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What Is the Difference Between A Gasket and A Seal

Modify: May. 09, 2022

It is a common misconception that gaskets and seals are the same thing. While they do have similar functions in preventing leaks, gaskets and seals have different applications. In general, gaskets are used as static seals between flat surfaces, such as joints, while seals are used in dynamic environments between moving parts, such as rotating shafts, pumps and engines. Oil seal manufacturers are here to introduce you.


What is a gasket

A gasket is a ring or sheet of flexible material used in static applications to seal joints, flanges and other mating surfaces to prevent leakage. Depending on the material and application, gaskets can be produced using a wide range of manufacturing techniques, including
Rubber extrusion
Hot vulcanization and cold bonded splicing
Compression, injection and transfer molding
Precision slitting
Custom die-cutting
Waterjet cutting
Gaskets and seals can be found in virtually every application and industry, including oil and gas, manufacturing and industrial applications, pulp and paper production, and agricultural equipment.
Worn or damaged gaskets are easily replaced. It is often recommended that gaskets be replaced when disassembling and reassembling equipment.



What is a seal

Seals are a broader category that includes O-rings, valve stem seals, rotary seals and mechanical seals. Unlike gaskets, which are typically used in static applications, seals are found in more active environments such as motors, engines, pumps and rotating shafts. Seals tend to be flat and round, with an angled rubber inner ring surrounded by a metal outer ring. The sloping angle of the seal's inner layer helps prevent leakage in dynamic applications. Seals are typically used to prevent leakage between two moving parts and to prevent particles and contaminants from intruding into the system.
The process of replacing a broken or damaged seal can be very complex. Not only the seal, but the entire assembly may need to be disassembled to gain access to the seal and allow for replacement.



Gasket and Seal Materials

Seals and gaskets can be made from a variety of materials, depending on their intended use. Common materials used to make gaskets and seals include
Nitrile rubber
EPDM rubber
Fluoroelastomers (FKM)
Natural rubber
Synthetic Polyisoprene
Thermoplastic Rubber (TPR)



Solutions from HONGLEI

At HONGLEI, we pride ourselves on providing the highest quality rubber gaskets and oil seals in the industry. We manufacture your gaskets and seals to meet the most detailed specifications. Whether you need a simple gasket or a complex sealing solution, our knowledgeable and experienced engineers and experts will help you find the best seal material and design for your needs.


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