Viton and Buna are two of the most commonly used elastomers for sealing applications and for good reason. Both of these rubbers serve as great general purpose sealing options. These seals offer excellent compression set resistance, and both options are designed to resist most oils and lubricants, especially petroleum based lubricants. Additionally, moderate temperature applications between 5°F and 250°F are served by both seals, making either seal a perfect choice for general industrial use. However, for more specific applications the decision becomes much more important.