Seal Guide: How to choose between NBR, Viton, and EPDM? | REIMAN
Seal Guide: How to choose between NBR, Viton, and EPDM? | REIMAN
In the industry, the choice of seals is not made at random. A poor choice of material for your seals can cause premature leaks, costly production stoppages, and even serious risks to the safety of your facilities.
At Reiman, we work daily with three benchmark polymers to manufacture and supply high-performance sealing solutions. Here is our technical guide to help you choose the right seals for your specific temperature and chemical compatibility constraints.
1.NBR – The industry standard
This is the most commonly used elastomer in hydraulic and pneumatic system seals.
Thermal resistance: -30 °C to +100 °C. Ideal for most industrial applications in controlled environments.
Chemical resistance: Excellent against mineral oils, lubricating greases, and hydraulic fluids.
Weakness: Ozone and UV rays. If an NBR seal is left in the sun or near electric motors (ozone), it will crack and break quickly.
Ideal application: Seals for hydraulic pistons, gearbox seals, and sealing rings for standard lubrication systems.
2. Viton™ (FKM) – High Performance
In aggressive environments, Viton is the material of choice for safety seals.
Thermal resistance: -20 °C to +200 °C (withstands higher peaks). Maintains its elasticity where other materials “melt.”
Chemical resistance: Almost universal. Resistant to acids, fuels, and chlorinated solvents.
Weakness: Ketones and esters. Avoid any use in contact with acetone. In addition, the initial cost is higher.
Ideal application: Seals for the petrochemical industry, fuel systems, vacuum systems, and sealing of valves exposed to aggressive chemicals.
3. EPDM - The water and steam specialist
If your seal is to be used outdoors or in contact with hot water, EPDM is unbeatable.
Thermal resistance: -45°C to +130°C (up to 150°C if vulcanized with peroxide). Excellent performance in extreme cold conditions.
Chemical resistance: The best for steam, detergents, and brake fluids (DOT 3 and 4).
Weak point: Oils and hydrocarbons. Placing an EPDM gasket in contact with mineral oil causes it to swell and lose its sealing ability.
Ideal application: Seals for autoclaves, seals for solar panels, cooling systems, and the pharmaceutical industry (where steam cleaning is used).
REIMAN's advice
A seal is a small component with a huge responsibility. At Reiman, we help you select the material that prevents unplanned downtime and ensures the safety of your employees.
Do you have questions about its application?
Contact our technical team for a personalized analysis of your needs.
Tel.: +351 229618090
