O-ring is a circular rubber sealing ring with a circular cross-section, mainly used for mechanical components to prevent leakage of liquid and gas media under static conditions. In some cases. The O-ring can also be used as a dynamic sealing element for axial reciprocating motion and low-speed rotational motion, and different materials can be selected to adapt to different conditions. O-shaped sealing rings are currently one of the most commonly used sealing rings. Due to the different working conditions used, the requirements for sealing rings are mostly different, resulting in many types of sealing rings. So, what are the common materials for O-shaped sealing rings? Under what circumstances is it generally applicable?
Reli Tool tells you that common materials include hydrogenated nitrile rubber, nitrile rubber, silicone rubber, fluorine rubber, fluorosilicone rubber, butyl rubber, etc.
1. Hydrogenated nitrile rubber
It has good corrosion resistance, compression resistance, and tear resistance, as well as resistance to ozone, sunlight, and oil pollution. It is suitable for O-ring seals in automotive engines, washing machinery, and new ring refrigeration systems. However, it cannot be used in esters, alcohols, and aromatic solvents.
2. Nitrile rubber
Low cost and widely used, generally used in media such as water, silicone oil, and glycol hydraulic oil, but not suitable for use in polar solutions such as ozone and ketone nitrohydrocarbons.
3. Silicone rubber
It can withstand cold, heat, ozone and atmospheric aging damage, but its tensile strength is poor and it does not have oil resistance. It is generally used for O-ring seals on household appliances, such as microwave ovens, water heaters, electric irons, water dispensers, kettles, etc.
4. Fluororubber
It has good ozone resistance and weather resistance, and its high-temperature resistance is also better than silicone rubber, but its cold resistance is poor. Generally used in fuel systems and O-ring seals in chemical plants, it is not recommended to use them in mixtures of ketones and nitrates.
5. Fluorosilicone rubber
Fluorosilicon rubber combines the advantages of silicone rubber and fluororubber, and can resist the erosion of oxygen-containing compounds, fluorinated solvents, and aromatic solvents. It has good performance in oil resistance, fuel oil resistance, and solvent resistance. O-ring seals commonly used in military and aerospace fields are not recommended for use in brake oil and ketones.
6. Butyl rubber
Good heat resistance and airtightness, able to resist the invasion of sunlight, polar solvents, and ozone, and has good insulation. It can be exposed to oxides or animal and vegetable oils, and is generally used as an O-ring in vacuum equipment and chemical resistant drugs. It cannot be used together with petroleum, aromatic hydrocarbons, or kerosene.
