EPDM vs Viton: Which to Choose and When
EPDM and Viton (FKM) are two of the most widely used elastomers in industry, yet their properties differ fundamentally. The right choice extends product life and prevents unnecessary costs. In this guide we compare the strengths and weaknesses of both materials.
What EPDM is and where it excels
EPDM (ethylene-propylene-diene monomer) offers excellent resistance to weather, ozone, UV rays and steam. It works well with polar substances such as hot water, steam, brake fluids and many acid-base solutions. It is an ideal choice for construction, water supply, automotive cooling systems and outdoor installations.
However, EPDM swells and degrades when in contact with mineral oils, gasoline and petroleum-based products. In these areas oil-resistant NBR rubber is more often recommended.
What Viton (FKM) is and where it excels
Viton is a fluoroelastomer designed for extreme conditions. It shows high resistance to oils, fuels, aromatic hydrocarbons and aggressive chemicals. At the same time it holds its shape at high temperatures. Aviation, oil and gas, the chemical industry and automotive fuel systems are typical applications for Viton. Read more in our article Viton (FKM) and high temperature.
Direct comparison
| Property | EPDM | Viton (FKM) |
|---|---|---|
| Operating temperature | -50 °C ... +150 °C | -20 °C ... +250 °C |
| Oil/fuel resistance | Poor | Excellent |
| Steam/hot water | Excellent | Poor |
| Ozone/UV/weather | Excellent | Good |
| Price | Low | High |
Which to choose and when
- Choose EPDM if the application involves weather, water, steam or polar chemicals and budget is a priority.
- Choose Viton if oil, fuel, solvent or temperatures above +150 °C are present.
Viton is more expensive than EPDM, so using Viton where it is not needed inflates the budget. When selecting a material, temperature, contact medium and mechanical load must be considered together. For a sound decision, our seal selection guide will also help.
At NUR KAUÇUK we manufacture quality products from both materials. To choose the right material for your application, browse our products or contact us for technical advice.