Common elastomers for use in aerospace-type applications include nitriles, ethylene-propylene, fluorosilicones and more. Up to a point, this will create a tighter and tighter seal, but its vital not to put more stress on an o-ring than its designed to handle, as too much deformation will eventually cause the seal to start leaking again. Since 1980, our solutions have delivered reliable, long-lasting success for customers worldwide. OurMaterial Properties Comparison Chartalso provides useful information on chemical resistance, heat resistance and other factors that aid in the O-ring material selection process. Ethylene propylene is often used outdoors where weather resistance is a concern, as well as in automotive cooling and brake systems. Available in standard translucent or black 70 or 90 durometer, with custom colors available. The resulting o-ring seal is both economical and reliable, as well as relatively resilient and easy to maintain/replace when needed. However, as a rough guide to o-ring temperature rating and use limits, some of the more popular materials on sale generally operate within the following sorts of temperature ranges: Hydrogenated nitrile: anywhere from -45 C to 150 C, Polyacrylate: anywhere from -25 C to 175 C, Ethylene-propylene: anywhere from -50 C to 135 C, Chloroprene: anywhere from -40 C to 120 C, Butyl (petroleum compound): anywhere from -55 C to 205 C, Fluorosilicone: anywhere from -60 C to 205 C, Fluorocarbon: anywhere from -25 C to 205 C. High-pressure resistance is a common requirement of industrial o-rings, along with reliable performance in high temperature and dynamic environments. Whether you need high temperature o-rings, low temperature o-rings, high pressure o-rings, or o-rings with excellent chemical resistance, allorings.com accesses the worlds largest inventory network of high performance o-rings. Available in standard back or custom colors. Securing the best choice in any given scenario will generally be a balancing act between the specific operating temperature needed, and the most economical material option at that performance point. View site-wide list of registered trademarks. Despite the abovementioned characteristics, experts do not recommend silicone O-rings for dynamic applications. 14450 John F Kennedy Blvd Theyre commonly used due to the inherent resilience of stainless steel o-rings, which means seals can spring back promptly once pressure is reduced. Its important to get the balance right between o-ring material, size and working environment in order to fulfil the role you need it to perform. Abrasion and extrusion resistant materials should be considered as well as smaller clearence gaps, backup rings or metal spring energized PTFE seals for pressure cycling applications. If you would like more information about o-rings and/or backup rings in regards to your high-pressure application, please give us a call at 832-448-5550 or submit a contact form with your specifications. In dynamic applications, if the friction of the moving metal surface across the o-ring is in the same direction as the pressure, the o-ring can potentially be dragged into the gap. With backup rings providing added extrusion resistance, the gap is all but eliminated to allow essentially zero clearance. Need a compound not shown here or not sure what is best for your application. We provide O-rings for industries ranging from oil and gas to aerospace and offer both standard and custom options. Rocket Seals distributes high pressure O-rings manufactured in standard inch and metric sizes as well as custom configurations. This highly versatile O-ring material is used in various applications including medical devices, automotive, household appliances, and more. At higher pressures and larger clearance gaps, the o-ring material must have enough strength to resist extruding into the clearance gap. They include but are not limited to operating conditions, chemical compatibility, sealing pressure, temperature, durometer, size, and cost. If you still have questions about after reviewing this material selection guide, we encourage you to, PTFE yields some of the toughest O-rings on the market with an outstanding temperature range of -300 to 450F. How much pressure an o-ring can handle depends on several factors: The relationship between fluid pressure, clearance, and durometer is expressed visually in the graph to the right. Nevertheless, experts do not recommend EPDM compounds for gasoline, petroleum oil and grease, and hydrocarbon environments. At 50% or more it becomes a high nitrile product, intended for use in hydrocarbon applications, while below 18% is considered low nitrile for use in very low-temperature systems. Offering outstanding chemical and high-temperature resistance, fluorocarbon O-rings are among the most durable and versatile available. Aircraft o-rings and aerospace o-rings generally need to be highly chemically resistant, and able to operate within a wide range of temperatures and pressures in order to keep an aerospace crafts powertrain running cleanly, efficiently and smoothly. The trade-off is that PTFE is, Arizona Sealing Devices, Inc. has extensive experience with all of these elastomers, and we take pride in matching our clients to the materials that will suit them best over time. Resistant to: Extreme cold, steam, hot water, sunlight and UV, dilute acids, ketones, alkalis, Not recommended for:Petroleum base oils and di-ester base lubricants, Hardness Range:40 to 90 durometers Shore A. Neoprene is a general-purpose elastomer with moderate resistance properties to petroleum oils and weather (ozone, sunlight, UV, and oxygen). Terms & Conditions. Nosotros tambin. Due to many applications, there is also a wide variety of O-ring material choices available. Typical applications include fuel cap gaskets, fuel system o-rings, and valve cover seals. Fax: 832-448-5551 Learn about high pressure o-ring groove design and clearance gap considerations. For more information on o-ring groove design, click here. We stock all major compounds including Buna (Nitrile), Viton (FKM), EPDM, Silicone, Teflon, Aflas, etc. Metallic o-rings and metal o-ring seals are often found where an extra hard-wearing gasket is required in high temperature or high-pressure components, in heavy machinery and industrial sectors. For use in an engine, an oil o-ring has to be created specifically from compatible hybrid materials that allow it to maintain crucial o-ring properties (flexibility, incompressibility) while offering more robust resistance to heat, pressure, o-ring leaking and chemical attack than a standard elastomer typically could. Ethylene-Propylene rubber materials are characterized by excellent chemical, steam and thermal resistance for a relative low cost. Different types of dynamic movements - for example, rotary, reciprocating and oscillating - demand that o-rings be manufactured with different material qualities to perform to the optimal level. Privacy Policy | Site Map | Site Credits: Ecreativeworks, Ace Seal is a global manufacturer of custom o-rings, seals, gaskets and other molded rubber & plastic components, synthetic rubber with excellent oil resistance and fair to good chemical resistance, synthetic rubber providing excellent chemical resistance and heat resistance, family of perfluoroelastomer compounds that provides excellent chemical, heat, oil and abrasion resistance, synthetic rubber with excellent weather resistance and good heat and abrasion resistance, elastomer with excellent abrasion resistance and weather resistance, and good oil resistance. Often used in food, water, beverage and agricultural systems, hydraulic, braking, steam applications. They also have improved resistance to amine-based oil protectants. Nitrile rubber materials are the most commonly used general purpose o-ring material because of relative low cost, good mechanical properties, and performance with many basic oils, fuels, and lubricants. In this section, well look a little more closely at what o-rings do, and some of the applications that theyre very often used for. The wider the clearance, the higher the probability for the o-ring to be extruded. While all o-rings require some degree of lubrication in order to perform to optimal levels, dynamic o-rings require heavier and more frequent lubrication (as well as more regular checking, maintenance and replacement) than static versions. Millable polyurethane is resistant to high-pressure hydraulic fluids, abrasion, oil, grease, cracking, and many chemicals. To learn more about Arizona Sealings personalized service and extensive product line,request a quotetoday. Has an operating temperature of -20F to 400F (-29C to 204C) and a hardness range of 50-95 durometer. When picking the right O-ring for your specific application, there are many factors to consider. For a high-pressure seal to work to optimal levels, o-ring design and manufacture again depends on choosing specific materials for better performance under specific conditions. Perfluoroelastomers (FFKM) are an extension of the Fluorocarbon FKM elastomers extending the compatibilities of the FKM while at the same time extending the upper temperature limits of the materials while compromising the lower temp limits. This can occur at less than half the pressure of what it normally takes to cause extrusion. Like their fellow elastomers, theyre widely used in many industries where theyre prized for excellent abrasion and tear resistance, suitability for use with some solvents, and for being considerably cheaper than fluoroelastomers. The low strength and poor abrasion resistance as well as high gas permeability, make them not compatible with the most petroleum fluids, ketones, water, and steam. Learn more about PTFE and elastomer backup rings for use in high pressure applications, Learn more about metal spring energized PTFE seals for use in high pressure applications. Like cast polyurethane, it does well under dynamic, heavy loads, even when used outdoors. Temperature Range: Standards -15F to +400F, but some Parker FKM Viton compounds can tolerate temperatures down to 65F and up to +450F. Hydrogenating nitrile yields a more highly saturated chemical structure with correspondingly higher strength and chemical resistance. Copyright 2022 Marco Rubber and Plastics. The durable material is frequently used in chemical processing and automotive applications. However, fluorosilicone is not a good choice for dynamic sealing of any kind due to its low strength and limited abrasion-resistance.. Common applications include hydraulic fittings, valves, cylinders and pneumatic tools. If you dont see the material you need listed, let us know! In this guide, we consider common O-ring materials in detail, including their strengths, limitations, and common applications. Resistant to: Dry heat (air to 400F) and high aniline point oils, Not recommended for:Most petroleum fluids, ketones, water and steam. In the UK, this applies to natural and synthetic rubbers, elastomers and polymers. A synthetic rubber with excellent weather resistance and good heat and abrasion resistance. They provide excellent and robust sealing properties in static applications but are often unsuitable for dynamic environments; metal o-rings are best when used as standard gaskets. Arizona Sealing Devices, Inc. has extensive experience with all of these elastomers, and we take pride in matching our clients to the materials that will suit them best over time. On the whole, static o-rings are created from less robust and hard-wearing materials than their dynamic equivalents. The o-ring, generally made of some form of elastomer, sits in the join between these two parts, and becomes compressed in order to help form a tight seal. All rights reserved. Viton o-rings are a popular alternative to the widely-used nitrile seals. This material is ideal for static sealing applications and is widely used by the aerospace industry. Polytetrafluoroethylene (PTFE) O-rings are designed to be used in harsh environments with temperatures ranging from -450F to 600F. For more advice and information on suitable products to use as engine o-rings, feel free to contact our customer service team through the support pages on our site. Aflas materials exhibit excellent chemical, heat and steam resistance. All Rights Reserved. The more internal pressure is applied to this join, the more the o-ring is distorted inside its groove, which can improve its overall sealing force up to a point - but beyond a certain pressure, or under more dynamic workloads, this can cause failure of the seal. document.getElementById( "ak_js_2" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. An elastomer with excellent abrasion resistance and weather resistance, and good oil resistance. Some of the common types of O-ring materials include PTFE, Nitrile (Buna), Neoprene, EPDM Rubber and Fluorocarbon (Viton). Nitrile - also known as NBR - is probably the most widely used elastomer in the seal industry at the time of writing. High-durometer o-rings are better suited for higher pressures and are more resistant to extrusion. As a general rule, the lower the clearance, the higher the pressures the o-ring can tolerate before being extruded. Well respond to your request within 1 business day. If you still have questions about after reviewing this material selection guide, we encourage you to contact our team at Arizona Sealing Devices, or browse our selection of O-rings. Choosing the best product for the job depends on finding the correct size and shape for the specific role you have in mind. O-rings function on the principle that even pressure placed on the (more or less incompressible) o-ring material creates predictable deformation patterns around the perimeter of the gasket in its groove. Fluorocarbon compounds are widely used in chemical, aerospace, and industrial applications. A static O-ring is any o-ring designed to contact with two or more surfaces that do not move relative to one another, whereas a dynamic O-ring is one that helps form a seal between moving parts. NBR 70 o-rings are ideal for uses where oil resistance and low-temperature functionality are required - as such, theyre often found in military applications and automotive or aircraft fuel systems. Many basic rubbers and polymers arent suitable for use with oils, fuels or solvent-based compounds. Available in standard black. For more detail on all types of O-ring materials and designated temperature ranges, feel free to contact our expert support team any time - theyll be glad to offer further advice and assistance on specific high-temperature seals, materials and applications. The trade-off is that PTFE is difficult to install, having very limited elastic memory and poor tear resistance. Theyre used with static, dynamic, hydraulic and pneumatic components, making them an especially versatile solution to a very widespread engineering issue. Polyurethane is a type of thermoplastic elastomer that can be formulated in a variety of ways, each yielding very different mechanical properties and resistances. If high pressure is coming from one direction, a single backup ring should suffice when placed on the low-pressure side within the gland. Abrasion and tear resistance may also be of importance, especially in dynamic applications or when abrasive substances are involved. Has an operating temperature range of -75 to 450F (-60C to 232C) with a harness range of 30-80 durometer. Higher temperatures, chemical exposure and other application factors will impact need for even smaller clearence gap, increased durometer hardness or other improved material properties and groove design considerations to use backup rings or consider metal spring energized PTFE seals for use in high pressure applications. Generally Polyurethanes have excellent wear and abrasion resistance, good weathering resistance, and moderate resistance to oils and lubricants depending on formulation. However, ethylene propylene has largely supplanted butyl due to its enhanced durability. NBR O-ring seal temperature rangeWorking NBR o-ring temperature range is anywhere from about -35 c to 120 c. Like NBR, Buna-N o-rings are also nitrile products. Neoprene O-rings have a relatively low compression set, good resilience, abrasion, and are flex cracking resistant. Its other benefits include resistance to ozone and sunlight, as well as good shock-dampening capabilities. A synthetic rubber with excellent oil resistance and fair to good chemical resistance. Polyurethane should not be exposed to strong acids, bases, or brake fluids, limiting some of its potential transportation applications despite the materials capacity to carry heavy loads. To answer many of your questions about O-rings, The Hope Group has created an advanced O-ring material selection guide, where we will look at the properties and compatibility as well as the temperature range and hardness of each O-ring material. Rocket Seals distributes high pressure O-rings and high pressure hydraulic O-rings from reputable manufacturers. However, mechanical failure under high pressure can easily cause extrusion or destruction of the o-ring, which is why its important to choose the right material for the precise environment youre looking to use it in. Rocket Seals, Inc. 1297 S. Lipan St. Denver, CO 80223, Local Number: 303.777.7024 Local Number: 303.777.7024, Toll Free: 1.800.445.7803 Toll Free: 1.800.445.7803, Standard and Metric O-Ring and Splicing Kits, Vee Packing, Nylon Top & Bottom Bearings and Wiper Kits, Water Treatment, Wastewater and Filtration, Oil and Gas, Power Generation and Chemical Processing. allorings.com PO Box 1150 Seabrook, NH 03874 It has an operating temperature of -75 to 400F (-59 to 204C) and a hardness range of 50-80 durometer. A family of perfluoroelastomer compounds that provides excellent chemical, heat, oil and abrasion resistance. Because there are so many different sizes and gauges of o-ring distributed throughout most aircraft engines and systems, most sales for aerospace and aeronautics are through bulk orders of multi-size o-ring kits. Provided the internal pressure from fluids being contained stays below a given O-ring's contact stress rating, its largely impossible for leaks to occur, even under high pressure. In this guide, well look at some of the more common types of o-ring seals on the market, and discuss where and when to use them. O-rings and seals are used in a wide range of industries to help you tightly seal the connections in pipes, tubes, and other elements of complex hydraulic and pneumatic systems. They are particularly valuable in aircraft engines and automotive fuel handling systems because they resist swell in high-octane and oxygenated fuels. Additionally, you can perform appropriate field tests to ensure the fluid, temperature, pressure, and environmental conditions are compatible with the O-ring of your choice. Compared to cast polyurethane, it has a lower tensile strength and weakens at high temperatures., Kalrez features exceptional chemical resistance, and theres virtually no industrial chemical that will cause it to degrade (although Kalrez O-rings will swell in the presence of certain solvents). Although silicone is well-known for medical-grade and FDA-compliant sealing applications, silicone rubber is also a solid choice for extreme temperature static sealing due to its heat and cold resistance. Here are the materials we use most frequently: Among the most common elastomers used in O-ring manufacturing, Nitrile is a synthetic rubber unique for its chemical resistance properties. Fluorosilicone is a saturated rubber with excellent extreme-temperature stability, making it a popular material in aerospace applications. Excellent high pressure and explosive decompression resistance. There are colored and translucent materials as well as internally lubricated materials to meet special needs. If high pressure is coming from both directions, two backup rings (one on each side of the o-ring) are recommended. Marco Rubber offers a wide variety of high pressure o-ring materials for use with or without backup rings or consider metal spring energized PTFE seals for ultimate high pressure sealing performance. Request a quote for the O-ring material that meets your operating requirements or contact us for assistance. Poor resistance to aromatic or chlorinated hydrocarbons, fuels and solvents. As such, theyre considered an extreme performance o-ring sealing solution, designed to offer optimal reliability under, especially tough conditions. As an authorized Parker distributor in addition to standard O-ring materials mentioned above, The Hope Group also offers custom seals that are designed exclusively for your specific application. They offer good resistance to high temperatures (up to 210 C), but are prone to failure below -15 C in dynamic applications when they tend to become too stiff and inflexible. Checkout My Orders There are FDA, USP Class VI, Nuclear Grades and compounds that meet AMS, Mil standards as well as other specifications. A synthetic rubber material that is non-reactive, stable, and provides excellent resistance to heat, cold, UV and ozone exposure, and fungal growth. Has an operating temperature of -45 to 225F (-43 to 107C) and a durometer of 40-90 durometer. O-Rings can withstand higher pressures in static applications compared to dynamic applications. Fluorosilicones have excellent low temperature resistance and are often used in demanding aerospace and automotive applications such as fuel and exhaust systems. GLT Type FKM with wider temperature range for explosive decompression, Norsok and Nace tested. Some materials perform well in chemical or high heat applications where others may deteriorate under harsh operating conditions. HNBR compounds also have excellent abrasion, wear, and compression set resistance. As a result, our clients return to us again and again for guidance and reliable elastomer products. One of the key strengths of an O-ring-type seal is that after the parts it joins are disconnected and the compression forces acting on it are removed, it will return to its original shape. Therefore, manufacturers, including Parker, solve this problem by mixing PTFE material with various fillers to provide users with more flexibility. A synthetic rubber providing excellent chemical resistance and heat resistance. Having both thermal and chemical resistance properties, fluorosilicone is also becoming popular for general-purpose O-rings, especially for outdoor applications. Has an operating temperature range of -60 to 225F (-51 to 107C) and a hardness range of 70-90 durometer. There are numerous types of O-ring materials available and each offers different features and benefits. The only drawback to a high durometer is the decreased squeeze of the o-ring. Silicone can be formulated in a variety colors, durometer hardnesses and variations designed for use in a wide range of demanding specialty applications like medical and EMI shielding. Contact usfor more information about our O-ring materials orrequest a quoteon your custom application today.

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