23.12/2022
Merry Christmas and Happy New Year 2023!
27.06/2022
POLEMA’s QMS confirmed its compliance with ISO 9001:20015
POLEMA JSC confirmed the compliance of the current QMS with the requirements of ISO 9001:2015.
03.06/2011
Progressive materials for multi-functional vacuum coatings
Application fields of materials for multi-functional vacuum coatings, characteristics of sputtering targets and evaporable sources used for technologies of physical deposition of hardening, protective, decorative and light-reflecting coatings, resistive, switching and transparent electro conductive films.
24.05/2011
Molybdenum and tungsten products for production of leucosapphires
POLEMA JSC is the leading global manufacturer of chromium, molybdenum, tungsten products, metal powders and composite materials.
Powder and grit made of electrolytic chromium
JSC POLEMA produces powders and grit of electrolytic chromium with various chemical compositions and particle size.
Powders and grit are produced through mechanical grinding of refined electrolytic chromium material of the appropriate purity, with subsequent screening in order to achieve the needed particle size.
Powders made of refined electrolytic chromium are meant for use in manufacturing.
Grit made of refined electrolytic chromium is used as evaporable sources during vacuum application of chromium coatings.
Powder made of high-purity refined electrolytic chromium containing the base element 99.99 % Cr and 99.98 % Cr
| Grade |
Cr, % (mass)* |
Impurities, ppm, maximum | |||||
|
Total content of metallic impurities |
C | N | O | S | |||
|
for fraction 56-280 microns (-50 mesh) |
for fraction 56-160 microns (-100 mesh) |
||||||
| MP-ERCr 99.99 | 99.99 min | 100 | 50 | 40 | 120 | 130 | 20 |
| MP-ERCr 99.98 | 99.98 min | 200 | 70 | 50 | 140 | 150 | 20 |
| *Metallic purity. The mass percentage of Cr is determined as the difference between 100% and the total content of metallic impurities, determined using the ICP-MS method | |||||||
MP – Milled Powder
Particle size: 56-280 microns (-50 mesh), 56-160 microns (-100 mesh) with base fraction content of at least 93.5%. Other particle sizes are possible to be based on client request.
Powder of refined electrolytic chromium with a purity of 99.95 % Cr
| Grade, fraction | Cr, % (mass) * | Impurities, ppm, maximum | |||||||||
| Al | Fe | Cu | Ni | Si | C | N | O | S | Other | ||
|
MP-ERCr-1 |
99.95 min | 15 | 150 | 30 | 50 | 100 | 80 | 30 | 120 | 20 | - |
|
MP-ERCr-1 |
99.95 min | 15 | 200 | 30 | 50 | 100 | 80 | 30 | 200 | 20 | - |
| *Metallic purity | |||||||||||
MP – Milled Powder
Powder of low-purity refined electrolytic chromium containing the base element 99.9 % Cr and 99.6 % Cr
| Grade | Cr, % (mass.)* | Impurities, ppm, maximum** | |||||||||
| Al | Fe | Cu | Ni | Si | Total content of metallic impurities | C | N | O | S | ||
| MP-ERCr 99.9 | 99.9 min | 70 | 500 | 40 | 100 | 100 | 1000 | 200 | 100 | 350 | 30 |
| MP-ERCr 99.6 | 99.6 min | 70 | 1500 | 50 | 100 | 350 | 4000 | 200 | 100 | 1500 | 30 |
|
*Metallic purity **Impurities norms are shown for powders MP-ERCr 99.9 of the fraction 56-280 microns and MP-ERCr 99.6 of the fraction 0-63 microns (-250 mesh). For powders of other fractions, impurities norms are determined in the specifications |
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MP – Milled Powder
Particle size: 56-280 microns for the grade MP-ERCr 99.9 with base fraction particle content of at least 85 %; 0-63 microns (-250 mesh) for the grade MP-ERCr 99.6 with base fraction particle content of at least 95 %; other dimensions are possible on the client's request.
Grit from refined electrolytic chromium with a purity of 99.95% Cr and 99.9 % Cr for evaporable sources
| Grade | Cr, % (mass.)* | Impurities, ppm, maximum | |||||||||
| Al | Fe | Cu | Ni | Si |
Other impurities, total** |
C | N | O | S | ||
| ERCr 99.95-PM | 99.95 min | 30 | 250 | 30 | 40 | 50 | 100 | 100 | 50 | 200 | 20 |
| ERCr 99.9-PM | 99.9 min | 70 | 500 | 40 | 100 | 100 | 190 | 200 | 100 | 350 | 30 |
|
*Metallic purity **K+Li+Mg+Mn+Mo+Na+V+W |
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Grit particle size: from 2.5 to 5.0 mm, with base fraction content of at least 88 %, as well as other sizes based on the client's request.
