What is EPDM Rubber?

Before the development of EPDM rubber, seals and weatherstripping were made from natural rubber. Natural rubber does not have strong weather resistant properties and degraded when exposed to UV for long periods of time. With the growth of the industry and demand for a UV resistant product, natural rubber could not keep up and meet the complex demands of the industry.

EPDM (Ethylene Propylene Diene Monomer) was developed in the 1960s to meet the increasing demand for innovation in manufacturing.

EPDM essentially mirrors the physical properties of natural rubber and adds the important function of UV resistance.  Since its 20th century birth, EPDM has been a mainstay in the world’s economy.

While EPDM rubber has excellent weathering and aging resistance, there are a few things you should know about its chemical properties.  While compatible with most substances you will find around your RV, there are a few substances that have the potential of degrading EPDM rubber including:

  • Oils
  •  Kerosene
  • Gasoline
  • Halogenated solvents (chloroform is a commonly known example)

EPDM rubber can be shaped in any way and maintains flexibility for a tight seal.  EPDM rubber seals and weatherstripping are used to reduce noise and provide insulation.  Rubber grommets are used to protect and insulate fuel, water and electrical lines from being chaffed.

Steele Rubber Products uses EPDM for our Automotive, Street Rod, RV, Marine, and Universal lines.  Choosing the right seal isn’t just about the profile, it’s also about the quality – and we guarantee ours will exceed your expectations.


Steele not only offers high-quality products, but also the knowledge to help you complete your projects. If you have questions regarding weatherstripping for your classic vehicle, street rod, RV, or boat, don’t hesitate to contact us! Call us at 800-447-0849, send us an email, or chat with us on our website.

*For more help check out our How To series on YouTube!

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