Apr. 17, 2023
In this section, we’ll look a little more closely at what o-rings do, and some of the applications that they’re very often used for.
High-temperature sealing o-rings are, as the name implies, designed to withstand extreme heat while continuing to provide a reliable seal between two surfaces or components.
This makes them ideal for demanding industries and environments such as oil and gas refineries, chemical processing, or any other scenario where a high-temperature seal is required, such as performance transport applications like turbo engines and aerospace engineering.
There are a number of popular high-temperature o-ring material choices, including nitrile, hydrogenated nitrile, silicone rubber, polyacrylate and more. 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.
For more detail on all types of O-ring materials and designated temperature ranges, feel free to contact our expert support team any time - they’ll be glad to offer further advice and assistance on specific high-temperature seals, materials and applications.
Again, all industrial o-ring purchases should be carefully planned with direct reference to the specific role and environment the seal is required to perform in. 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:
Nitrile: anywhere from -50 C to 120 C
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. 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.
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. This means there’s a fairly uniform mechanical stress placed on all contacting surfaces of an o-ring.
Provided the internal pressure from fluids being contained stays below a given O-ring's contact stress rating, it’s largely impossible for leaks to occur, even under high pressure. However, mechanical failure under high pressure can easily cause extrusion or destruction of the o-ring, which is why it’s important to choose the right material for the precise environment you’re looking to use it in.
An engine o-ring, especially one used in high performance or turbo engines, is a good example of a product that has to be rugged enough in design and material construction to handle various challenging requirements of temperature, pressure and chemical compatibility.
Many basic rubbers and polymers aren’t suitable for use with oils, fuels or solvent-based compounds. 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.
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.
Plumbing o-ring choices are widespread, given the range of materials, sizes and gauges available for use in ducting and pipework applications, as well as to form tight waterproof seals around taps and other fittings. Choosing the best product for the job depends on finding the correct size and shape for the specific role you have in mind.
Food-grade o-rings have been manufactured to more exacting standards of material composition, such that they’ve been officially declared ‘food safe’ for use in the production and preparation of meals, beverages and dining products.
An approved food-grade o-ring must only consist of the material(s) declared and approved as food safety compliant in the country of manufacture/sale. In the UK, this applies to natural and synthetic rubbers, elastomers and polymers.
To achieve food grade approval, an o-ring manufacturer must also take into account extractable ingredients/compounds if the seal is to be used in direct contact with aqueous, acidic or fatty foods and drinks. Some common food-safe o-ring materials include EPDM, fluorocarbon, nitrile, neoprene and silicone.
Carbon dioxide often presents an issue for many types of o-rings, as softer materials have a tendency to absorb the gas over time and swell up. This can lead to an unreliable seal in the short term, and over time the CO2 will actually cause the o-ring to start to break down from within.
Some popular choices for use in applications where the o-ring will have extended CO2 contact include polyurethane, PTFE, nitrile, and fluoroelastomers. However, the best choice will always depend on the consideration of other environmental or application factors.
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 craft’s powertrain running cleanly, efficiently and smoothly. Typical applications include fuel cap gaskets, fuel system o-rings, and valve cover seals.
Common elastomers for use in aerospace-type applications include nitriles, ethylene-propylene, fluorosilicones and more. 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.
O-rings and gaskets are commonly used to create a sealed mating surface between two or more components. They are found in everything from machines and motors to plumbing fixtures and gas pipelines.
When multiple components are joined together, an O-ring or gasket may be installed at the area where they meet. Once installed, the respective component will seal the components so that they don’t leak. While both O-rings and gaskets offer a sealed mating surface, though, they aren’t necessarily the same.
Also known as a packing joint, an O-ring is a type of mechanical seal consisting of a circular-shaped piece of elastomer material. They are designed to create a sealed mating surface that’s resistant to pressure. Some O-rings, in fact, can withstand pressure in excess of 5,000 pounds per square inch (PSI). Even when exposed to severe pressure, O-rings will maintain their integrity while preventing liquids, gas or air from escaping the respective components with which they are used.
Although they are available in a variety of sizes, all O-rings have the same shape. They consist of a looped piece of elastomer material with a hollow center. This circular shape allows O-rings to fit over cylindrical-shaped components, such as pipes and hoses.
A gasket is a mechanical seal consisting of a flat piece of material. By definition, an O-ring is technically a gasket, but not all gaskets are O-rings. O-rings are made exclusively of an elastomer material, resulting in an elastic texture that’s able to stretch and revert back to its natural shape and size without breaking. Gaskets, on the other hand, can be made of any material. Some gaskets are made of an elastomer material. Others, however, are made of harder materials, such as metal. Most automotive engines, for instance, have a head metal gasket that sits between the cylinder head and the engine block.
Gaskets also come in different shapes. O-rings, on the other hand, only come in a circular shape. Many gaskets are designed in a custom shape to fit complex mating surfaces. If a mating surface has four or more components, it may require a custom-shaped gasket rather than a simple O-ring.
Gaskets and O-rings are both used to create a sealed mating surface between two or more components. O-rings are simply circular-shaped gaskets consisting of an elastomer material, whereas gaskets are flat seals consisting of any material or shape.
Oil seals, often called a rotary shaft seal or grease seal, closes the gap between stationary and moving components in mechanical equipment — most often rotating shafts — helping prevent lubricant escape and stopping harmful materials, such as dirt, from moving in through the clearance. Oil seals are most commonly used in gearboxes, hydraulic cylinders, and related components.
SHOP FOR OIL SEALS
Global O-Ring and Seal’s oil seal part numbers are designed to describe the seal size, style, and material composition. When searching for oil seals via our online store, you will not only be presented with your selection but with comparable oil seals of the same dimensions. There are often viable style substitutions which are functionally compatible, but with additional features. With over 17,000 unique oil seals in our database, you can cross-reference 180,000 part numbers of OEMs and manufacturers. In the Search Bar above, simply type the OEM/manufacturer part number alone (no need to type the name), and the oil seals matching that part number will be displayed.
As an example, this oil seal has a Shaft Size of 4″, a Bore Size of 5.000″, a Width Size of .375″, a Style of TB2, and is made of Viton material. Conversely, the same size oil seal in Metric has a Shaft Size of 101.6 mm, a Bore Size of 127 mm, and a Width Size of 9.52 mm.
OS/MOS: Designates if dimensions are displayed in inches or millimeters.
Shaft, Bore, Width: Dimensions displayed are actual size, rather than nominal.
Style: 2-5 characters in length (see our style chart at the bottom for details).
Material: There are several material options. Nitrile (Blank) Viton (V), Silicone (S), EPDM (E), Carboxylated Nitrile (X), HNBR (H), Polyacrylate (P), and Teflon (T).
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FOUNDED IN 1993
China SBT Oil Seal is an international company integrating design, research and development, production and processing.
No. 68, Hua'an Street, Renze District, Xingtai City, Hebei Province, China
+86 188 0309 4557
Won many honorary certificates through a number of patented inventions
