EPDM vs Viton Which Material Is Better for Gaskets O Rings Hoses and Tubing
Choosing EPDM vs Viton is not a simple better-material decision. Your fluid, temperature, pressure, weather exposure and regulatory needs determine which compound will seal reliably. This guide compares both materials for gaskets, O rings, hoses and tubing before you request a quotation
Quick Comparison
Requirement | EPDM | Viton FKM |
Water and hot water | Excellent | Usually limited |
Steam | Good with the right grade | Often unsuitable for hot steam |
UV ozone weather | Excellent | Good |
Mineral oil and fuel | Poor | Excellent |
High temperature | Typically 130 to 150 C grade dependent | Typically 200 C grade dependent |
Low temperature flexibility | Often better | Can be lower |
Relative cost | Usually lower | Usually higher |
Author
Hi, I’m David Xu , Focus on the rubber gasket industry for 20 years. I design customized rubber products solutions,i brings practical insights into material selection,quality control,and application solutions. I’m here to share industry knowledge and best practices for customers and partners.
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EPDM For Water Steam And Outdoor Service
EPDM is selected for water, hot water, glycol, dilute acids and alkalis, ozone, sunlight and outdoor weathering. It suits water-treatment gaskets, plumbing O rings, HVAC seals and outdoor hose or tubing. Standard EPDM should not be specified for petroleum oils, diesel or gasoline without verified compound data.
Viton FKM For Oil Fuel And High Temperature
Viton is a trade name for selected FKM fluoroelastomers. FKM is widely used where mineral oils, fuels, solvents and high temperatures challenge general-purpose rubbers. Polymer family, cure system and formulation matter, so confirm the exact fluid and grade
Chemical And Temperature Compatibility
Check continuous and peak temperature, concentration, pressure, exposure time and cycling. Compatibility charts are screening tools. Validate swelling, compression set, hardness change, tensile retention and leakage after aging.
Which Material Fits Each Product
Gaskets
Use EPDM for water, steam-rated service and weather. Use Viton/FKM for oil, fuel, solvents and higher heat. Confirm flange load, surface finish, thickness and compression
O Rings
EPDM suits water valves, pumps and outdoor equipment. FKM suits fuel, hydraulic oil and hot process fluids. Specify hardness, gland dimensions and static or dynamic motion
Hoses And Tubing
EPDM is common for coolant, water, air and outdoor routing. FKM tubing or lining is preferred for fuel, oil, solvent vapors and high-temperature transfer. Check reinforcement, bend radius, vacuum and permeation
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Illustrative Failure Cases
These are illustrative engineering scenarios, not named RISEUP customer case studies. Replace them with verified records before publication if available.
Diesel Valve In The United State
A team used an EPDM O ring in a diesel isolation valve. The ring swelled and softened, followed by seepage. The corrective path was to review fluid, temperature and gland design, compare FKM O ring and NBR O ring, then test swelling, compression set and leakage on aged samples.
Steam Gasket In Germany
A process skid used a general FKM gasket on a hot-steam connection. Thermal cycles caused hardening and cracks at the sealing edge. The team screened a steam-grade EPDM and alternative geometry, then ran thermal cycling, compression-set and leak tests
Is Viton Always Better Than EPDM
No. Viton is often the safer choice for oil, fuel and high heat. EPDM is usually better for water, steam-rated service, ozone, weather and lower cost. Select the material that maintains sealing after real-fluid aging
How To Choose
List fluids and concentration; record temperatures; define pressure, vacuum, motion and compression; assess UV and ozone; select compound and hardness; test representative parts before production.
Quality Checks Before Release
Request dimensional inspection, hardness, tensile and elongation data, compression-set results and application-matched aging or immersion tests. RISEUP can review drawings, tolerances and test requirements for custom rubber products
Frequently Asked Questions
Q1: Can EPDM be used with fuel?
Generally no. Standard EPDM can swell or soften in petroleum fuel; confirm a special compound or select FKM/NBR and test
Q2: Is Viton suitable for steam?
Often not for hot wet steam. Review the exact grade and cycling; steam-grade EPDM is commonly screened first
Q3: Which lasts longer outdoors?
EPDM usually offers stronger ozone and weather resistance, subject to temperature, compression and formulation
EPDM is usually lower cost, but include replacement, downtime and testing.
Q5: Can I change EPDM to Viton directly?
Not without checking gland fill, hardness, tolerances, friction and compatibility.
Q6: What should I send for a quote?
Drawing, dimensions, fluid, temperature, pressure, quantity, hardness, color and standards.
Final Thoughts
EPDM vs Viton is a compatibility decision. Match the compound to your fluid, temperature and sealing design, then confirm it with representative testing. Review RISEUP EPDM, FKM Viton, gasket and O ring pages before requesting a custom quotation
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Alan Chen
Product Sales Manager & Rubber Specialist at RISEUP
