Silicone, frequently abbreviated as VMQ, is a rubber compound used in applications like waterproof housings, automobiles, and medical devices.
Silicone O-rings can be used for a wide temperature range, are weather resistant, have a good compression set, and have good electrical properties. Silicone O-rings are an excellent choice for many applications.
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Silicone O-rings are used in a variety of applications. Some of the most common uses are:
Silicone O-rings can be the correct sealing option for many applications due to their mechanical properties and low cost compared to other materials like fluorosilicone.
These properties include:
Silicone O-rings resist animal and vegetable oil, grease, ozone, and oxidative environments. This means silicone O-rings can be used with several lubricants and outdoors..
Silicone O-rings are a widely used seal, especially in the food and beverage and electrical industries. These O-rings have many benefits, with a high-temperature range, excellent resistance to outside environments, low electrical conductivity, and low cost compared to similar materials.
General applications include:
Due to the mechanical properties of this seal, VMQ O-rings are not recommended for dynamic sealing operations and should only be used for static applications.
In a static application, if resistance to a wide temperature range, waterproofing, or dust proofing is required, VMQ O-rings are the right fit.
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The standard durometer range is from 50 Shore A to 80 Shore A. However, most Silicone O-rings have a 60 Shore A or 70 Shore A hardness.
Silicone or VMQ O-ring temperature ranges are standard from -60°C (-75°F) to 232°C (450°F). These temperatures are based on dry air; the actual temperature range depends on end-use application and will vary. Contact us for more details.
Dimensions of Silicone O-rings can vary significantly based on application. Whether metric or imperial sizes are required, many sizes can be produced. See our O-ring size chart for some of the most common sizes we offer, or contact us to discuss a size not shown.
For many applications, Silicone O-ring will be a standard rust color. However, the O-rings can be made in a different color in other applications. These can include high-visibility colors. For more information on what colors are available, contact us.
Silicone is a rubber polymer made from silicon, oxygen, hydrogen, and carbon. However, other elements can be used in place of carbon and hydrogen. By having a chain of alternating silicon and oxygen with the additives, low toxicity, high-temperature resistance, and good electrical insulation can be achieved.
There can also be specially formulated VMQ O-rings for certain applications. For instance, the food and beverage industry will require an FDA-Approved food grade Silicone O-ring. This means the materials used must meet strict standards established by the Food and Drug Administration.
Silicone is an excellent material to meet these standards as it does not produce a smell or taste. Other unique formulations could also be used for medical and pharmaceutical applications.
Silicone O-rings can be produced by injection molding, compression molding, or extrusion.
Although a round O-ring is standard, Silicone O-rings can be made into other cross-sections. These cross-sections are dependent on application. Contact us for more details.
All VMQ O-rings must be lubricated to work correctly. The lubrication depends on the specific application but is generally a form of oil, fuel, or grease.