| Graphits products | Graphite seals for various purposes. Inserts for bearings | Antifriction carbon-graphites of Nigran-VKh, Nigran-V, Nigran brands |
Antifriction carbon-graphites of Nigran-VKh, Nigran-V, Nigran brands
Material Nigran-VKh has a unique, even by world standards, gas-tight - 1.5·10-5 cm2/sec. For comparison, produced Russian company FSUE MMPP Salut anti-friction graphite brand PUMA-C, also created instead Nigran-V, gas tightness is a hundred times below: 3·10-3 cm2/sec In addition, the material has very high strength characteristics. Its compressive strength rarely falls below 200 MPa, which is 1.6 times higher Nigran-V. The unique properties of carbon-graphite Nigran-VKh, enable its use not only as a radial seal oil systems of aircraft engine compressor, but also in the mechanical seal friction units of pumps, which work in acidic (to a lesser extent - alkaline) aggressive medias and other pumping technology chemical and petrochemical industries. Besides, LEG ltd produces an analog of the soviet material Nigran - Nigran-Kh. Physical and technical characteristics of these materials are given in the table below. Our company produces a blank and ready-made products, which are confirmed by quality certificates. |  |
Material | Density, g/cm3, | Compressive resistance, MPa, av. in selection | Acceptable operating temperature, °С | Air-tightness under nitrogen pressure 0,98 MPa | Manganese weight content, %, av. in selection | Water uptake, %, av. in selection | Electrical resistivity, mkOm*m, not more |
| ATG | 1,82 | 130 | 650 | - | 0,27 | - | 14 |
| AG-2500PM | 1,85 | 75 | 650 | - | 0,32 | - | 12 |
| Nigran-VKh | 1,82 | 200 | 300 | Air-proof | - | - | 32 |
| Nigran-V | 1.80 | 130 | 300 | Air-proof | - | - | 32 |
| Nigran-Kh | 1,74 | 150 | 300 | - | - | - | 32 |
| Nigran | 1,65 | 85 | 300 | - | - | - | 32 |
| Khimanit | 1,9 | 110 | 300 | Air-proof | - | - | 12 |
| AG-2500 VKP | 1,92 | 180 | 300 | - | - | - | 14 |
| AG-1500-3 | 1,89 | 105 | 300 | - | - | - | 12 |
| AG-2500 | 1,82 | 120 | 450 | - | - | - | 14 |
| AG-1500 | 1,8 | 80 | 450 | - | - | - | 12 |
| AG-2500 СО5 | 2,9 | 170 | 300 | Air-proof | - | 0,08 | 8 |
| AG-1500 СО5 | 2,9 | 110 | 300 | Air-proof | - | 0,1 | 8 |
| AG-2500 Б83 | 2,4 | 200 | 230 | Air-proof | - | 0,1 | 9 |
| AG-1500 Б83 | 2,5 | 110 | 230 | Air-proof | - | 0,08 | 9 |
| AO-2500 | 1,72 | 130 | 400 | - | - | - | 32 |
| AO-1500 | 1,65 | 98 | 400 | - | - | - | 32 |
| AO-2500 СО5 | 2,6 | 200 | 300 | Air-proof | - | 0,08 | 8 |
| AO-2500 Б83 | 2,6 | 210 | 230 | Air-proof | - | 0,08 | 9 |
