Alloy Is 87.5 CPM (CPM 875)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
СрМ 87,5 |
| Designation GOST Latin |
CpM 87,5 |
| Transliteration |
SrM 875 |
| The chemical elements |
AgCu 87,5 |
| Name |
The value |
| Designation GOST Cyrillic |
СрМ 875 |
| Designation GOST Latin |
CpM 875 |
| Transliteration |
SrM 875 |
| The chemical elements |
AgCu 875 |
Description
Alloy is 87.5 CPM applies: for production of sliding contacts, electrical conductors and other products for industrial purposes; items of tableware (spoons, forks, knives, coasters, dishes, blades, shovels, cups, glasses, sugar bowls, tea strainer); ritual and ceremonial items (wedding rings, crosses); jewellery for personal adornment (rings, rings, medallions, pendants, brooches, chains, bracelets, pins, cufflinks); cigarette cases and cigarette holders; commemorative medals and badges.
Note
Alloy silver-copper. With the increase of copper content in the alloy increases its hardness, but alloy becomes yellowish. The oxygen in the alloy increases the hardness and fragility.
Standards
| Name |
Code |
Standards |
| Non-ferrous metals, including rare metals, and their alloys |
В51 |
GOST 30649-99, GOST Р 51152-98, GOST 6836-2002 |
| Classification, nomenclature and general norms |
В50 |
GOST 6563-75 |
| Sheets and stripes |
В53 |
GOST 7221-80, GOST 24552-81 |
| Wire of non-ferrous metals and their alloys |
В74 |
TU 48-1-263-90 |
Chemical composition
| Standard |
Fe |
Cu |
Sb |
Pb |
Bi |
O |
Ag |
| GOST 30649-99 |
≤0.1 |
The rest |
≤0.002 |
≤0.004 |
≤0.002 |
≤0.01 |
87.5-88 |
| GOST 6836-2002 |
≤0.1 |
12.2-12.8 |
≤0.002 |
≤0.004 |
≤0.002 |
- |
87.2-87.8 |
Ag is the basis.
According to GOST 6836-2002, the copper content is the rest (in the table the calculated content is indicated). The total content of impurities should be ≤ 0.110%.
According to GOST 30649-99 the chemical composition is given for the jewelry alloy YUSRM 87.5 (USPR 875). The sum of the normalized impurities is ≤ 0.120%.
Physical characteristics
| Temperature |
r, кг/м3 |
| 20 |
10280 |
A description of the physical symbols
| Name |
Description |
| r |
Density |
Technological properties
| Name |
The value |
| Pressure treatment |
The alloy is suitable for all types of cold treatment. |
| Casting |
The alloy is suitable for all kinds of casting. |
