Urethane vs. Viton

Attribute	Urethane	Viton
Chemical Resistance	Good	Excellent
Temperature Range	-30°C to 90°C	-20°C to 200°C
Hardness	60-95 Shore A	70-95 Shore A
Elasticity	High	High
Abrasion Resistance	Good	Excellent

Introduction

When it comes to choosing the right material for various applications, the decision between urethane and Viton can be a challenging one. Both materials have unique attributes that make them suitable for different purposes. In this article, we will delve into the key characteristics of urethane and Viton, comparing their strengths and weaknesses to help you make an informed decision.

Chemical Composition

Urethane, also known as polyurethane, is a synthetic polymer that is created through the reaction of isocyanates with polyols. This versatile material can be formulated to have a wide range of properties, including flexibility, hardness, and chemical resistance. On the other hand, Viton is a fluoroelastomer that is known for its exceptional resistance to heat, chemicals, and oils. It is composed of a combination of fluorine, carbon, and hydrogen atoms, which give it its unique properties.

Physical Properties

Urethane is known for its excellent abrasion resistance, tear strength, and elasticity. It is a highly versatile material that can be used in a wide range of applications, from automotive parts to industrial seals. Viton, on the other hand, is prized for its high temperature resistance, chemical resistance, and durability. It is often used in applications where exposure to harsh chemicals and extreme temperatures is a concern.

Temperature Resistance

One of the key differences between urethane and Viton is their temperature resistance. Urethane has a lower temperature resistance compared to Viton, making it less suitable for applications where high temperatures are a concern. Viton, on the other hand, can withstand temperatures ranging from -15°F to 400°F, making it ideal for applications where heat resistance is critical.

Chemical Resistance

Both urethane and Viton offer excellent chemical resistance, but Viton is known for its superior resistance to a wider range of chemicals, including acids, oils, and solvents. This makes Viton the material of choice for applications where exposure to harsh chemicals is a concern. Urethane, while still offering good chemical resistance, may not be as suitable for applications where exposure to aggressive chemicals is a primary concern.

Cost

When it comes to cost, urethane is generally more affordable than Viton. This makes urethane a popular choice for applications where cost is a significant factor. However, it is important to consider the overall performance requirements of the application when making a decision based on cost alone. While Viton may be more expensive upfront, its superior performance and durability may justify the higher cost in the long run.

Applications

Urethane is commonly used in a wide range of applications, including automotive parts, industrial seals, and conveyor belts. Its versatility and durability make it a popular choice for applications where abrasion resistance and flexibility are important. Viton, on the other hand, is often used in applications where exposure to high temperatures, chemicals, and oils is a concern, such as in the aerospace, automotive, and chemical industries.

Conclusion

In conclusion, both urethane and Viton have unique attributes that make them suitable for different applications. Urethane is prized for its versatility, abrasion resistance, and elasticity, while Viton is known for its high temperature resistance, chemical resistance, and durability. When choosing between urethane and Viton, it is important to consider the specific requirements of the application, including temperature resistance, chemical exposure, and cost. By understanding the key differences between these two materials, you can make an informed decision that meets the needs of your application.