Special materials
CLASSICAL   COPPER     ( 99.5-99.99% )

High-pure oxygen-free copper of standard marks has the highest characteristics among classical marks of copper (99.0-99.99% according to GOST 859-2001, ASTM B170). Simple explanation is higher requests to copper in a number of use areas and accordingly to structure of impurity. The basic marks and characteristics of High-pure oxygen-free copper:
  • M00б, С10100, Cu-OFE  and others
  • Chemical purity  99,99%
  • Electrical conductivity 101-102% IACS
  • RRR* ~ 200-250
* RRR - relative residual resistance, the attitude of resistance at 293К and 4.2К
( R293K/R4.2K )
Standards  of GOST 859-2001 (Russia)  and ASTM B170 (USA) are well-known standards and describe the list of controlled impurities, their maximal content and the maximal content of each of them. Controlled impurities of these standards are the most difficult to remove and influencing the characteristics of copper used in critical and special areas. By classical manufacture separate results can be sometimes above 99,99 %, but are guaranteed "not less than 99.99 %": to fulfill 99.99% according to these standards is not so simply.
CU 4N5 - 9N

According to the standards of GOST 859-2001 (Russia) and ASTM B170 (USA), it is extremely difficult to achieve a result above 99.997-8%, at least guaranteed. Therefore, often the manufacturer for copper 5N and above sets its own specifications describing its / other / abridged list of elements for determining purity, and sometimes the "rules" for calculating purity. Such 5N-9N copper is typically / often not even 4N according to ASTM B170 and may have characteristics even worse than 3N according to these standards. For example, some catalogs present copper "Cu 99.9999% trace metals basis". The resistivity of this "Cu 99.9999%" is indicated by 1.673 μΩ * cm, 20 C. In this case, the conductivity is ~ 103.06% IACS. Copper about 99.995-8% according to GOST 859-2001 and ASTM B170 can have such electrical conductivity. Comments on Cu 5-9N in the "Documents" section.
In some problems it is permissible not to take into account some impurities, but these points must be distinguished. For example, in cryogenic, any impurity has an effect, to a greater or lesser extent.

Some various sources claim that for a very pure "correct copper 99.999%":

  • Electrical conductivity  ~103,4-6% IACS
  • RRR >1000.

We have conducted preliminary research and experimental work. We have developed our own technology allowing us to predict, produce and supervise a chemical compound of purity 5N+ and above. The basic necessary equipment for our technology was designed and made by ourselves or according to our specifications and drafts.  We have received steady guaranteed results and have produced experimental product of the highest quality
Super Pure Oxygen-Free Copper in ingots.

Сharacteristics :

  • Chemical purity   99,9995 – 99,99999+ % ( based on elements from ГОСТ 859-2001, ASTM B170 ! )
  • Electrical conductivity   104 – 105 % IACS
  • RRR   1500 – 3000
  • Similar to monocrystal
Shape, Size and Weight of ingots :
  • Ingots are close to cylinder
  • Diameter of   85 – 95 mm
  • Height/length of   100 – 150 mm ( typical 120 – 130 mm )
  • Weight   ~6000 – 8000 gram  ( typical ~6500 – 7000 gram )
Our products are not laboratory samples and we can offer not great lot  at a time and then discuss future deliveries.The product is unique in its characteristics and is probably the best or one of the best in the world in terms of its chemical purity and physical characteristics (Electrical and Thermal conductivity etc. ). More detailed information concerning our product you can see in other sections.
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