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Wironit® extrahart

The ideal partial denture alloy for combination work

  • Due to its high proof strength and ultimate strength, this alloy is ideally suited for combination work
  • Outstanding casting properties thanks to the special composition with silicon and carbon
  • Very low thermal conductivity of the alloy emphasises the wearing comfort of the prosthesis
  • Biocompatible and corrosion-resistant
Composition in % by mass
Co 63.0 · Cr 30.0 · Mo 5.0 · Si 1.0 · Mn 1.0 · C
Alloy characteristics Standard values
Type (ISO 22674) 5
Density 8.2 g/cm3
Preheating temperature 950–1050 °C
Solidus, liquidus temperature 1260, 1390 °C
Casting temperature approx. 1420 °C
Young’s modulus 185 GPa
Proof strength (Rp0.2) 635 MPa
Elongation after fracture (A5) 8%
Vickers hardness 385 HV10

ISO 22674

Availability Contents REF
Wironit® extrahart 1000 g 50060
Wironit® extrahart 250 g 50050

ISO 22674

Accessories Contents REF
Wiroweld CoCr laser wire, carbon-free, Ø 0.35 mm 2 m – 1,5 g 50003
Wiroweld CoCr laser wire, carbon-free, Ø 0.5 mm 1.5 m – 2 g 50005
Cobalt-chrome solder 4g 52520

ISO 22674

Contact / Service

BEGO USA Inc.
24 Albion Road
Suite 103
Lincoln, RI 02865


BEGO Order:
Phone: 401-334-9261
Email: begoorders@begousa.com


BEGO Product Info:
Phone: 401-334-9261
Email: begoinfo@begousa.com


BEGO Service:
Phone: 401-475-3196
Email: begoservice@begousa.com

Pictures and illustrations are exemplary. Colors, symbols, design, and information on the labels and/or packaging shown may differ from reality.