EPDM vs. EPT

Attribute	EPDM	EPT
Material	Ethylene Propylene Diene Monomer	Ethylene Propylene Terpolymer
Chemical Structure	Terpolymer of ethylene, propylene, and a diene monomer	Terpolymer of ethylene, propylene, and a different diene monomer
Temperature Resistance	Good resistance to high temperatures	Good resistance to high temperatures
Weather Resistance	Excellent weather resistance	Excellent weather resistance
Applications	Roofing, automotive seals, hoses, gaskets	Automotive seals, gaskets, weatherstripping

Introduction

EPDM (ethylene propylene diene monomer) and EPT (ethylene propylene terpolymer) are both types of synthetic rubber commonly used in various applications. While they share some similarities, they also have distinct differences in terms of their properties and uses. In this article, we will compare the attributes of EPDM and EPT to help you understand which material may be more suitable for your specific needs.

Physical Properties

EPDM is known for its excellent resistance to weathering, ozone, and UV exposure, making it a popular choice for outdoor applications such as roofing membranes and automotive seals. It also has good resistance to heat, water, and steam, making it suitable for a wide range of industrial applications. On the other hand, EPT offers similar weathering and ozone resistance as EPDM, but it has better resistance to chemicals and oils, making it a preferred choice for applications where exposure to harsh chemicals is a concern.

Mechanical Properties

EPDM has good tensile strength and elongation properties, allowing it to stretch and recover without permanent deformation. This makes it ideal for applications where flexibility and durability are important, such as in seals and gaskets. EPT, on the other hand, has higher tear strength and abrasion resistance compared to EPDM, making it more suitable for applications where mechanical wear and tear are a concern, such as in conveyor belts and industrial hoses.

Temperature Resistance

EPDM has a temperature range of -50°C to 150°C, making it suitable for both hot and cold environments. It also has good resistance to steam and water, making it a popular choice for applications where exposure to moisture is a concern. EPT, on the other hand, has a wider temperature range of -50°C to 175°C, making it more suitable for high-temperature applications where EPDM may not be able to withstand the heat.

Chemical Resistance

EPDM has good resistance to acids, alkalis, and polar solvents, making it suitable for a wide range of chemical applications. However, it may not be suitable for applications where exposure to oils and hydrocarbons is a concern. EPT, on the other hand, has excellent resistance to oils, fuels, and hydrocarbons, making it a preferred choice for applications in the automotive and oil industry where exposure to these substances is common.

Electrical Properties

EPDM has good electrical insulation properties, making it suitable for applications where electrical conductivity is a concern. It also has good resistance to tracking and arcing, making it a preferred choice for electrical insulation applications. EPT, on the other hand, has better resistance to corona and ozone, making it more suitable for high-voltage applications where exposure to these conditions is a concern.

Conclusion

In conclusion, both EPDM and EPT have their own unique set of properties that make them suitable for different applications. While EPDM is known for its excellent weathering and UV resistance, EPT offers better resistance to chemicals and oils. Depending on your specific needs, one material may be more suitable than the other. It is important to consider the physical, mechanical, temperature, chemical, and electrical properties of each material before making a decision on which one to use for your application.