Advantages of Silicone Orings

Silicone orings

Advantages of Silicone Orings

Silicone orings retain their flexibility and low compression set over one of the widest working temperature ranges. They also offer good chemical resistance and non-toxicity.

FDA approved & medical compliant grade silicone is ideal for seals in food processing machines. It also has a great ozone & UV resistance and is physiologically neutral and insulating.

Temperature Resistance

Silicone has a high-energy silicon backbone with alternating oxygen atoms, making it more resistant to heat than most elastomeric materials. It also has good resistance to chemicals, fungus, and the weathering effects of UV exposure and aging. Its flexibility and ability to resist temperature extremes make it a suitable material for many different types of seals.

VMQ silicones (VMQ, VVM, and FVMQ) are FDA approved and medical compliant, with an operating temperature range down to -60°C. VMQ is not recommended for dynamic Silicone Parts Manufacturer sealing applications due to low tensile strength and compression set. However, it is an excellent choice for static applications that require resistance to extreme temperatures and chemical exposure, especially those that require a low volatile compound.

Hydrogenated nitrile rubber (HNBR) is another popular option. It is a synthetic elastomer made by saturating the double bonds in nitrile’s butadiene segments with hydrogen, and has great physical strength as well as resistance to chemicals, oils, ozone, and heat. Its excellent flex and fatigue life, along with its resistance to corrosion and aging, makes it ideal for a variety of static seals.

Fluorosilicones are an alternative to VMQ and VVM, providing better resistance to fuels and mineral oil but still not appropriate for dynamic sealing applications. They offer a working temperature range of -73°C to +220°C and are highly resistant to oxidation, acid degradation, and wear.

Chemical Resistance

Silicones are inert and don’t react with most chemicals. This characteristic makes them ideal for medical applications and for equipment that requires food-safe seals. They also work well in the automotive, aerospace and aviation industries because they have excellent flexibility under extreme temperatures.

Because silicones don’t react with many chemical compounds, they can withstand exposure to high-temperature solvents and fuels. They’re not recommended for dynamic application, however, because they don’t have the tensile strength or tear resistance of other seal materials. They’re also more permeable than other types of Silicone Parts Manufacturer O rings, making them unsuitable for direct contact with steam or oil.

For this reason, a layer of lubricant is often added between the o-ring and the other part it’s wedged between, in order to protect it from quick wear. O-rings can also be manufactured from other types of rubber, such as nitrile or fluorosilicone.

Fluorosilicone O-rings, known as FKM or FPM, combine the thermal stability of silicone with other chemical and environmental resistances that aren’t available in standard o-rings. This is why it’s popular in aerospace and automotive applications. It resists non-polar solvents, fuels, oils, and acids. It also has good low-temperature properties, a high tolerance to oxidation and aging, as well as a wide service temperature range.

Flexibility

Silicone o-rings are very flexible, which allows them to flex in a variety of applications, making them a popular choice for use in automotive and aerospace industries that require flexibility. They also offer outstanding electrical insulating properties in areas where strict performance standards apply and are FDA-approved for use in food handling equipment and appliances.

Unlike EPDM, silicone retains its physical and chemical properties over a very wide range of temperatures, from extremely cold to extreme hot. In addition to this impressive temperature tolerance, silicone offers excellent ozone and UV resistance, good dielectric stability, and is resistant to many oils, chemicals, and solvents.

Some types of silicone o-rings have low tear strength and abrasion resistance, which limits their effectiveness in dynamic applications. However, most silicone compounds can be made with high-tear or abrasion resistance by combining specific additives into the final formula.

Standard silicone compounds are peroxide-cured, while platinum-cured compounds have better flexibility and very low volatile material, which makes them more suitable for medical systems or other applications that require very clean seals. Both peroxide-cured and platinum-cured silicone can be compounded to be fire retardant or conductive, depending on the desired application. The ability to create specialty compounds is what makes silicone such a versatile material for o-rings. Find the right compound property for your needs using ESP’s online chart and order from the world’s largest inventory network.

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