The finest of the earth’s elements
Precious metals & alloys
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 in two grades: Reference Grade, which is 99.99% pure, and Commercial Grade, which is 99.95% pure.
Metals and Alloys:
Platinum #851®: Platinum/Rhodium/Ruthenium
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.
Gold is supplied in two basic purities 99.99%, High Purity Gold, and 99.98%, Commercial Gold.
Low resistance alloys: LR 80®
14 and 18 Kt Gold
Silver & Silver Alloys
Pure Silver in wire and ribbon form
Alloys of Silver and Copper in several low resistances
Base Metals & Alloys
Sigmund Cohn Corp. produces unique products by combining base metals to achieve targeted results for unique applications.
Iron (99.9+ %)
Aluminum (High Purity, 99.999% and Aluminum #1100, 99%)
Gold or Platinum plated
Electropolished to a minimum of .00010"
Offered in specified resistances
Available in 3 grades
RT quality to very high and uniform TCR specifications
Commercially pure type 205
Constantan$reg; (Cu-55%, Ni-45%)
Stainless Steel #302 (Cr-18%/Fe-70%/Ni-10%/plus Mn, C, Si)
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.