![]() ![]() Nitrile can be used in applications that come into contact with varying temperatures, including high temperatures. While Buna O-rings are more cost-effective than fluoroelastomers, they are vulnerable to high temperatures above 149° C. Its resistance to weather and ozone damage is significant but can be improved with the addition of other compounds. Buna-N is a nitrile-based synthetic product that has excellent abrasion and tear resistance and withstands exposure to some solvents. However, it is vulnerable to higher temperatures and chemicals such as brake fluid and halogenated hydrocarbons.īuna is for sturdy, general-purpose O-rings. The material has a strong operational temperature range from -50° C to 120° C, and hydrogenated nitrile can withstand temperatures up to 150° C. Nitrile can be compounded and processed into several different forms. Nitrile is a resilient elastomer used in a wide variety of industries, such as aerospace and heavy duty equipment. Nitrile O-Rings (Buna-N or Acrylonitrile Butadiene Rubber O-Rings) Pure silicone O-rings cannot withstand much in the way of wear, tearing, and other physical damage, so it’s best suited to static applications.Ĭommon industries that rely on silicone O-rings include: The material can handle a wide temperature range between -84–232° C, and resists damage from water, acids, ozone, UV radiation, and heat. Silicone O-rings are important components in outdoor and plumbing systems. PTFE O-rings are commonly found in applications such as automotive steering, chemical processing gaskets, chemical storage, and paint guns. Suitability for high-pressure applications.Resistance to cracks, stress, and chemicals.Temperature resistance up to temperatures of 575° F.PTFE is known for its viability in extreme conditions. However, the material is rigid and can be difficult to apply to dynamic or moving parts. The material can stay chemically inert and resistant to abrasion at temperatures ranging from -73° C to 260° C. One of PTFE’s most unique characteristics is its resilience to heat and cold damage. Once you’ve determined whether you need a dynamic or static O-ring, you’ll need to select the appropriate O-ring material. Dynamic O-rings are classified based on the type of motion they need to withstand, such as reciprocating dynamics or rotary motion. Not only do these O-rings need to be made from more resilient materials, but they also need more frequent maintenance and lubrication. Most O-rings are considered static axial seals-they create a tight seal between two parts that don’t move in relation to each other and can be made from materials with lower abrasion and tearing resistance.ĭynamic O-rings, however, hold a seal between moving parts. Four of the hardiest specialty O-ring materials are PTFE, Viton, silicone, and nitrile. ![]() Some materials are used throughout general applications, while more extreme applications tend to default to certain materials with time-tested characteristics. Two of the most important characteristics to look at when choosing O-rings include: O-Ring Operating Temperatures and Applications ![]()
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