Optic wire (CuNiZn)

Optical wires from bedra make an impression by a flawless surface finish which is required by all renowned optical manufacturers.

Range of application

Optic wire (CuNiZn)

Recommended for:

rim, temple, bridge, hinge, closing block & pad arm

Standardization and composition

Standard designationCuNi18Zn20
DIN17663
Material no.2.0740
DIN EN 12166CW409J
ASTM UNSC75900
Cu62
Znbalance
Ni18
Al0,3
Othersmax. 0,5

Physical properties

Density kg/dm³8,7
Melting range °C1060-1110
E-Modulus kN/mm²135
Thermal conductivity W/m*K33
Coefficient of thermal expansion 10-6/K17,7
Electrical conductivity MS/m3,3

Other technical values

Annealing temp. °C600-650
Hardness annealed HV95
Hardness 80% reduced HV250

Delivery programme

Profilesround wires / square profiles / flat wires / special profiles
Surface coatingsseveral electroplated coatings, upon request
Make-upsspools / coils / rods / drums

Further product information