Purchasing Parker O-Rings may be overwhelming if you don’t know what to look for. Luckily, the company has some tools and key characteristics to make the decision a lot easier. These tools will help you determine which o-ring will best meet your needs and budget. Listed below are some tips for making the right decision. Parker o-rings are a great option for your automotive needs.
Polyurethane
Polyurethane o-rings are made from an organic thermoplastic elastomer, making them ideal for applications requiring excellent wear resistance and impact strength. These gaskets are highly resistant to high-impact loads and are suitable for drive belt applications. Polyurethane is a widely used compound in various industries due to its excellent strength, elasticity, and tear resistance. ETS is a leading polyurethane o-ring supplier.
Thousands of O-Rings are available from Sealing Devices. Sealing Devices’ application engineers will help you select the right one for your application. The company is an Authorized Distributor of Parker O-Rings, which have outstanding performance characteristics and are capable of withstanding aggressive chemistry and higher temperatures. Therefore, you can trust the company’s quality. Besides its vast selection, you can also get expert application advice from the application engineers.
The two main types of polyurethane O-Rings are General Purpose EU polyurethane (GPEU), and Viton(r) rubber. General Purpose EU polyurethane rubber is an excellent material for o-rings, as it offers high tensile strength and is resistant to abrasion and corrosion. General Purpose EU polyurethane is moderately priced and is generally limited to industrial applications that need its physical properties. Common end-use applications for Polyurethane include pneumatics and industrial seals.
Aside from its high-temperature properties, Parker O-Rings are also suitable for high-temperature applications. Because they can be installed with a narrow groove, the Parker Pradifa Ultrathan(r) o-rings require less space for installation. In addition, their low thermal expansion coefficients and compression set make them highly versatile, making them suitable for applications in which mechanical resistance is essential.
Nitrile
Nitrile Parker O-Rings are popular for sealing applications. This elastomer, also known as Buna-N, is a copolymer of butadiene and acrylonitrile. Its properties are excellent for sealing applications, and there are also high-visibility o-rings for those applications where a metal detectable seal is needed. Nitrile o-rings with a high-visibility feature keep the properties of their original compound but have a distinguishable neon green hue.
Nitrile Parker O-Rings are also NORSOK-compliant, which means they are rated to perform better than standard materials. Nitrile Parker O-Rings have a 70-durometer hardness, while their higher-durometer counterparts are rated to 90-durometer. In addition to their superior hardness, Nitrile Parker O-Rings are highly resistant to oxygenated solvents, water, and mild acids. They are also resistant to sunlight and ozone. But experts don’t recommend using Nitrile Parker O-Rings in environments that contain hydrocarbons or gasoline.
The N0674 nitrile O-ring is a 70-durometer general-purpose nitrile O-ring that is UL-listed and certified to Mil-G-21569. As a general-purpose nitrile O-Ring, it offers the perfect balance of properties. Nitriles are unsuitable for exposure to ozone, sunlight, or weathering, and they are not rated for high-temperature applications.
Nitrile compound formulations
The properties of nitrile compound formulations for Parker O-Rinds depend on the percentage of acrylonitrile in the base polymer. Hydrogenated versions of nitrile offer enhanced strength at higher temperatures. The exact formulations and chemical resistance vary depending on their use and application. Parker Seals and many other world-class manufacturers offer nitrile compounds for o-rings.
In addition to their chemical and thermal resistance, nitrile compounds provide excellent oil and fuel resistance. Despite their excellent physical properties, nitrile compounds are susceptible to weather and ozone. Experts don’t recommend using them near ozone-generating equipment or electric motors. Nitrile compounds are also susceptible to chemical and mechanical deterioration. However, the benefits outweigh the drawbacks.
One such material is Parker V1238-95, a 95 Shore-A fluorocarbon. This material is certified NSF 61 and meets the requirements for use in the United Kingdom, Germany, and North America. NSF International was established in 1944 and is recognized by the American National Standards Institute. This organization develops qualification criteria for potable water components and delivery systems. A complete listing of these compounds is available on the company’s website.
Among the most commonly used compounds for Parker O-Rings are nitrile (nitrile) and nitrile (NBR). These compounds meet nearly every specification, including AN, M, MS, and NAS. These compounds are the most cost-effective solution for many different applications. If you’re not sure which compound is best for your particular application, you can choose to consult with a Parker representative.
Nitrile compound
The majority of Parker O-Rings are Nitrite compounds, but this material is not suitable for every application. Its high resistance to both heat and oxygenated solvents, as well as water and mild acids, makes it an excellent choice for many applications. However, it is not suitable for applications involving gasoline or hydrocarbon environments. That’s why many engineers recommend using a different compound for a particular application.
A nitrile compound is a synthetic rubber. It is resistant to oil, fuel, and mineral and vegetable oils. It is also resistant to diluted acids and alkalis. Nitrile o-rings are often used in automotive applications, but it is also an excellent choice for aerospace applications. The high tensile strength of a nitrile compound, combined with its high elongation at break, makes it an excellent choice for these types of applications.
NBR is a type of synthetic rubber made from butadiene and acrylonitrile. It varies in content from 18% to 50%. The higher the content, the better it is for sealing and preventing leaks, but a higher concentration may adversely affect the elasticity and compression set of the o-ring. Most manufacturers of nitrile-based seals choose NBR for their general-purpose applications.
The main benefits of nitrile-based rubber are excellent heat, oil, and chemical resistance, and good insulating and mechanical properties. Its operating temperature range is -40 degrees Fahrenheit to 250 degrees Celsius and it has a durometer of 50-90. It is used extensively in automotive and chemical applications. O-rings made of this material can be custom-colored to match the OEM’s requirements.
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Polyurethane compound formulations
Polyurethane O-rings from Parker Seals are a polymer derived from the reaction between diisocyanate and polyol. The resulting compounds exhibit superior strength and excellent tear and permeation resistance. Parker seals offer O-rings in standard and custom sizes. Resilon polyurethane is a proprietary formulation in the Resilon family. It offers the high-strength properties of polyurethane with the flexibility of a nitrile polymer. Its Resilon O-rings provide durable and cost-effective sealing, reducing downtime.
EPR O-Rings from Parker Seals and other leading manufacturers have excellent chemical, thermal, and oil resistance. The chemical composition is similar to that of PTFE and NBR rubber, and it is suitable for applications requiring excellent corrosion, heat, oil, and chemical resistance. EPDM O-Rings come in standard black and 70 durometer but can be customized for specific applications.
Neoprene is a general-purpose elastomer with good abrasion and flex crack resistance. Fluorocarbon O-rings, also known as Viton, offer excellent chemical and high-temperature resistance. For this reason, they’re often used in automotive and aerospace applications. Some forms of FKM O-rings are suitable for operating at -65°F and 450°F, depending on their application.
Critical medical seals require higher quality materials. For example, compounds made of ingredients approved by the Food and Drug Administration (FDA) must be safe for use in food or medical devices. According to the U.S. Pharmacopeia Class VI, compound formulations must meet strict requirements for the system and intracutaneous toxicity. Similarly, materials approved by the United States Department of Agriculture (USDA) must meet similar standards. Moreover, manufacturers of seals must comply with additional requirements. Parker has developed polyurethane compound formulations that meet all the necessary standards.
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