Technical Foundation
What Is a EPDM Tubing?
EPDM (ethylene propylene diene monomer) is a synthetic rubber prized for resistance to heat, steam, ozone, UV and polar fluids like water, glycol and mild acids/alkalis — conditions that degrade nitrile or standard PVC tubing over time. Its saturated backbone gives it excellent weathering and aging resistance, making it the default choice for outdoor tubing runs, steam and hot-water lines, and washdown environments.
EPDM has poor resistance to petroleum oils, fuels and most hydrocarbon solvents, so it should not be substituted for nitrile or fluoroelastomer tubing in fuel or oil transfer service. Tubing is specified by inner diameter, wall thickness and durometer (hardness), with FDA/NSF-compliant grades available for potable water and food-contact applications.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Inner Diameter (ID) | Fractional or metric, e.g. 3/8 in., 10 mm | Must match fitting/barb OD for a leak-tight push-on or clamped connection |
| Wall Thickness | Typically 1/8 in. to 1/4 in. | Thicker wall raises burst pressure and abrasion resistance but reduces flexibility |
| Durometer | Shore A 60–80 typical | Lower durometer flexes more easily around tight bends; higher holds shape under vacuum |
| Temperature Rating | Typically -40°F to 300°F (steam grades higher) | Determines suitability for steam, hot water, or outdoor cold-weather service |
| Fluid Compatibility | Water, steam, glycol, mild chemicals; NOT oils/fuels | Using EPDM with petroleum-based fluids causes swelling and premature failure |
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Applications
Where EPDM Tubing Get Used
EPDM tubing is specified anywhere water, steam or outdoor weather exposure would degrade a standard nitrile or PVC tube.
HVAC & Plumbing
Condensate drain lines and hot water transfer tubing in commercial HVAC and boiler systems.
Food & Beverage Processing
FDA-compliant EPDM tubing for washdown, steam cleaning, and potable water transfer lines.
Outdoor & Irrigation Equipment
UV- and ozone-resistant tubing for exposed irrigation and outdoor equipment runs.
Laboratory & Medical Equipment
Autoclave-safe steam tubing and general-purpose lab fluid transfer lines.
Automotive & Fleet Maintenance
Coolant and heater hose applications where glycol compatibility is required.
Building & Facilities Maintenance
Weatherstripping-adjacent tubing and general MRO fluid transfer in mechanical rooms.
FAQ
EPDM Tubing Questions, Answered
Can EPDM tubing be used with oil or fuel?
No. EPDM has poor resistance to petroleum oils, fuels, and most hydrocarbon-based solvents, and will swell, soften, and eventually fail in that service. For oil or fuel transfer, use nitrile (Buna-N), fluoroelastomer (Viton), or a fuel-rated hose instead.
Is EPDM tubing safe for drinking water and food contact?
Many EPDM tubing products are available in FDA-compliant and NSF-listed grades specifically formulated for potable water and food-contact use, but not all EPDM compounds meet these standards — confirm the specific product's FDA/NSF certification before using it in a food or drinking water application.
What temperature range can EPDM tubing handle?
Standard EPDM tubing typically handles roughly -40°F to 300°F, with dedicated steam-rated EPDM hose rated higher for direct steam service. Actual limits vary by wall thickness and specific compound, so check the manufacturer's pressure-temperature chart for your exact product.
How do I choose the right wall thickness for my application?
Thicker walls increase burst pressure rating and resistance to abrasion and kinking but reduce flexibility and make tight-radius bends harder. For low-pressure gravity drain lines a thinner wall is fine; for pressurized water or steam lines, size up the wall thickness according to the system's working pressure.
Why choose EPDM over silicone or PVC tubing?
EPDM offers better ozone, UV, and weathering resistance than PVC for outdoor or long-term exposure, and is generally lower cost than silicone while still handling steam and hot water well. PVC is a better economical choice for low-temperature, non-outdoor applications, while silicone is preferred where extreme temperature range or superior food/medical purity is required.
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