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Polyurethane vs Rubber: What’s the Difference?

  • May 4, 2019

Polyurethane and rubber are two common materials used in the manufacturing industry. From bushings and gaskets to tires and boots, you’ll find a variety of products made of these materials. But polyurethane isn’t the same as rubber. While both materials offer a high level of elasticity and protection from water ingress, though, they aren’t necessarily the same.

What Is Polyurethane?

Polyurethane is a synthetic material that was first developed by German chemist Otto Bayer during the late 1930s. It’s comprised of organic compounds that are connected with carbamate links. Also known as urethane links, the carbamate links play an important role in the properties of polyurethane, as they affect the material’s level of flexibility and elasticity. Manufacturing companies can alter the physical properties of polyurethane — and therefore products containing polyurethane — by using different types of carbamate links.

What Is Rubber?

There are two types of rubber: natural (organic) and synthetic. The former is made of latex harvested from the rubber tree (Hevea brasiliensis), whereas the latter is made of various synthesized petroleum byproducts. In terms of popularity, synthetic rubber is more popular than natural rubber. Statistics show that about two-thirds of the world’s annual production of rubber consists of synthetic rubber, while only one-third consists of natural rubber.

Benefits of Polyurethane

Polyurethane typically lasts longer than rubber, especially in applications where it’s constantly stretched or otherwise exposed to stress. Both rubber and polyurethane are elastic and flexible. Polyurethane, however, can withstand significantly more cycles of repeated stretching than its counterpart because of its carbamate links. When used in the production of automotive components, polyurethane can often last for the lifespan of the vehicle. Rubber is also long-lasting, but it’s prone to degradation from repeated stretching or stress.

Benefits of Rubber

Even though polyurethane offers numerous benefits, rubber still has a place in the manufacturing industry. For example, rubber is more effective at absorbing vibrations than polyurethane. As a result, you’ll often find anti-vibration bushings made of this synthetic material.

In addition to reducing vibrations, rubber is also quieter than polyurethane. It’s able to absorb and dampen noise more effectively than polyurethane. Therefore, automakers often use rubber to produce seals and gaskets for their vehicles.

Finally, rubber typically costs less than polyurethane. Producing polyurethane is a more complex process, resulting in a higher cost of production compared to rubber. And because it costs more to produce, raw polyurethane generally costs more than both natural and synthetic rubber.

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