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Seal Selection Guide

Seal selection begins with choosing the right compound, hardness, and shape for your application. To ensure proper sealing, the force that’s required to displace a profile depends upon a combination of all three factors. During compound selection, for example, you might choose a sealing material because of its resistance to heat and oil. But your choice of an elastomeric material does not explain why a 90-durometer solid square is harder than a 30-duromter circle. 

O-Rings and Profile Gaskets

Both shape and hardness also play a role in the seal’s resistance to compression. That’s why selecting a rubber seal is a task that varies in complexity. The O-ring is a simple, standardized design that’s used worldwide because it addresses many needs. Profile gaskets are more complex, and require both the buyer and the sealing supplier to consider the entire manufacturing process. 

Standard Seals and Custom-Fabricated Solutions

For over 20 years, Elasto Proxy has offered standard products from our catalog and shipped kits that let customers hold samples in their own hands. At the same time, our experienced solutions providers have also worked with customers in wide range of industries to find custom solutions to design challenges. As a custom fabricator, Elasto Proxy can help you to improve your existing designs or create new ones.      

Seal Shape and Seal Hardness

The diagram on this page describes the relationship between seal shape and seal hardness. Solid profiles are the hardest and most resistant to compression. They range from under 30 to over 120 duro. At 40 duro, solid rubber profiles have the consistency of pencil erasers. At 90 duro, they are hard like hockey pucks. Solid profiles of all duro levels can be molded into various shapes and sizes. Sponge profiles can also be shaped, and are usually characterized as soft, medium, and firm.

Compound selection can be a complex task since the term “rubber” may refer to a variety of energy-absorbing materials with synthetic, natural, organic, or inorganic components. In addition, some rubbers (such as Viton® from DuPont Dow Elastomers) are trade names. Service conditions for rubber vary by physical and chemical characteristics, but also by the application and size of the rubber component.

As your supply chain partner, Elasto Proxy offers this Seal Selection Guide along with other on-line tools (such as our Numbering System) to help you select the right plastic and rubber components. So whether you need standard seals from our catalog or custom-fabricated sealing solutions, we’re ready to listen to all of your needs and help guide you.