Seals have a wide range of uses in life.Basically,things that have something to do with machinery will use seals.As big as cars and airplanes,as small as lighters,mice and so on.All have to use seals.There are many types of seals,which can be divided according to the raw materials:compared with common silicone rubber seals,fluorine rubber seals,ethylene-propylene rubber,polytetrafluoroethylene,neoprene,polyurethane and so on.According to the usage,it can be divided into:acid-resistant seals,alkali-resistant seals,high-temperature-resistant seals,low-temperature-resistant seals,oil-resistant seals,and so on.Many machinery cannot operate without seals,such as oil seals.If there is no oil seal,oil may leak and the machinery cannot operate.I often see news about the leakage of crude oil on TV.In fact,it means that the seal is not done well.Perhaps the quality of the seal is not good.The seal is an important part of the machine and has an important effect on the operation of the equipment.In order to prevent foreign matter from entering,it is necessary to use seals in the machine.

Seals with different uses can work in different environments.For example,high and low temperature environment,acid and alkali solutions,oil resistance,etc.Different materials should be selected for seals operating in different environments,such as the high temperature resistance of fluoro rubber.Sometimes the hardness of the seal is also an important factor that affects the application in life.Not all seals are soft,for example,PTFE seals are quite hard.Mechanical seals should be checked frequently,and abnormalities should be replaced in time,such as seal deformation,cracking,etc.The main factor affecting the service life of the seal is the operating environment.Temperature is the main factor affecting the hardness of the seal.In order to increase the elasticity of the seal at low temperatures and reduce the permanence of the material shrinkage,it is necessary to improve the formulation of the material,and a certain amount of plasticizer must be added to the rubber.Long-term immersion in the operating medium,the plasticizer will gradually be absorbed by the operating medium,resulting in a shortened seal aging.Therefore,the seals should be checked frequently.Avoid the occurrence of accidents caused by aging.