O-Ring Compound Guide: Materials, Temperature Ratings, Shelf Life and Certifications

What Is Durometer and Why Does It Matter?

Durometer is the hardness of the rubber, measured on the Shore A scale. A 70 durometer O-Ring is the industry standard and works for most applications. Softer O-Rings (30 to 50 duro) need less force to seal and conform better to rough or uneven surfaces, which makes them a good fit for low pressure static seals and gaskets. Harder O-Rings (80 to 95 duro) resist extrusion under high pressure and hold up better in dynamic service where the seal is moving. As a rule of thumb: under 1,500 PSI, 70 duro is the safe default. Above 1,500 PSI, step up to 90 duro or add a backup ring.

How O-Ring Shelf Life Works (SAE ARP5316)

O-Ring shelf life is governed by SAE ARP5316 (now AS5316), the aerospace standard that replaced the old MIL-HDBK-695 and MIL-STD-1523A. Shelf life is tracked in calendar quarters from the cure date, marked like "2Q26" for the second quarter of 2026. The clock starts at the end of the cure quarter.

The shelf life ratings are simple. Materials that oxidize over time get a limit. Materials that are chemically stable in air get an unlimited rating:

• 5 years: Polyurethane (AU/EU Millable gum urethanes). Rated 5 years per ARP5316. When storage conditions have been kept right, urethane O-Rings that pass a visual inspection (no cracking, hardening, tackiness, or distortion).
• 5/10 years: Cast Polyurethane (AU/EU, Cast Disogrin urethanes). Rated 5 years per ARP5316. When storage conditions have been kept right, urethane O-Rings that pass a visual inspection (no cracking, hardening, tackiness, or distortion) are good for up to 10 years.
• 15 years: Buna-N Nitrile (NBR), HNBR, Neoprene (CR), Butyl (IIR)
• Unlimited: EPDM, Viton®/FKM, Viton® ETP, FFKM, Silicone (VMQ), Fluorosilicone (FVMQ), Aflas® (FEPM), PTFE

Those ratings assume proper storage: below 100°F (38°C), out of direct sunlight and UV light, away from ozone sources like electric motors, under 75% relative humidity (under 65% for urethanes), and stored without stretch or tension. An O-Ring hanging on a hook in a hot shop ages a lot faster than one sealed in a bag in a drawer. Every O-Ring we ship is batch traceable with a cure date under our ISO 9001:2015 quality system, so you always know exactly how old your seals are.

Buna-N Nitrile O-Rings (NBR)

What it is and where to use it: Buna-N, also called Nitrile or NBR, is the most widely used O-Ring material in the world. It is the default choice for petroleum oils, hydraulic fluids, fuels, LP gas, natural gas, propane, cold water, silicone greases, and ethylene glycol fluids. You will find it in air tools, hydraulic cylinders, pumps, engines, and just about every piece of equipment that touches oil. It seals well in both static and dynamic applications and gives you the best performance for the dollar of any elastomer.

Avoid: Sunlight, UV, ozone, and outdoor weathering. Also avoid glycol brake fluids, ketones like acetone and MEK, strong acids, and chlorinated solvents.

Temperature rating: -40°F to +250°F (-40°C to +121°C). Low temp compounds (B70-LT) extend cold service.

Shelf life: 15 years per SAE ARP5316 with proper storage.

Durometers and certifications we offer:

• B70 - Standard 70 duro black, our highest inventory compound. Compares to Parker N1470-70 and N0674-70, Parco 4200-70 and 4900-70. Shop AS568 | Shop Metric
• B90 - 90 duro extra hard for high pressure service. Shop AS568 | Shop Metric
• B50 - 50 duro extra soft for low pressure and uneven surfaces. Shop AS568
• B30, B40, B60, B80 - Full durometer spread, 30 through 80, special order.
• FDAB70 - FDA compliant 70 duro black for food contact.
• WN70 - FDA compliant 70 duro white for food and beverage where visual inspection matters. Shop AS568
• B70-NSF - FDA and NSF-61 certified for drinking water systems. Shop AS568
• Metal Detectable FDA Buna-N 70 Duro (Blue) - For food and pharma lines with metal detection or X-ray inspection. Shop AS568
• B70-MS - Mil-Spec low temp black. Shop AS568
• B70-25732 - Aerospace AMS-P-25732.
• B75-83461 - AMS-R-83461, 75 duro.
• B75-5510 - AMS-P-5510.
• B70-UL - UL Listed 70 duro.
• B70-PC - Peroxide cured 70 duro for improved compression set.
• B70-IL - PTFE internally lubricated 70 duro for reduced friction on assembly.
• B70-LT - Low temperature 70 duro.
• B70-C - Standard 70 duro in colors.

HNBR O-Rings - Highly Saturated Nitrile (HSN)

What it is and where to use it: HNBR is Buna-N that has been hydrogenated, which gives it better heat resistance, better ozone and sunlight resistance, and stronger physical properties than standard nitrile. It fills the gap between NBR and Viton® when you need high tensile strength at higher temperatures. HNBR is the go-to for automotive air conditioning systems because it handles R134a refrigerant, and it holds up well against motor oil, ATF, sour gas, amine and oil mixtures, and oxidized fuels. Green HNBR is the standard color for A/C service so techs can identify it on sight.

Avoid: Ketones, esters, chlorinated hydrocarbons, and strong oxidizing acids.

Temperature rating: -40°F to +300°F (-40°C to +149°C).

Shelf life: 15 years per SAE ARP5316 with proper storage.

Durometers and certifications we offer:

• H70 Green - 70 duro green, the refrigerant service standard. Shop AS568 | Shop Metric
• H70 Black - 70 duro black. Shop AS568
• H80 - 80 duro black.
• H90 - 90 duro black for high pressure oil field and hydraulic service. Shop AS568

EPDM O-Rings (Ethylene Propylene Diene Monomer)

What it is and where to use it: EPDM is the water and weather champion. It has outstanding resistance to hot and cold water, steam up to 400°F (204°C), glycol based brake fluids, phosphate-ester hydraulic fluids (HFD-R, Skydrol type), ozone, sunlight, and aging. It also handles many acids, alkalis, cleaning agents, and polar solvents like alcohols and ketones. Use it in plumbing, municipal water systems, household appliances, food and beverage processing, brake systems, and any outdoor application. One important note: never use petroleum grease on EPDM. Use only silicone based O-Ring lubricant.

Avoid: Mineral oils, petroleum greases and fuels, gasoline, LPG, aromatic hydrocarbons, and solvents. Petroleum products will swell and destroy EPDM.

Temperature rating: -65°F to +300°F (-54°C to +149°C).

Shelf life: Unlimited per SAE ARP5316 with proper storage.

Durometers and certifications we offer:

• E70 - FDA compliant 70 duro, sulfur cured, strong abrasion resistance. Shop AS568 | Shop Metric
• E70-NSF - Peroxide cured 70 duro with FDA and NSF-61 certification, chloramine resistant, for potable water. Peroxide curing improves heat resistance and compression set versus sulfur cure. Shop AS568
• WE70-USP - Off-white 70 duro certified to USP Class VI, 3-A Dairy, USDA, and FDA for pharmaceutical and dairy service.
• E70-E454 - Simrit E454, National Aerospace Standard peroxide cured EPDM, 80 duro, for phosphate-ester aerospace hydraulic fluids. Shop AS568
• Metal Detectable FDA EPDM 70 Duro (Blue) - For food lines with metal detection. Shop AS568
• E50, E60, E80 - Sulfur cured FDA EPDM in 50, 60, and 80 duro, special order.

Viton® / FKM Fluorocarbon O-Rings

What it is and where to use it: Viton® (the DuPont/Chemours brand name for FKM fluorocarbon rubber) is the workhorse for high heat and chemical service. It has exceptional resistance to petroleum oils, fuels, gasoline, diesel, LPG, natural gas, aromatic hydrocarbons like benzene and toluene, chlorinated solvents, silicone oils, mineral and vegetable oils, chlorine water, ozone, and weathering. It also has low compression set, low gas permeability, and excellent aging, which makes it a top pick for high vacuum work. You will find FKM in aircraft engines, automotive fuel systems, and chemical processing everywhere.

Avoid: Ketones (MEK, acetone), hot water and steam, glycol brake fluid, alkalis, amines, ammonia gas, Skydrol 500, and low molecular weight organic acids like formic and acetic acid.

Temperature rating: -20°F to +400°F (-29°C to +204°C). GFLT grades extend low temperature service.

Shelf life: Unlimited per SAE ARP5316 with proper storage.

Durometers and certifications we offer: Our stock compounds are designed to meet or exceed popular FKM compounds including Parker V747-75 and V700-75, 19357, V14-75, 9009-75, F13664, 514AD, and 9500-75.

• V75 - Chemical resistant black 75 duro, our stock FKM standard. Shop AS568 | Shop Metric
• BV75 - Brown 75 duro. Shop AS568
• GV75 - Dark green 75 duro. Shop AS568
• V90 - Black 90 duro for high pressure. Shop AS568 | Shop Metric
• V50 - Soft 50 duro. Shop AS568
• V60, BV60 - Soft 60 duro in black and brown, special order.
• V95-RGD - 95 duro rapid gas decompression resistant for oil and gas service.
• FDABV75 - Brown 75 duro, FDA and 3-A certified for food contact. Shop AS568
• FDARV - Red 75 duro, FDA and 3-A certified.
• Metal Detectable FDA FKM 75 Duro (Blue) - For food lines with metal detection. Shop AS568
• V75-MS - Mil-Spec 75 duro, AS3209 M83248/1 AMS7276, QPL Listed. Shop AS568
• V75-UL - UL approved for fuel and alcohol service.
• V75-GFLT - Viton® GFLT low temperature grade, 75 duro. Shop AS568
• V75-GLT - GLT based M83485/1 (AMS-R-83485) low temperature grade. Shop AS568

Viton® Extreme ETP O-Rings

What it is and where to use it: Viton® Extreme ETP is a premium peroxide cured fluoroelastomer with the broadest fluid resistance of any FKM. It handles the things that kill standard Viton®: strong bases, organic amines, high pH fluids, and polar fluids, on top of everything standard FKM already resists (aliphatic and aromatic hydrocarbons, hydraulic fluids, fuels, and alcohols). For applications below 400°F (204°C), ETP is often a cost-effective alternative to FFKM perfluoroelastomers like Kalrez®, Chemraz®, Isolast®, and Parofluor®. It is also a wear resistant substitute for fluorosilicone in dynamic seals, and it handles high alcohol content fuels that standard FKM cannot.

Temperature rating: -8°F to +482°F (-22°C to +250°C).

Shelf life: Unlimited per SAE ARP5316 with proper storage.

Durometers and certifications we offer:

• CV75 - Viton® Extreme ETP 75 duro. Shop AS568 | Shop Metric
• CV90 - Viton® Extreme ETP 90 duro for high pressure chemical service, special order.

Silicone O-Rings (VMQ)

What it is and where to use it: Silicone is the extreme temperature specialist for static seals. It stays flexible in deep cold and holds up in high heat, with the widest usable range of the common elastomers. Silicone compounds are very clean and do not impart odor or taste, which makes them the standard for food, beverage, medical, and pharmaceutical applications. Nearly our entire silicone line is FDA compliant. Silicone also resists ozone, UV, dry heat, and weathering. One caution: silicone has low tear strength, so keep it in static applications and out of dynamic (moving) seals.

Avoid: Petroleum oils and fuels, concentrated acids and alkalis, most solvents, and prolonged steam above 250°F (121°C). Not for dynamic sealing.

Temperature rating: -75°F to +400°F (-59°C to +204°C) for standard compounds. Special phenyl silicones run down to -148°F (-100°C).

Shelf life: Unlimited per SAE ARP5316 with proper storage.

Durometers and certifications we offer:

• S70 - FDA silicone 70 duro (rust red). Shop AS568 | Shop Metric
• S70 White - FDA silicone 70 duro white.
• S70 3-A - FDA compliant and 3-A certified 70 duro for dairy service.
• S50 - FDA silicone 50 duro brick red. Shop AS568
• S50 USP - FDA and USP Class VI certified 50 duro for medical and pharmaceutical.
• S30, S40, S60, S80 - FDA silicone across the durometer range, special order.
• Metal Detectable FDA Silicone 70 Duro (Red) - For food lines with metal detection. Shop AS568
• S40-MS, S50-MS, S60-MS, S70-MS, S80-MS - Mil-Spec silicone in 40 through 80 duro.
• S70-AMS7267 - Aerospace AMS 7267 certified 70 duro.

Fluorosilicone O-Rings (FVMQ)

What it is and where to use it: Fluorosilicone combines the wide temperature stability of silicone with the fuel, oil, and solvent resistance of a fluorocarbon. That combination is unmatched for aerospace fuel systems and automotive fuel emission controls, and FVMQ compounds are built to meet or exceed government, military, aerospace, automotive, and industrial specs. Like silicone, it has low tear strength and limited abrasion resistance, so keep it in static applications.

Avoid: Brake fluids, hydrazine, ketones, and dynamic (moving) seal applications.

Temperature rating: -76°F to +392°F (-60°C to +200°C).

Shelf life: Unlimited per SAE ARP5316 with proper storage.

Durometers and certifications we offer: Our fluorosilicone line is blue and carries full military and aerospace qualifications:

• FS70 - 70 duro, M25988/1, AMS 25988 Class 1. Shop AS568
• FS75 - 75 duro. Shop AS568
• FS75 AMS 7273 - 75 duro, M25988/2, AMS 7273 certified. Shop AS568
• FS60 - 60 duro, M25988/3, AMS 25988 Class 1, special order.
• FS80 - 80 duro, M25988/4, AMS 25988 Class 1, special order.

Neoprene O-Rings (CR, Chloroprene)

What it is and where to use it: Neoprene is the preferred seal material for the refrigeration industry because of its resistance to ammonia and Freon® refrigerants (R12, R13, R21, R22, R113, R114, R115, R134A). It is reasonably priced with good resistance to moderate petroleum oils, ozone, sunlight, and oxygen aging, plus relatively low compression set, good resilience, and outstanding physical toughness. It also handles silicone oils, water, vegetable oils, alcohols, and low pressure oxygen.

Avoid: Mineral oils (very low resistance), ketones, chlorinated hydrocarbons, esters, and strong oxidizing acids.

Temperature rating: -40°F to +225°F (-40°C to +107°C).

Shelf life: 15 years per SAE ARP5316 with proper storage.

Durometers and certifications we offer:

• C70 - Neoprene black 70 duro. Shop AS568
• C50, C60, C80 - 50, 60, and 80 duro black, special order.

Aflas® O-Rings (FEPM, TFE/P)

What it is and where to use it: Aflas® is a copolymer of tetrafluoroethylene and propylene with excellent resistance across a wide range of aggressive media. It is famous in oil field service because it handles the combination that beats most other elastomers: sour oil and gas (H2S), amine corrosion inhibitors, steam, and high heat all at once. It is recommended for oils and lubricants, hydraulic and brake fluids, transmission and power steering fluids, ozone, acids, bases, and alcohols. It also has strong electrical resistance properties.

Avoid: Cold service below -25°F, ketones, and aromatic hydrocarbons in some grades.

Temperature rating: -25°F to +450°F (-32°C to +232°C), up to +500°F (+260°C) short term.

Shelf life: Unlimited per SAE ARP5316 with proper storage.

Durometers and certifications we offer:

• A75 - Aflas® black, our stock compound. Shop AS568
• A75-MS - AMS 7255 certified 75 duro for aerospace.
• A85 - 85 duro with rapid gas decompression (RGD) resistance for downhole and high pressure gas service.
• A90 - 90 duro black for high pressure.

FFKM Perfluoroelastomer O-Rings (Simriz®)

What it is and where to use it: FFKM is the top of the elastomer food chain. Perfluoroelastomers contain even more fluorine than FKM, which gives them the resilience of a rubber seal with chemical resistance approaching solid PTFE. FFKM handles hydrocarbons, highly corrosive fluids, and even oxygen plasma environments for extended periods. It is the material for chemical processing, petroleum refining, semiconductor manufacturing, aerospace, medical, pharmaceutical, and food processing where nothing else survives. We supply genuine Freudenberg Simriz® compounds because of their durability and the support Freudenberg stands behind them with. Simriz® is the equivalent class of material sold elsewhere as Kalrez®, Chemraz®, and Isolast®.

Temperature rating: Varies by compound, up to +617°F (+325°C) continuous on high temperature grades. See each compound below.

Shelf life: Unlimited per SAE ARP5316 with proper storage.

Compounds we offer: Shop all Simriz® FFKM AS568 | Shop Metric FFKM

• Simriz® 485 - High performance chemical resistant black, 75 duro, -14°F to +446°F (-26°C to +230°C). Shop AS568
• Simriz® 498 - Ultimate high temperature and chemical resistant black, -23°F to +617°F (-31°C to +325°C). Shop AS568
• Simriz® 484 - FDA, USP Class VI, and 3-A certified for food and pharma. Shop AS568
• Simriz® 486 - White pharmaceutical and semiconductor grade, +25°F to +446°F (-4°C to +230°C). Shop AS568
• Simriz® 495 - Chemical processing grade, 75 duro. Shop AS568
• Simriz® 481 - Low temperature black. Shop AS568
• Simriz® 134 - 90 duro RGD resistant for rapid gas decompression service. Shop AS568
• Simriz® 501 - Extreme chemical resistant, AMS 7257 material. Shop AS568

PTFE O-Rings (Polytetrafluoroethylene, AKA Teflon®)

What it is and where to use it: PTFE is the most chemically inert O-Ring material we sell. This white, rigid polymer resists nearly every chemical: acids, bases, oils, solvents, fuels, and steam. It is also tough, abrasion resistant, and naturally slippery, which makes it excellent in valves, chemical processing equipment, and analytical instruments like mass spectrometer probes. The trade-off is that PTFE has no elasticity. It does not compress and recover like rubber, so proper groove design is critical to get a reliable seal. If you need PTFE chemistry with rubber-like recovery, look at our PTFE encapsulated O-Rings below.

Avoid: Applications that need elastic recovery or repeated reassembly, and molten alkali metals.

Temperature rating: -100°F to +500°F (-73°C to +260°C).

Shelf life: Unlimited. PTFE is chemically stable and does not age in storage.

Durometers and certifications we offer:

• TEF - Virgin PTFE O-Rings, white, 55 duro Shore D (PTFE is rigid and is not measured on the Shore A scale). FDA compliant grades available for food contact. Shop AS568 | Shop Metric

Teflon® PTFE Encapsulated O-Rings (FKM or Silicone Core)

What it is and where to use it: These O-Rings solve PTFE's biggest weakness. A seamless FEP fluoropolymer jacket completely encloses an elastomer core of either silicone or Viton®. You get the chemical and temperature resistance of solid PTFE on the outside with the elasticity and recovery of rubber on the inside, which matters in both dynamic and static sealing. Choose the silicone core for the widest temperature range and the FKM core where you need a firmer, more resilient seal in the mid-temperature range.

Temperature rating: FKM core: -10°F to +300°F (-23°C to +149°C). Silicone core: -80°F to +500°F (-62°C to +260°C).

Shelf life: Unlimited per SAE ARP5316. Both the FEP jacket and the FKM or silicone cores carry unlimited ratings.

Durometers and certifications we offer:

• TEV - Teflon® encapsulated FKM core. Shop AS568 | Shop Metric
• TES - Teflon® encapsulated silicone core, FDA compliant. Shop AS568 | Shop Metric
• Effective hardness is set by the core elastomer plus the jacket. These seal best in static and slow-moving applications with good groove finishes.

Urethane Cast Disogrin O-Rings (Polyurethane)

What it is and where to use it: Cast Disogrin polyurethane is the strongest O-Ring material we sell. It is the top pick for wear applications where abrasives, high pressure, and movement are all present at once. Cast urethane O-Rings excel in quick disconnects, high pressure hydraulic and water systems, and nailer and riveting equipment. They are particularly recommended for hydraulic systems with high pressures, shock loads, wide metal tolerances, or abrasive contamination, the conditions that extrude and chew up standard rubber O-Rings.

Avoid: Acids, ketones, and chlorinated hydrocarbons. Some urethanes are also sensitive to water and humidity, especially hot water.

Temperature rating: -115°F to +250°F (-82°C to +121°C).

Shelf life: 5 years per SAE ARP5316. With proper storage (sealed packaging, below 65% relative humidity), urethane O-Rings that pass a visual inspection are good for up to 10 years.

Durometers and certifications we offer:

• UC70 - Cast Disogrin® 6865 TODI, 70 duro. Shop AS568
• UC90 - Cast Disogrin 9251 TODI, 90 duro. Shop AS568
• Metric urethane: Shop Metric Urethane

Urethane EU O-Rings (Millable Polyurethane)

What it is and where to use it: EU millable gum urethane combines hardness with elasticity and delivers outstanding abrasion resistance and tear strength. It costs more than commodity rubbers, so it earns its keep in applications that demand its physical toughness: industrial seals, air guns, paintball markers, pneumatic tools, and other high wear dynamic applications where a Buna-N O-Ring would wear out fast.

Avoid: Acids, ketones, chlorinated hydrocarbons, hot water, and high heat.

Temperature rating: -30°F to +180°F (-34°C to +82°C).

Shelf life: 5 years per SAE ARP5316. With proper storage (sealed packaging, below 65% relative humidity), urethane O-Rings that pass a visual inspection are good for up to 10 years.

Durometers and certifications we offer:

• U70 - Urethane EU 70 duro. Shop AS568
• U90 - Urethane EU 90 duro. Shop AS568
• Metric urethane: Shop Metric Urethane

Butyl O-Rings (IIR, Isobutylene Isoprene)

What it is and where to use it: Butyl rubber's claim to fame is gas impermeability. It lets less gas pass through it than any other common elastomer, which makes it the specialist for vacuum service and gas sealing. It also performs well with glycol based brake fluids, phosphate-ester hydraulic fluids, silicone fluids, and it resists ozone, weathering, and moisture. Butyl also has excellent shock dampening and electrical insulation properties.

Avoid: Petroleum oils, fuels, and hydrocarbon solvents. Petroleum products swell butyl quickly.

Temperature rating: -75°F to +250°F (-59°C to +121°C) typical for standard compounds. Confirm with the compound datasheet for your application.

Shelf life: 15 years per SAE ARP5316 with proper storage.

Durometers and certifications we offer: Shop all Butyl AS568

• Butyl IIR General Purpose 70 Duro - Shop AS568
• Butyl IIR General Purpose 70 Duro FDA - FDA compliant for food contact. Shop AS568
• Butyl Special CIIR High Temp 70 Duro - Chlorobutyl for higher heat service. Shop AS568

Frequently Asked Questions About O-Ring Compounds

What is the most common O-Ring material?
Buna-N (Nitrile, NBR) in 70 durometer. It handles oils, fuels, water, and hydraulic fluids at the lowest cost, which is why it is the default across every industry. If your application involves petroleum products at ordinary temperatures, start with B70.

How do I tell which compound my old O-Ring is?
You usually cannot tell by looking, since most compounds are black. The reliable path is to match the compound to the fluid and temperature in the application. If you know what the seal touches and how hot it runs, we can identify the right material. Color gives hints in some cases: green often means HNBR, blue often means fluorosilicone, rust red is often silicone, and brown or green FKM is common, but never trust color alone.

What does 70 durometer mean?
Durometer is rubber hardness on the Shore A scale. 70 duro is about the firmness of a car tire and is the industry standard. Lower numbers are softer and seal with less force. Higher numbers are harder and resist extrusion under pressure.

Do O-Rings expire?
Some do. Per SAE ARP5316, Nitrile, HNBR, Neoprene, and Butyl are good for 15 years. Polyurethane is rated 5 years, and with proper storage it is good for up to 10 years when it passes visual inspection. EPDM, Viton®/FKM, FFKM, silicone, fluorosilicone, Aflas®, and PTFE have unlimited shelf life. Bad storage (heat, sunlight, ozone, humidity, tension) shortens all of them.

What O-Ring material works with drinking water?
Look for NSF-61 certification. We stock NSF-61 certified compounds in Buna-N (B70-NSF) and EPDM (E70-PC-NSF). EPDM is usually the better pick for water service because of its water, steam, and chloramine resistance.

What is the best O-Ring for high temperature?
It depends on the fluid. For general high heat with oils and fuels, Viton®/FKM handles +400°F (+204°C). For steam and hot water, use EPDM or Aflas®. For dry heat static seals, silicone reaches +400°F (+204°C). For the most extreme service, FFKM compounds like Simriz® 498 run continuously at up to +617°F (+325°C).

What is the best O-Ring for chemical resistance?
PTFE and FFKM resist nearly everything. FFKM gives you that resistance in a true elastomer. Viton® Extreme ETP covers a very broad chemical range at a lower cost than FFKM for applications under 400°F (204°C). Send us your chemical list and we will match the most economical compound that survives it.

Can I use petroleum grease on any O-Ring?
No. Petroleum grease attacks EPDM and butyl. Use a silicone based O-Ring lubricant on those materials. When in doubt, silicone grease is safe on everything except silicone O-Rings themselves, where a PFPE or other non-silicone lubricant is the better choice.

Why choose The O-Ring Store LLC for O-Ring compounds?
We stock deep inventory across all these compounds in AS568 inch and metric sizes, with batch traceability and cure date tracking under our ISO 9001:2015 quality system. Our team supports material selection, sizing, cross-referencing, and chemical compatibility, so you get the right seal the first time. Most stock orders ship the same day. We make getting O-Rings easy!

Still Not Sure Which Compound You Need?

Tell us three things: what fluid the seal touches, how hot and cold it runs, and whether the seal moves or sits still. With those three answers we can recommend the right compound and durometer in a couple of minutes. Call us at (208) 413-6377, use our contact page, or send a quote request.