What is an O-ring? How many types of O-rings are there? and working principle of O-ring

what is oring

An O-ring (oring) is a seal with a circular cross-sectional area. and has a circular shape as well Made from flexible materials There are both natural rubber. and synthetic rubber with some substances mixed into it to increase Features to be able to be used in a variety of applications, such as being used as a seal for leakage by installing in various joints Used with mobile devices such as cylinders in hydraulic systems. (Reciprocating Seals) or used in compressed air (Pneumatic Seals)

How does O-ring work?

O-rings are installed in the parts in two types: Seals, Static Seals, and Rotary Seals, which can work well in places. with compression force which is the compression of the O-ring that causes the O-ring surface with the solid surface of solid materials, no gaps for liquids or gases to escape through

Rotary Seals

Static Seals

How many types of O-rings are there?

type or type of o-ring will be divided according to the raw materials used for production and the nature of the main use which O-ring is produced and used a lot in both industries, the main ones are as follows

1. O-ring NBR

NBR o-rings are o-rings made of nitrile rubber (Buna-N, NBR) that are widely used. It has a certain degree of oil and heat resistance in the temperature range of -40 °C to 120 °C (oil) or 90 °C (water), while being flexible and compressive. Nitrile rubber also has better mechanical properties compared to other rubbers and has high wear resistance.

2. O-Ring Viton

Viton O-rings or Viton® O-rings are made from fluorocarbon rubber that has the properties to resist high temperatures in all environments such as air, hydraulic oil, fuel, solvents, or certain chemical solutions, in tons, with a temperature range of -15 °F to 450 °F (-26 °C to 232 °C).

3. Silicone O-ring (Silicone, VMQ)

Silicone O-rings are made from silicone. which is a rubber that covers a group of materials vinyl-methyl-silicone (VMQ), which is usually the intermediate ingredient, has relatively low tensile strength, is easily torn, and has poor wear resistance. But silicone has better heat resistance to 450 °F (232 °C) and cold conditions as well at -75 °F (-59 °C).

4. EPDM O-ring

EPDM O-Rings are made from polyethylene (ethylene) and propylene (propylene). Ethylenepropylene diene-(EPDM) rubber has the ability to withstand temperatures from -65 °F to 300 °F (- 55 °C to 150 °C)

O-ring size

The size of an O-ring is determined by the O-ring inside diameter (ID) and thickness (O-ring cross section (W), or the outside diameter minus the inside diameter of the O-ring, such as an O-ring with a diameter of 20. mm, thickness 2 mm, called O-ring, size 20x2 mm