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
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. N 1.1 > 1.1
Property Unit of measure Set value Actual value
Temperature index TI °C min. 155 > 155
Re-softening temperature °C 160 ≥ 160
Heat shock at 175 °C ≥175 ≥ 175
Solderability at 390 °C s ≤ 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
Dielectric strength RT kV ≥ 2.4 (Twist) ≥ 2.4 (Twist)
Electric conductivity m/Ωmm² 58 - 59 58.5