Why Silicone Orings Are a Good Choice for Sealing Parts in Difficult Environments

Why Silicone Orings Are a Good Choice for Sealing Parts in Difficult Environments

Silicone orings can cope with a lot of things that degrade other rubbers. This includes exposure to sunlight, UV rays and ozone.

This makes them a good choice for parts that need to work outdoors. They also have good electrical properties. Silicone is FDA-approved for food handling equipment and appliances.


Heat is one of the leading forces that can deteriorate mechanical systems, which is why it’s essential to have heat resistant o-rings in place. A high-temperature o-ring provides a durable sealing solution in the most demanding environments, ensuring smooth functionality. These o-rings are commonly used in the aerospace, automotive, chemical processing, and oil & gas industries.

Silicone orings are manufactured with a high-performance elastomer that can withstand extreme temperatures while still maintaining their flexibility. It is also a non-toxic and environmentally friendly material that can be utilized in various applications. Additionally, silicone orings Silicone Parts Manufacturer offer resistance to a variety of factors such as weathering and UV exposure.

Unlike EPDM, silicone has excellent high-temperature stability and can resist temperatures ranging from -60degC to 232degC. It also offers good ozone resistance and is highly resistant to chemicals, water, and oils. Silicone orings are also able to resist steam autoclaving, dry heat, ethylene oxide, electron beam radiation, and gamma radiation sterilization processes, making them an ideal seal for medical and pharmaceutical equipment.

While silicone has many desirable properties, it isn’t as strong as other materials and is limited in its abrasion and tear resistance. Therefore, it is best for static sealing rather than dynamic applications. It’s also not recommended for use in contact with Skydrol, ethers, and esters. For better performance in dynamic applications, a fluorosilicone o-ring is a suitable alternative.

Chemical resistance

A key factor to consider when selecting an O-ring is the chemicals it will be exposed to. Chemical resistance refers to how well an elastomer can withstand degradation from chemicals, including degradation caused by thermal expansion and compression. Chemical resistance can also be impacted by the curative used to treat the rubber, as well as its molecular structure.

Silicone O-rings are resistant to a broad range of chemicals, including ozone and UV radiation. They are non-toxic and fungus resistant, making them ideal for use in the food and pharmaceutical industries. Unlike some other O-ring materials, silicones do not leach into foods or cause cytotoxic reactions. They are also ozone- and UV-resistant, providing superior longevity and performance.

Engineered Seal Products offers silicone (VMQ) O-rings that meet all the above requirements, as well as other high-performance elastomers for demanding applications. Our team of engineers, quality experts and supply chain professionals can help you select the right silicone O-ring for your needs.

Fluorosilicone is a saturated variant of silicone that features stability and compression set resistance across one of the widest temperature ranges of all elastomers. It is a popular choice for automotive, aerospace, and electronics applications that require static sealing and cushioning.


Silicone orings are an excellent choice for many applications that require high chemical and temperature resistance. They are easy to clean, have low outgassing and are odorless. They also resist fungus and bacteria. They are also insulating and flexible. These properties make them ideal for use in medical equipment, jewelry and food processing machinery. They also provide a tight seal in fluid systems.

They are also able to withstand extreme temperatures, with some types being rated down to -60degC. They are also resistant to UV radiation, ozone and many oils. However, they do not perform well in dynamic applications and have inferior tear and abrasion resistance. Other rubber o-rings offer better performance in dynamic applications.

Other o-ring materials that meet FDA standards include HNBR, Viton, and Neoprene. Using these materials in Silicone Parts Manufacturer your applications will ensure that the product is safe for use by your customers. Choosing the right material depends on the application and the environment.

Silicone o-rings are available in both round and flat styles, and come in both metric and imperial sizes. They are also available in a metal detectable version that meets FDA regulations for food production lines. Choosing the correct size is important to ensure that the o-ring can fit properly and create a tight seal. Also, consider whether the o-ring needs to be lubricated or not.


Silicone has an excellent compression set, which means it retains its shape and is able to return to its original configuration after stress or pressure. This resilience makes it a good material for sealing parts under high loads. It also has good resistance to water, ozone, abrasion and weathering, making it ideal for outdoor applications. Additionally, silicone has great elasticity, meaning that it is able to stretch and adapt to changing conditions without deforming.

VMQ is often used in the production of O-rings, and it can be made into many different shapes and sizes. It is also odorless, non-toxic and will not grow mold. Additionally, it has good chemical resistance to engine and transmission oil, animal and vegetable oils, brake fluid, diluted salt solutions and most hydrocarbon-based fuels.

While silicone o-rings are an excellent choice for static applications that require extreme temperature resistance, they should not be used in dynamic environments because of their poor tear and abrasion resistance. Fortunately, there are other rubber O-rings that can provide more well-rounded performance for these applications.

Marco Rubber & Plastics has the world’s largest inventory of standard and custom o-rings, including a wide variety of specialty compounds. Find the right o-ring for your application online today. You can even use our handy o-ring calculator to see the exact dimensions you need.

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