Served Litz Wire

General

High frequency litz wire served with natural silk, polyester, or nylon is characterized by increased dimensional stability and mechanical protection. The optimized serving tension ensures high flexibility and splicing- or spring up prevention during the process of cutting the litz wire. This splicing effect can cause handing and contacting of the wire ends more difficult in post processing.

Features and benefits of served litz wires

  • Additional protection against mechanical stress
  • Excellent dimensional and physical stability
  • High flexibility
  • Splicing prevention
  • Good solderability above temperatures of 410 °C
  • Improved impregnation
  • Optimization of winding capacity
  • Serving material allows optimization of insulation distances

Technical properties of served litz wires

Technical values of serving material

Serving materials1) Silk Nylon Polyester*
Thermal properties
Recommended permanent use temperature 110 120 120 °C
Melting temperature - 250 - 260 250 - 260 °C
Elektrical properties
Dielektric constant ℇr 1.4 3.4 3.2
Mechanical properties
Elongation at break (dry) 13 - 25 25 - 46 20 %
Moisture absorption (65% rel. humidity, 21°C) 9 2.5 - 4 0.2 - 0.5 %
Other
Color white, green white white

Dimensions

Serving materials1) Silk Nylon Polyester*
Diameter of single wires2) 0.020 - 0.300 0.020 - 0.300 0.020 - 0.300 mm
Number of single wires3) 2 - 25,000 2 - 25,000 2 - 25,000 pcs
outer diameter of litz wires 0.071 - 4.0 0.071 - 10.0 0.071 - 4.0 mm
Number of layers (typ.) 1 - 2 1 - 2 1 - 2

* Available in Asia only
1) customized solution on demand (thermo adhesive yarns)
2) other diameters on demand
3) depending on number of single wires

Applications

  • HF transformers
  • HF in-/converters
  • HF transceivers
  • HF chokes
  • Inductive charger