For more than one hundred years, we've been working with precious metals and alloys to produce products with general and specific applications for a wide range of industries.
Pure Platinum is supplied by Sigmund Cohn Corp. in two grades: Reference Grade, which is 99.99% pure, and Commercial Grade, which is 99.95% pure.
Sigmund Cohn Corp. offers several Platinum Group families.
Metals and Alloys:

Palladium (99.95%)
Platinum/Palladium
Platinum/Gold/Iridium
Platinum/Iridium
Platinum/Rhodium
Platinum/Ruthenium
Platinum #851®: Platinum/Rhodium/Ruthenium
Platinum/Molybdenum
Platinum/Nickel
Platinum #479®: Platinum/Tungsten 		Many distinctive alloys are designed to provide specific resistivities, tensile strengths or degrees of nobility

Other Platinum alloys are also available on request

Sigmund Cohn Corp. produces Gold of two basic purities 99.99%, High Purity Gold, and 99.98%, Commercial Gold.

Metals and Alloys:

Low resistance alloys: LR 80®

 Other alloys include

Gold/Gallium
14 and 18 Kt Gold
Gold/Antimony
Gold/Platinum
Gold/Iron

Pure Silver in wire and ribbon form
Alloys of Silver and Copper in several low resistances

Sigmund Cohn Corp. produces unique products by combining base metals to achieve targeted results for unique applications.
Copper (99.98%)
Iron (99.9+ %)
Aluminum (High Purity, 99.999% and Aluminum #1100, 99%)
Tungsten (99.98%)
  • Gold or Platinum plated
  • Electropolished to a minimum of .00010"
  • Offered to specified resistances
Nickel
  • Available in 3 grades
  • RT quality to very high and uniform TCR specifications
  • DIN 43760
  • Commercially pure type 205
Constantan® (Cu-55%, Ni-45%)
Nickel/Chromium (Ni-80%/Cr-20%)
Nichrome 80*/Tophet*(Ni-61%/Cr-15%/balance-Fe)
Nichrome 60*
Aluminum/Silicon (Al-99%/Si-1%)
Aluminum/Magnesium (Al-99%/Mg-1%)
Nickel/Cobalt/Iron (Ni-29%/Co-17%/balance-Fe)
Kovar**
Stainless Steel #302 (Cr-18%/Fe-70%/Ni-10%/plus Mn, C, Si)
Copper/Silver (Cu-85%/Ag-15%)
Phosphor Bronze Grade A (Cu-95%/Sn-5%)
Phosphor Bronze Grade C (Cu-92%/Sn-8%)
Beryllium Copper #10 (Cu-96.9%/Be-0.6%/Co-02.5%)
Beryllium Copper #25 ( Cu-97.75%/Be-2%/Co-0.25%)


* Nichrome 60 and Nichrome 80 are registered trademarks of D. H. Alloys, Inc.
** Kovar and Tophet A are registered trademarks of CRS Holdings, Inc., a subsidiary of Carpenter Technology Corporation.