DMS SEALS TECHNOLOGY CO.,LIMITED

DMS Seals - Hydraulic Seals and Oil Ring Seals Manufacturer & Supplier

The Professional Sealing Solution Supplier(O Ring Suppliers & Oil Seal Manufacturers).

What is the life of rubber seals and why they fail

by:DMS Seals     2022-02-13


The service life of rubber seals is generally divided into long life, medium life and short life. For example, when the life of the lip seal ring of the rotating shaft is greater than 1000h, it can be called long life; 400~600h when it starts to leak, it is called medium life; if it leaks within 100h, it is called short life. If the radial lip seal is used for more than 1000h, it can be called long life; 400~800h is called medium life; 100h or less is called short life.








Choose appropriate rubber seals, and their service life can reach medium and long life. At this time, the main reason for the failure of the seal is the aging of the rubber material or the wear of the lip of the seal. The failure of seals with a service life of less than 100h is usually due to improper selection of the surface roughness of the seal structure, elastomer or shaft.








The pressure surface of the radial lip rod seal is lip-shaped, which makes the lip fully contact with the sealing surface to produce a sealing effect. It is widely used in the dynamic sealing of reciprocating hydraulic cylinders.








The rotary shaft lip seal, also known as the oil seal, is mainly used as a seal for the rotary shaft of the low-pressure fluid medium. Its function is to prevent the medium from leaking out along the shaft and the intrusion of external dust and impurities.








The main factors affecting the failure of rubber seals







Selection and assembly quality


Improper selection and selection of unqualified seals (such as poor lip, local deformation, hardening; self-tightening spring corrosion and unqualified size, etc.), often appear to replace a bad one. In addition, during assembly, local deformation of the seal caused by forced pressing, and the sealing surface is scratched by burrs on sharp edges such as splines and threads, etc., will cause seal failure.







When selecting, the shape, type and material of the sealing ring should be reasonably selected according to the type of seal, the type of working medium, the pressure, the temperature and the relative movement speed between the two paired parts being sealed.


Before assembly, carefully check whether the selected seals are expired, aged, deformed, etc. At the same time, each sealing surface should be thoroughly cleaned, and the assembly place should be free of sand; during assembly, special tools should be used to press in to ensure the seal Concentricity with the shaft, especially when there are threads, keyways and splines on the shaft, must be inserted with a guide sleeve.







Improper selection of oil and pollution


Improper selection of oil is mainly manifested in the compatibility with rubber seals. If the used oil has poor compatibility with seals, it will accelerate the deterioration of the rubber compound, the swelling and aging of the seals and the generation of unsinkable sludge. etc., accelerate the wear of the seals and cause the seal to fail. Therefore, the compatibility with rubber materials must be paid attention to when selecting oil.







Improper management of seals


The chemical composition of rubber seals determines that the storage and management must meet the specified requirements. The investigation found that the unreasonable management of rubber seals due to placement, storage and transportation is the main factor causing the early failure of the seals. Therefore, attention must be paid to the daily management of rubber seals.







Other Factors

(1) Working temperature and environmental conditions


The working temperature of the oil in the system and the temperature around the seal are too high, which can easily cause the rubber to soften, expand, harden and crack; in addition, the harsh external environment and a lot of dust will cause different degrees of damage to the lip of the seal. wear and tear.







(2) Air is dissolved in the system

If there is air in the system, a large number of air bubbles will be generated in the oil. When the air bubbles reach the inner pressure surface of the rod seal, a large amount of energy will be released rapidly, resulting in serious damage to the lip of the rod seal; When there is too much oil vapor in the system, and the pressure and temperature reach a certain value, it will cause the oil to 'self-ignite




In the past few decades, rubber seal ring manufacturers production has increased because of the use of seal manufacturers.
All of the experts Dms Seals Technology Co.,limited consulted stressed that the best recovery plans are the ones made before you need them, not afterward.
The value you get from watching how Dms Seals Technology Co.,limited operates and runs our company and the potential mentorship you would get from us will go a long way towards helping customers understand our company.
Dms Seals Technology Co.,limited expects to reach the desired profits in the first year and does not anticipate serious cash flow problems.
Like anything else in rubber o rings manufacturers, there are a variety of choices and types to choose from, and each of them will affect your budget in some form. Dms Seals Technology Co.,limited offers a range of quality at competitive prices.
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