O-Rings
Centro is your premier destination for top-tier industrial solutions, and our O-rings collection is a testament to our commitment to quality and performance. Explore a comprehensive array of meticulously engineered O-rings, crafted from durable materials and precision-molded for reliability in various applications. Whether you require standard sizes or bespoke configurations, Centro provides a diverse range of O-rings to meet your specific needs. Our website offers comprehensive insights into specifications, technical details, and practical applications, empowering you with the knowledge necessary to make informed decisions for your industrial sealing requirements. Count on Centro for excellence in O-Ring solutions, delivering unparalleled reliability and sealing precision for your operations.
Filter
Filter
4,166 items
content loaded
Generally, EPDM o-rings are known to possess excellent resistance to ozone, sunlight, and weathering, and has very good flexibility at low temperature, good chemical resistance (many dilute acids and alkalis as well as polar solvents), and good electrical insulation property. EPDM o-rings are useful for a number of industries from automobile assembly to water purification systems.Performs well in Alcohols, Automotive brake fluid, Ketones, Dilute acids and alkalis, Silicone oils and greases, Steam up to 204.4ºC (400ºF), Water, Phosphate ester based hydraulic fluids, Ozone, aging, and weathering.Does not perform well in Aliphatic and aromatic hydrocarbons, Di-ester based lubricants, Halogenated solvents, Petroleum based oils and greases.
$0.07
In Stock (40891)Ships within 1 business day
Nitrile rubber (NBR) o-rings, also known as Buna-N, are one of the most commonly used sealing elastomers due to resistance to petroleum-based fuels and lubricants and its relatively low price. Standard Nitrile o-rings are usually sulfur-cured. Sulfur-cured compounds offer better low-temperature properties but are more prone to hardening with high temperatures. Performs well in Petroleum-based oils and fuels, Aliphatic hydrocarbons, Vegetable oils, Silicone oils and greases, Ethylene glycol, Dilute acids.Does not perform well in Aromatic hydrocarbons, Automotive brake fluid, Chlorinated hydrocarbons, Ketones, Ethers, Esters, Phosphate ester hydraulic fluids, Strong acids, Ozone, weathering, and sunlight.
$0.05
In Stock (101241)Ships within 1 business day
Nitrile rubber (NBR) o-rings, also known as Buna-N, are one of the most commonly used sealing elastomers due to resistance to petroleum-based fuels and lubricants and its relatively low price. Standard Nitrile o-rings are usually sulfur-cured. Sulfur-cured compounds offer better low-temperature properties but are more prone to hardening with high temperatures. Performs well in Petroleum-based oils and fuels, Aliphatic hydrocarbons, Vegetable oils, Silicone oils and greases, Ethylene glycol, Dilute acids.Does not perform well in Aromatic hydrocarbons, Automotive brake fluid, Chlorinated hydrocarbons, Ketones, Ethers, Esters, Phosphate ester hydraulic fluids, Strong acids, Ozone, weathering, and sunlight.
$0.06
In Stock (29569)Ships within 1 business day
Silicone o-rings have excellent heat, ozone and corona resistance and have good dielectric stability and resistance to many oils, chemicals and solvents. Silicone o-rings maintain the best flexible property at low temperatures but have low tensile strength and low wear and tear resistance. Performs well in Engine and transmission oil (mineral oils), Diluted salt solution, Moderate water, Dry heat, Ozone and weather resistance.Does not perform well in Concentrated acids and alkalis, Steam over 120ºC (248ºF), Petroleum oils and fuels, Ketones.
$0.05
In Stock (83634)Ships within 1 business day
FKM is a well-known high-performance rubber that has excellent resistance to high temperature, ozone, weather, oxygen, mineral oil, fuels, hydraulic fluids, aromatics and many organic solvents and chemicals. Outstanding resistance to heat, oxidation, weathering, ozone; Outstanding resistance to a broad variety of fluids, including: aliphatic and aromatic hydrocarbons, halogenated fluids, strong acids; Outstanding resistance to compression set, providing sealing performance and longevity unmatched by any non-fluorinated elastomer.Performs well in Petroleum products, Fuel or blend with methanol or ethanol, Diesel or blend with biodiesel, Mineral oil and grease, Silicone oil and grease, High vacuum, Ozone, weather, and very high temperature air, Strong acid.Does not perform well in Ketones, Low molecular weight organic acids, Superheat steam, Low molecular weight esters and ethers, Phosphate ester based hydraulic fluids.
$0.08
In Stock (4821)Ships within 1 business day
FKM is a well-known high-performance rubber that has excellent resistance to high temperature, ozone, weather, oxygen, mineral oil, fuels, hydraulic fluids, aromatics and many organic solvents and chemicals. Outstanding resistance to heat, oxidation, weathering, ozone; Outstanding resistance to a broad variety of fluids, including: aliphatic and aromatic hydrocarbons, halogenated fluids, strong acids; Outstanding resistance to compression set, providing sealing performance and longevity unmatched by any non-fluorinated elastomer.Performs well in Petroleum products, Fuel or blend with methanol or ethanol, Diesel or blend with biodiesel, Mineral oil and grease, Silicone oil and grease, High vacuum, Ozone, weather, and very high temperature air, Strong acid.Does not perform well in Ketones, Low molecular weight organic acids, Superheat steam, Low molecular weight esters and ethers, Phosphate ester based hydraulic fluids.
$0.09
In Stock (17891)Ships within 1 business day
FKM is a well-known high-performance rubber that has excellent resistance to high temperature, ozone, weather, oxygen, mineral oil, fuels, hydraulic fluids, aromatics and many organic solvents and chemicals. Outstanding resistance to heat, oxidation, weathering, ozone; Outstanding resistance to a broad variety of fluids, including: aliphatic and aromatic hydrocarbons, halogenated fluids, strong acids; Outstanding resistance to compression set, providing sealing performance and longevity unmatched by any non-fluorinated elastomer.Performs well in Petroleum products, Fuel or blend with methanol or ethanol, Diesel or blend with biodiesel, Mineral oil and grease, Silicone oil and grease, High vacuum, Ozone, weather, and very high temperature air, Strong acid.Does not perform well in Ketones, Low molecular weight organic acids, Superheat steam, Low molecular weight esters and ethers, Phosphate ester based hydraulic fluids.
$0.10
In Stock (5454)Ships within 1 business day
Generally, EPDM o-rings are known to possess excellent resistance to ozone, sunlight, and weathering, and has very good flexibility at low temperature, good chemical resistance (many dilute acids and alkalis as well as polar solvents), and good electrical insulation property. EPDM o-rings are useful for a number of industries from automobile assembly to water purification systems.Performs well in Alcohols, Automotive brake fluid, Ketones, Dilute acids and alkalis, Silicone oils and greases, Steam up to 204.4ºC (400ºF), Water, Phosphate ester based hydraulic fluids, Ozone, aging, and weathering.Does not perform well in Aliphatic and aromatic hydrocarbons, Di-ester based lubricants, Halogenated solvents, Petroleum based oils and greases.
$0.07
In Stock (146)Ships within 1 business day
Neoprene is a multi-purposed elastomer which yields a balanced combination of properties. Neoprene o-rings are typically seen in the refrigeration sector, as they demonstrate remarkable resistance to chemicals such as ammonia and a variety of coolants. Neoprene o-rings also perform well in contact with oils and many chemicals and has good resistance to sun, ozone and weather. The material displays outstanding toughness and good resistance to fire.Performs well in Refrigerants, Ammonia, Water, Silicone grease and oils, High aniline point mineral oil.Does not perform well in Aromatic hydrocarbons, Ketones, Esters, Ethers, Strong oxidizing acids, Chlorinated hydrocarbons.
Requires Quote
Should ship between 27 Oct and 03 Nov
Subject to factory lead times
Nitrile rubber (NBR) o-rings, also known as Buna-N, are one of the most commonly used sealing elastomers due to resistance to petroleum-based fuels and lubricants and its relatively low price. Standard Nitrile o-rings are usually sulfur-cured. Sulfur-cured compounds offer better low-temperature properties but are more prone to hardening with high temperatures. Performs well in Petroleum-based oils and fuels, Aliphatic hydrocarbons, Vegetable oils, Silicone oils and greases, Ethylene glycol, Dilute acids.Does not perform well in Aromatic hydrocarbons, Automotive brake fluid, Chlorinated hydrocarbons, Ketones, Ethers, Esters, Phosphate ester hydraulic fluids, Strong acids, Ozone, weathering, and sunlight.
$0.04
In Stock (40529)Ships within 1 business day
Nitrile rubber (NBR) o-rings, also known as Buna-N, are one of the most commonly used sealing elastomers due to resistance to petroleum-based fuels and lubricants and its relatively low price. Standard Nitrile o-rings are usually sulfur-cured. Sulfur-cured compounds offer better low-temperature properties but are more prone to hardening with high temperatures. Performs well in Petroleum-based oils and fuels, Aliphatic hydrocarbons, Vegetable oils, Silicone oils and greases, Ethylene glycol, Dilute acids.Does not perform well in Aromatic hydrocarbons, Automotive brake fluid, Chlorinated hydrocarbons, Ketones, Ethers, Esters, Phosphate ester hydraulic fluids, Strong acids, Ozone, weathering, and sunlight.
$0.05
In Stock (8920)Ships within 1 business day
Silicone o-rings have excellent heat, ozone and corona resistance and have good dielectric stability and resistance to many oils, chemicals and solvents. Silicone o-rings maintain the best flexible property at low temperatures but have low tensile strength and low wear and tear resistance. Performs well in Engine and transmission oil (mineral oils), Diluted salt solution, Moderate water, Dry heat, Ozone and weather resistance.Does not perform well in Concentrated acids and alkalis, Steam over 120ºC (248ºF), Petroleum oils and fuels, Ketones.
$0.04
In Stock (149913)Ships within 1 business day
Generally, EPDM o-rings are known to possess excellent resistance to ozone, sunlight, and weathering, and has very good flexibility at low temperature, good chemical resistance (many dilute acids and alkalis as well as polar solvents), and good electrical insulation property. EPDM o-rings are useful for a number of industries from automobile assembly to water purification systems.Performs well in Alcohols, Automotive brake fluid, Ketones, Dilute acids and alkalis, Silicone oils and greases, Steam up to 204.4ºC (400ºF), Water, Phosphate ester based hydraulic fluids, Ozone, aging, and weathering.Does not perform well in Aliphatic and aromatic hydrocarbons, Di-ester based lubricants, Halogenated solvents, Petroleum based oils and greases.
$0.07
In Stock (40891)Ships within 1 business day
Nitrile rubber (NBR) o-rings, also known as Buna-N, are one of the most commonly used sealing elastomers due to resistance to petroleum-based fuels and lubricants and its relatively low price. Standard Nitrile o-rings are usually sulfur-cured. Sulfur-cured compounds offer better low-temperature properties but are more prone to hardening with high temperatures. Performs well in Petroleum-based oils and fuels, Aliphatic hydrocarbons, Vegetable oils, Silicone oils and greases, Ethylene glycol, Dilute acids.Does not perform well in Aromatic hydrocarbons, Automotive brake fluid, Chlorinated hydrocarbons, Ketones, Ethers, Esters, Phosphate ester hydraulic fluids, Strong acids, Ozone, weathering, and sunlight.
$0.05
In Stock (101241)Ships within 1 business day
Nitrile rubber (NBR) o-rings, also known as Buna-N, are one of the most commonly used sealing elastomers due to resistance to petroleum-based fuels and lubricants and its relatively low price. Standard Nitrile o-rings are usually sulfur-cured. Sulfur-cured compounds offer better low-temperature properties but are more prone to hardening with high temperatures. Performs well in Petroleum-based oils and fuels, Aliphatic hydrocarbons, Vegetable oils, Silicone oils and greases, Ethylene glycol, Dilute acids.Does not perform well in Aromatic hydrocarbons, Automotive brake fluid, Chlorinated hydrocarbons, Ketones, Ethers, Esters, Phosphate ester hydraulic fluids, Strong acids, Ozone, weathering, and sunlight.
$0.06
In Stock (29569)Ships within 1 business day
Silicone o-rings have excellent heat, ozone and corona resistance and have good dielectric stability and resistance to many oils, chemicals and solvents. Silicone o-rings maintain the best flexible property at low temperatures but have low tensile strength and low wear and tear resistance. Performs well in Engine and transmission oil (mineral oils), Diluted salt solution, Moderate water, Dry heat, Ozone and weather resistance.Does not perform well in Concentrated acids and alkalis, Steam over 120ºC (248ºF), Petroleum oils and fuels, Ketones.
$0.05
In Stock (83634)Ships within 1 business day
FKM is a well-known high-performance rubber that has excellent resistance to high temperature, ozone, weather, oxygen, mineral oil, fuels, hydraulic fluids, aromatics and many organic solvents and chemicals. Outstanding resistance to heat, oxidation, weathering, ozone; Outstanding resistance to a broad variety of fluids, including: aliphatic and aromatic hydrocarbons, halogenated fluids, strong acids; Outstanding resistance to compression set, providing sealing performance and longevity unmatched by any non-fluorinated elastomer.Performs well in Petroleum products, Fuel or blend with methanol or ethanol, Diesel or blend with biodiesel, Mineral oil and grease, Silicone oil and grease, High vacuum, Ozone, weather, and very high temperature air, Strong acid.Does not perform well in Ketones, Low molecular weight organic acids, Superheat steam, Low molecular weight esters and ethers, Phosphate ester based hydraulic fluids.
$0.08
In Stock (4821)Ships within 1 business day
FKM is a well-known high-performance rubber that has excellent resistance to high temperature, ozone, weather, oxygen, mineral oil, fuels, hydraulic fluids, aromatics and many organic solvents and chemicals. Outstanding resistance to heat, oxidation, weathering, ozone; Outstanding resistance to a broad variety of fluids, including: aliphatic and aromatic hydrocarbons, halogenated fluids, strong acids; Outstanding resistance to compression set, providing sealing performance and longevity unmatched by any non-fluorinated elastomer.Performs well in Petroleum products, Fuel or blend with methanol or ethanol, Diesel or blend with biodiesel, Mineral oil and grease, Silicone oil and grease, High vacuum, Ozone, weather, and very high temperature air, Strong acid.Does not perform well in Ketones, Low molecular weight organic acids, Superheat steam, Low molecular weight esters and ethers, Phosphate ester based hydraulic fluids.
$0.09
In Stock (17891)Ships within 1 business day
FKM is a well-known high-performance rubber that has excellent resistance to high temperature, ozone, weather, oxygen, mineral oil, fuels, hydraulic fluids, aromatics and many organic solvents and chemicals. Outstanding resistance to heat, oxidation, weathering, ozone; Outstanding resistance to a broad variety of fluids, including: aliphatic and aromatic hydrocarbons, halogenated fluids, strong acids; Outstanding resistance to compression set, providing sealing performance and longevity unmatched by any non-fluorinated elastomer.Performs well in Petroleum products, Fuel or blend with methanol or ethanol, Diesel or blend with biodiesel, Mineral oil and grease, Silicone oil and grease, High vacuum, Ozone, weather, and very high temperature air, Strong acid.Does not perform well in Ketones, Low molecular weight organic acids, Superheat steam, Low molecular weight esters and ethers, Phosphate ester based hydraulic fluids.
$0.10
In Stock (5454)Ships within 1 business day
Generally, EPDM o-rings are known to possess excellent resistance to ozone, sunlight, and weathering, and has very good flexibility at low temperature, good chemical resistance (many dilute acids and alkalis as well as polar solvents), and good electrical insulation property. EPDM o-rings are useful for a number of industries from automobile assembly to water purification systems.Performs well in Alcohols, Automotive brake fluid, Ketones, Dilute acids and alkalis, Silicone oils and greases, Steam up to 204.4ºC (400ºF), Water, Phosphate ester based hydraulic fluids, Ozone, aging, and weathering.Does not perform well in Aliphatic and aromatic hydrocarbons, Di-ester based lubricants, Halogenated solvents, Petroleum based oils and greases.
$0.07
In Stock (146)Ships within 1 business day
Neoprene is a multi-purposed elastomer which yields a balanced combination of properties. Neoprene o-rings are typically seen in the refrigeration sector, as they demonstrate remarkable resistance to chemicals such as ammonia and a variety of coolants. Neoprene o-rings also perform well in contact with oils and many chemicals and has good resistance to sun, ozone and weather. The material displays outstanding toughness and good resistance to fire.Performs well in Refrigerants, Ammonia, Water, Silicone grease and oils, High aniline point mineral oil.Does not perform well in Aromatic hydrocarbons, Ketones, Esters, Ethers, Strong oxidizing acids, Chlorinated hydrocarbons.
Requires Quote
Should ship between 27 Oct and 03 Nov
Subject to factory lead times
Nitrile rubber (NBR) o-rings, also known as Buna-N, are one of the most commonly used sealing elastomers due to resistance to petroleum-based fuels and lubricants and its relatively low price. Standard Nitrile o-rings are usually sulfur-cured. Sulfur-cured compounds offer better low-temperature properties but are more prone to hardening with high temperatures. Performs well in Petroleum-based oils and fuels, Aliphatic hydrocarbons, Vegetable oils, Silicone oils and greases, Ethylene glycol, Dilute acids.Does not perform well in Aromatic hydrocarbons, Automotive brake fluid, Chlorinated hydrocarbons, Ketones, Ethers, Esters, Phosphate ester hydraulic fluids, Strong acids, Ozone, weathering, and sunlight.
$0.04
In Stock (40529)Ships within 1 business day
Nitrile rubber (NBR) o-rings, also known as Buna-N, are one of the most commonly used sealing elastomers due to resistance to petroleum-based fuels and lubricants and its relatively low price. Standard Nitrile o-rings are usually sulfur-cured. Sulfur-cured compounds offer better low-temperature properties but are more prone to hardening with high temperatures. Performs well in Petroleum-based oils and fuels, Aliphatic hydrocarbons, Vegetable oils, Silicone oils and greases, Ethylene glycol, Dilute acids.Does not perform well in Aromatic hydrocarbons, Automotive brake fluid, Chlorinated hydrocarbons, Ketones, Ethers, Esters, Phosphate ester hydraulic fluids, Strong acids, Ozone, weathering, and sunlight.
$0.05
In Stock (8920)Ships within 1 business day
Silicone o-rings have excellent heat, ozone and corona resistance and have good dielectric stability and resistance to many oils, chemicals and solvents. Silicone o-rings maintain the best flexible property at low temperatures but have low tensile strength and low wear and tear resistance. Performs well in Engine and transmission oil (mineral oils), Diluted salt solution, Moderate water, Dry heat, Ozone and weather resistance.Does not perform well in Concentrated acids and alkalis, Steam over 120ºC (248ºF), Petroleum oils and fuels, Ketones.
$0.04
In Stock (149913)Ships within 1 business day
FAQS
- Both materials handle elevated temperatures well, but they perform differently depending on what else the application demands. Silicone (VMQ) has a broader thermal range in terms of low-temperature flexibility, remaining pliable down to around -65°F and serviceable up to approximately 400°F in static applications. It is exceptionally stable across a wide temperature swing and resists compression set at high temperatures better than most elastomers. Viton (FKM) has a slightly narrower range — roughly -15°F to 400°F in standard grades, with high-performance FKM compounds reaching 450°F — but it significantly outperforms silicone in chemical resistance. Silicone has poor resistance to fuels, oils, and most hydrocarbons, making it unsuitable for anything beyond dry heat, steam, or food-contact applications. Viton maintains its integrity in fuel, oil, acid, and solvent environments at high temperatures where silicone would rapidly swell and fail. The practical conclusion: if the application is purely thermal with no chemical exposure, silicone is an excellent and cost-effective choice. If heat is combined with chemical exposure, Viton is almost always the better option.
- PTFE is chemically unmatched, but it comes with significant mechanical limitations that make it unsuitable for many standard O-ring applications. It has no elastic memory — unlike rubber-based elastomers, PTFE does not spring back after compression, meaning it cannot maintain a reliable seal under dynamic conditions or where the groove dimensions fluctuate due to thermal cycling or pressure variation. This makes PTFE O-rings appropriate only for static sealing applications where the seal is compressed once and remains undisturbed. Cold flow, also called creep, is a persistent problem — under sustained compressive load, PTFE gradually deforms and flows out of the groove over time, causing the sealing force to relax and the seal to leak. It also has poor resistance to abrasion in sliding or reciprocating applications. PTFE O-rings cannot be used as drop-in replacements for elastomeric O-rings in dynamic seals such as hydraulic cylinder rods, rotating shafts, or valve stems without design modifications. They are best suited for chemical containment flanges, static instrumentation connections, and applications where no other material is chemically compatible — with the understanding that hardware design must compensate for the material's lack of resilience.
- Nitrile (Buna-N, NBR) operates reliably from about -40°F to 250°F in standard formulations, with low-temperature grades pushing the lower limit to around -65°F. It is the most widely used general-purpose O-ring material because it combines a reasonable temperature range with excellent resistance to petroleum oils, hydraulic fluids, and fuels. EPDM has a broader and more balanced thermal range, typically rated from -65°F to 300°F, and some compounds extend usability to 350°F in static service. EPDM also maintains flexibility at low temperatures better than standard Nitrile. However, the temperature ranges alone do not tell the full story. Nitrile fails rapidly in steam, ozone, ketones, and polar solvents regardless of temperature, while EPDM handles all of these well but is completely incompatible with petroleum oils and fuels — even brief exposure will cause severe swelling and degradation. Choosing between them therefore depends on the fluid first and temperature second, not the other way around.
- Gasoline is a hydrocarbon mixture that is moderately aggressive toward elastomers, and the growing use of ethanol-blended fuels has made material selection more demanding than it used to be. Viton (FKM) is the top choice for gasoline and ethanol-blended fuels — it offers excellent resistance to aromatic and aliphatic hydrocarbons, resists swelling in E10 and E85 blends, and maintains its integrity at elevated temperatures in fuel systems. Nitrile (Buna-N) is the traditional standard for petroleum fuel service and remains acceptable for straight gasoline in lower-temperature, lower-pressure applications, but it performs poorly in high-ethanol blends, showing significant swell and deterioration. Fluorosilicone (FVMQ) is a good option when the application also requires low-temperature flexibility alongside fuel resistance, as standard Viton becomes stiff at temperatures below -15°F. EPDM, silicone, and Neoprene should be avoided entirely — all three exhibit severe swell or chemical degradation in gasoline. For modern fuel systems where ethanol content varies or is high, Viton or fluorosilicone are the only reliable long-term choices.
- For water service, EPDM is generally the preferred choice, but the answer depends on what type of water system and what else the fluid or environment contains. EPDM has excellent resistance to water, steam, hot water, and water treatment chemicals including chlorine and chloramines used in municipal water systems. It is widely specified for potable water applications, plumbing, HVAC hydronic systems, and irrigation, and many EPDM compounds carry NSF 61 certification for drinking water contact. Buna-N also handles water adequately at ambient and moderate temperatures, but it degrades in hot water above roughly 150°F, has poor resistance to ozone and UV exposure in outdoor water systems, and performs poorly in contact with chlorinated water over time. Where Buna-N has the advantage is in mixed-service systems where the water lines also carry incidental oil or fuel contamination — EPDM would swell and fail in that scenario while Buna-N would not. For clean water, steam, or chemically treated water systems, EPDM is the stronger and more durable choice. For water systems in industrial environments where oil exposure is possible, Buna-N is safer.