SynWire – Winding Wires SynWire type 155, Copper Wire, round, enamelled, self bonding

  • enamelled round copper wire, self-bonding
  • insulated with solderable polyurethane
  • aliphatic polyamide
  • class 155

The SynWire type 155 is a thermal class F enamelled copper wire which can be directly soldered and self bonded under heat. With a solder bath temperature from  390 °C the wire is solderable without prior removal of the insulation film.

The SynWire type 155 is a 2-ply self bonding wire with a high resoftening temperature which is used to produce thermally stimulated windings in an integral and thus space saving, machine suitable, efficient and cost-effective manner. In contrast to impregnants, these windings can be bonded quickly and environmentally friendly. The self bonding windings are characterised by their thermal and mechanical stability. State-of-the-art processing techniques, process controls and checks ensure the constant high quality of these wires.

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Electric motors, induction coils, stator windings, air coils


IEC / DIN EN 60317-35
IEC / DIN EN 60317-0-1
Partly UL approved

Delivery forms

Grade 1B + 2B: 0.036 – 1.25 mm

Technical data

Typical properties of enamelled round self-bonding copper wire, 0.500 mm, with insulation film grade 1B

Property Unit of measure Set value  Actual value (typ.) 
Outer diameter with varnish  mm  min. 0.541 - max. 0.568 as set value
Bare wire diameter  mm  0.495-0.505 as set value
Adhesion and elongation    1 x d, no cracks 1 x d / 10 % pre-elongation
Elongation at break  ≥ 28 ≥28
Adhesiveness at r.t.  1.1 >1.1
Property Unit of measure Set value  Actual value (typ.) 
Temperature index TI  °C  min. 155 >155
Re-softening temperature  °C  160 ≥ 160
Heat shock at 175 °C    ≥175 ≥ 175
Solderability at 390 °C  ≤ 6 ≤ 4
Bonding temperature  °C  200 ± 2 180-200
Cut through temperature (pre-heated block)  °C  min. 200 ≥ 2 Min. at 200
Property Unit of measure Set value  Actual value (typ.) 
Dielectric strength RT  kV  ≥ 2.4 (twist) ≥ 2.4 (twist)
Electric conductivity  m/Ωmm²  58-59 58.5