bedra electronic wire Bl4 out of a tin-bronze alloy for various applications (ribbon, heating conductors / resistance wire, special cables, bobbins, connectors, etc.).

Standardization and composition

Norm CuSn 4
DIN 17662
EN DIN 12166 CW 450 K
CDA UNS not standardized
Alloy composition Average values according to standard (%)
Cu balance
Sn 4.0
P 0.10
Others max. 0.5

Physical properties

Density (kg/dm³) 8.9
Melting range (°C) 960 - 1060
E-Modulus (kN/mm²) 125
Thermal conductivity (W / m x K) 90
Coefficient of linear mean expansion (10-6/K) 18.2
Electric conductivity (m / Ω x mm²) 12
Electric conductivity (IACS %) ~ 20
Resistiviy (Ω x mm² /m) 0.0833

Further product information

Please contact me and my team

Ute Schmidt

Ute Schmidt

Electronic Wires Sales for Europe
bedra Germany

Rodney Williams

Rodney Williams

Vice President bedra, Inc.
bedra USA

Shawn Lv

Shawn Lv

Sales Manager ELAS Asia (without China)
bedra Hong Kong

Berkenhoff GmbH (headquarters)

  • Kinzenbach plant
  • Berkenhoffstrasse 14
  • 35452 Heuchelheim
  • Germany

Berkenhoff GmbH

  • Merkenbach plant
  • Rehmühle 1
  • 35745 Herborn
  • Germany

Follow us



Metal price

To overview