How to choose an O-ring?

The O-ring is a sealing ring widely used in various machines and devices. It is one of the most effective sealing rings, ensuring a leak-free connection between parts. But how do you choose the proper O-ring?


O-rings are made from various materials, such as rubber, fluoroelastomer, neoprene, etc. The choice of material depends on the application, temperature, chemical composition, and other factors. For instance, selecting a chemical-resistant material is advisable if the O-ring comes into contact with chemicals.


The size of the O-ring is also crucial. A smaller O-ring may not ensure sufficient sealing, while a larger one may not fit properly and could cause leaks. To choose the right size, one should measure the diameter and cross-section.

Pressure and Temperature Resistance

When selecting an O-ring, pressure and temperature resistance should also be considered. Pressure and temperature tolerance limits vary between materials and should be carefully chosen based on the application.


O-rings come in various shapes, including circular, rectangular, and tubular. Choosing the right shape depends on the application and the shape of the component.


The choice of O-ring also depends on the application. For example, if the O-ring is used in medical devices, selecting a material that meets the requirements for medical equipment is essential.

The selection of O-rings should consider various factors, such as material, size, pressure and temperature tolerance, shape, and application. The fitting O-ring ensures effective sealing and a leak-free connection.