Extremely low thermal-expansion coefficient, therefore there it has the greatly strengthened thermostability, does not distort under high temperature, even in oxidizing atmosphere it may undergo fierce temperature changes within 1100° C., very durable surface. The high purity of the chemical composition, thus the ingredient of the product and surface quality from pollution.

The excellently good ceramic physics performance guaranteed the stable performance under ambient temperature and the high operating temperature, with small size error and outstanding quality. With he reliable axle neck, the serial number and quality examination report, it has the traceability.