Generally speaking, the material of the sliding seal is usually chosen silicon carbide (SiC). The combination of the materials in contact with each other carbide - carbon or carbide - carbide compared with a combination of materials of silicon carbide - silicon carbide has a better resistance to corrosion performance and the performance of the anti-corrosive medium. Even so, the user of the pump must have a little "spirit of sacrifice" to make some concessions and compromise: in the case of dry friction oil loss in a short time, the poor performance of the silicon carbide material seals; Moreover, this material a sealing member in limited use in the hot medium. In these use cases, ESK ceramic material provides a high quality material called SiC-G (Ekasic-G): a carbon-containing, direct sintered silicon carbide material. Constitute a hard - hard and hard - soft pairing material combinations. Adding carbon particles have the same role in dry friction agent, in the case of oil loss in a short time (no lubrication medium dry run) has good frictional properties - an increase sliding seals to extend the life of the adverse working conditions an important measure. Also reflects the good results in the use of this material in demineralized water. Other silicon carbide materials in demineralized water easily corrode, SiC-G is not susceptible to corrosion.