,5 kg/dm3 8,9 kg/dm3 8,4 kg/dm3
Conductivity hard 9,1 MS / m 39 MS / m 4,9 MS / m 3,9 MS / m 18,5 MS / m 2,2 MS / m
Conductivity soft 10,6 MS / m 41 MS / m 5,1 MS / m 4 MS / m 18,7 MS / m 2,3 MS / m
Temp.coeff. of resistance 0,06 % / K 0,26 % / K 0,0357 % / K 0,0303 % / K 0,128 % / K 0,0025 % / K
Resistivity hard 0,1099 Ω x mm2 /m 0,0256 Ω x mm2 /m 0,2041 Ω x mm2 /m 0,2564 Ω x mm2 /m 0,0541 Ω x mm2 /m 0,4545 Ω x mm2 /m
Resistivity soft 0,0943 Ω x mm2 /m 0,0244 Ω x mm2 /m 0,1961 Ω x mm2 /m 0,2500 Ω x mm2 /m 0,0535 Ω x mm2 /m 0,4348 Ω x mm2 /m
Tensile strength hard 950 N / mm˛ 800 N / mm˛ 1000 N / mm˛ 1000 N / mm˛ 730 N / mm˛ 1100 N / mm˛
Tensile strength soft 500 N / mm˛ 450 N / mm˛ 420 N / mm˛ 520 N / mm˛ 340 N / mm˛ 520 N / mm˛

 

Properties Bercotherm S10 Bercotherm 12 Bercotherm 18
Density 8,5 kg/dm3 8,65 kg/dm3 8,75 kg/dm3
Conductivity hard 4,9 MS / m 4,6 MS / m 3,6 MS / m
Conductivity soft 5,2 MS / m 4,8 MS / m 3,55 MS / m
Temp.coeff. of resistance 0,045 % / K 0,0416 % / K 0,031 % / K
Resistivity hard 0,2041 Ω x mm2 /m 0,2174 Ω x mm2 /m 0,2778 Ω x mm2 /m
Resistivity soft 0,1923 Ω x mm2 /m 0,2083 Ω x mm2 /m 0,2817 Ω x mm2 /m
Tensile strength hard 1000 N / mm˛ 1100 N / mm˛ 1100 N / mm˛
Tensile strength soft 530 N / mm˛ 520 N / mm˛ 500 N / mm˛

 

Read about Packaging Options for our Wire