EPDM vs. Soft Rubber

Attribute	EPDM	Soft Rubber
Material	EPDM (Ethylene Propylene Diene Monomer)	Soft Rubber
Hardness	Generally harder	Softer
Temperature Resistance	Excellent	Good
Chemical Resistance	Good	Varies
UV Resistance	Good	Varies
Cost	Higher	Lower

Introduction

EPDM (Ethylene Propylene Diene Monomer) and soft rubber are both popular materials used in various industries for their flexibility, durability, and resistance to weathering. While they share some similarities, they also have distinct attributes that make them suitable for different applications. In this article, we will compare the key characteristics of EPDM and soft rubber to help you understand their differences.

Physical Properties

EPDM is a synthetic rubber that is known for its excellent resistance to heat, ozone, and weathering. It can withstand temperatures ranging from -50°C to 150°C, making it ideal for outdoor applications where exposure to harsh environmental conditions is a concern. Soft rubber, on the other hand, is a general term used to describe various types of rubber materials that have a softer durometer. While soft rubber may not have the same level of heat and weather resistance as EPDM, it is often preferred for its flexibility and cushioning properties.

Chemical Resistance

EPDM is highly resistant to a wide range of chemicals, including acids, alkalis, and polar solvents. This makes it a popular choice for applications where exposure to chemicals is a concern, such as in the automotive and construction industries. Soft rubber, on the other hand, may not offer the same level of chemical resistance as EPDM, depending on the specific type of rubber used. It is important to consider the compatibility of the rubber material with the chemicals it will be exposed to in order to ensure optimal performance.

Compression Set

EPDM has a low compression set, meaning it can maintain its shape and elasticity even after being compressed for an extended period of time. This makes it suitable for applications where sealing and gasketing properties are important. Soft rubber, on the other hand, may have a higher compression set depending on the specific formulation. While soft rubber is known for its flexibility, it may not be as resilient as EPDM when it comes to maintaining its shape under pressure.

UV Resistance

EPDM is highly resistant to UV radiation, making it an excellent choice for outdoor applications where exposure to sunlight is a concern. Its ability to withstand UV rays without degrading or losing its properties makes it a popular material for roofing membranes, seals, and gaskets. Soft rubber, on the other hand, may not offer the same level of UV resistance as EPDM, depending on the specific formulation. It is important to consider the intended use of the rubber material when selecting between EPDM and soft rubber to ensure long-lasting performance.

Cost

EPDM is generally more expensive than soft rubber due to its superior properties and performance characteristics. While the initial cost of EPDM may be higher, its durability and longevity can result in cost savings over time. Soft rubber, on the other hand, is often more affordable and readily available, making it a popular choice for applications where cost is a primary consideration. It is important to weigh the upfront cost against the long-term benefits when selecting between EPDM and soft rubber for a specific application.

Conclusion

In conclusion, EPDM and soft rubber are both versatile materials with unique attributes that make them suitable for a wide range of applications. While EPDM offers superior heat, weather, and chemical resistance, soft rubber is valued for its flexibility and cushioning properties. When selecting between EPDM and soft rubber, it is important to consider the specific requirements of the application, including physical properties, chemical resistance, compression set, UV resistance, and cost. By understanding the differences between EPDM and soft rubber, you can make an informed decision on the best material for your needs.