Is rubber an isolator?

Vibration, noise, and even unwanted electric currents can cause problems in machines, vehicles, and buildings. Many people ask: is rubber actually an isolator? The answer is yes—and in more ways than one.

Rubber is an excellent isolator. It is used to isolate vibration, shock, and noise in mechanical systems, and also acts as an electrical insulator due to its high resistance to electric current.

In my factory visits, I’ve seen rubber pads under machines, bushings in cars, and even rubber gloves in electrical work—all using rubber’s natural isolating properties to solve different problems.

How does rubber isolate vibration and shock?

Most commonly, rubber is known for its ability to isolate mechanical vibration and shock.

Rubber’s elasticity and flexibility allow it to absorb and dissipate energy, reducing the transmission of vibration and shock between connected parts. This protects machinery, improves comfort, and reduces noise.

Examples of rubber as a mechanical isolator

I recommend using rubber isolators (mounts, feet, bushings) wherever you want to stop vibration or dampen impact. They are simple, affordable, and effective.

Is rubber also an electrical insulator?

Yes! Another key property of rubber is its ability to resist the flow of electricity.

Rubber is a strong electrical insulator.⁶ It has very high resistivity, so it blocks the passage of electric current. This makes it ideal for electrical safety equipment like gloves, mats, and cable insulation.

Common uses of rubber as an electrical isolator

I’ve supplied silicone and EPDM rubber for high-voltage applications where strict insulation is required.

Why is rubber such a good isolator?

Rubber’s molecular structure gives it unique properties.

Rubber’s flexible polymer chains absorb energy instead of passing it on. Its non-conductive nature blocks electric current, while its elasticity dissipates vibration and shock.

• Mechanical isolation⁹: Protects machinery, reduces fatigue
• Electrical isolation¹⁰: Prevents short circuits, improves safety

Can all types of rubber be used as isolators?

Most rubbers (natural and synthetic) are effective isolators, but specific compounds (like silicone¹¹, EPDM, or nitrile) may be chosen for added heat, chemical, or electrical resistance.

When should you use rubber as an isolator?

Problems from vibration, noise, and impact can damage machines and reduce safety. Customers often look for simple and effective isolation methods.

Rubber should be used as an isolator when you need to absorb vibration, reduce noise, and protect machines from shocks. It offers flexibility, durability, and cost efficiency.

Rubber isolation works in cars, industrial machines, HVAC, and construction equipment. I have seen cases where using the wrong isolator increased failures, while switching to rubber solved the issue.

Conclusion

Rubber is a versatile isolator—used for mechanical vibration, shock, noise, and electrical insulation. Its unique properties protect equipment, improve safety, and make it a key material in countless industries.