Second, we must understand the testing methods of mechanical seal life. Life test is destructive testing, mechanical seal drawing, life measured out, the mechanical seal type, mechanical seals will be scrapped. Therefore, the life of the mechanical seal is used sampling test. extracted in the same large number of materials, processing conditions, mechanical seals in a small sample for testing, mechanical seals, according to test results to estimate the life of these mechanical seals, because the seal factory inspection of each product is not necessarily members to achieve life expectancy. Since the two were using SSiC and M106D friction rubber bellows as well as elastic element, then the metal gland material should be Ha Ha formula B or type C, and if not then the mechanical seal gland It is intolerant of acid corrosion