Essential Guide to Choosing the Right Rubber for Your Project

Why Material Selection Is Everything

When designing a custom rubber component, the material you choose dictates the part's performance, lifespan, and cost. A mistake here can lead to premature failure, costly repairs, or compliance issues.

We’re comparing six of the most widely used elastomers—Natural Rubber, Nitrile (NBR), EPDM, Neoprene, Silicone, and FKM—to help you specify the perfect rubber for your unique operating environment.

1. Natural Rubber

   Derived from the rubber tree, Natural Rubber boasts the best physical properties of any common elastomer, ideal for absorbing high impacts and resisting tears.

   Key Properties :

   - Excellent Tensile Strength as well as tear and abrasion resistance.

   - Superior rebound elasticity and low temperature flexibility.

   - Poor resistance to petroleum based oils, ozone and UV light

   Best Suited Applications :

   - Mounts where high loading capacity and shock absorption are critical.

   - Heavy duty tires, conveyor belts and vibration dampeners.

2. Nitrile Rubber (NBR)

   Nitrile is the industry standard for sealing applications involving contact with oils and fuels. It offers an excellent balance of properties at an affordable cost.

   Key Properties :

   - Excellent resistance to petroleum-based oils, fuels, and hydraulic fluids.

   - Good abrasion resistance and low gas permeability.

   - Poor resistance to ozone, UV light, and highly polar solvents

   Best Suited Applications :

   - O-Rings, Gaskets, and Seals: In automotive engines, fuel systems, and hydraulic equipment.

   - Hoses, Tubing and Industrial Seals

3. EPDM (Ethylene Propylene Diene Monomer)

   EPDM is the workhorse of the synthetic rubber world, known primarily for its excellent resistance to weathering.

   Key Properties :

   - Excellent resistance to weathering, ozone, and UV light.

   - Excellent resistance to polar solvents, hot water, and steam.

   - Poor resistance to petroleum-based oils and fuels.

   Best Suited Applications :

   - Outdoor Seals and Gaskets: Building, construction, and automotive window/door seals.

   - Automotive Cooling Systems: Radiator and heater hoses.

4. Neoprene

   Neoprene offers a balance of properties, prized for its decent resistance to oils, weathering, and its self-extinguishing nature.

   Key Properties :

   - Excellent flame resistance: It is self-extinguishing.

   - Good all-round abrasion resistance and resistance to oils, ozone, and aging (better than NR, worse than EPDM).

   Best Suited Applications :

   - Building and Construction: Seals and weather stripping where fire safety is a concern.

   - General-Purpose Seals and Gaskets in moderate environments.

5. Silicone

   Silicone is unique due to its outstanding performance in temperature extremes, making it the champion for heat or cold.

   Key Properties :

   - Outstanding high and low-temperature performance typically between -60C to 230C

   - Non-toxic, FDA/USP Class VI-compliant grades are available.

   - Poor tensile strength and tear resistance (relatively weak) and poor oil resistance.

   Best Suited Applications :

   - Oven and Appliance Seals and extreme cold applications

   - Medical Devices, Food & Beverage: Tubing and seals requiring sanitation.

6. Fluoroelastomer (FKM)

   FKM is the high-performance, premium material, reserved for the most hostile chemical and high-temperature environments.

   Key Properties :

   - Unmatched chemical resistance: Highly resistant to aggressive fuels, lubricants, acids, and solvents.

   - Excellent high-temperature resistance: Can withstand continuous temperatures up to 250C and higher

   - Costly, and typically the most expensive of the group.

   Best Suited Applications :

   - Aerospace and Automotive Fuel Systems and chemical processing equipment.

   - Oil & Gas Equipment.

Feel free to reach out to us, and we'd be happy to help you identify the right material based on your application.