When your current seal isn’t up to the task or when you are faced with a sealing problem, COS has the resources to develop a new seal to match your exact needs, ensuring that you receive the most durable seal design made with the
right material for your application. Our engineers are uniquely qualified to understand your exact needs and will work with you not only to design your seal, but also to help you design the optimum hardware and seal housing for peak performance.

Custom-engineered seals are available:

  • Up to 98” (2500mm) in diameter
  • Temperature: -450°F (-270°C) to +600°F (+318°C)
  • Pressure: vacuum to 50,000 psi (3450 bar)
  • Low friction & low wear
  • Harsh & corrosive environments.

Here are some of the ways we assist our customers:

With the aid of our sophisticated proprietary seal design software and 3D modeling software, we can design virtually any seal very quickly, thus reducing design and development cost. From design to prototype takes only a few days.

Selecting the right material for the application is the first and most critical step in designing a custom seal.

COS engineers understand advanced sealing materials. We have an ongoing commitment to use the highest grade of materials to give our customers maximum seal durability. We partner with leading edge raw material developers to make new and advanced materials available to our customers in the seals we make for them.

Our Custom Engineered Seals are available in a wide range of sizes and materials. Our materials include: Polyurethane; Nitrile; Viton®; H-Nbr; water resistant (hydrolysis resistant) Polyurethane; high-performance Polyurethane; Silicone; FDA materials; Aflas®; Kalrez®; EPDM; Hytrel®; UMWPE; Tefzel®; Peek and a range of proprietary filled Teflon® (PTFE). Many specialist Duralast™ and Permachem™ elastomers as well as Duraloy™ Engineering Plastics were developed to match real world applications, and on many occasions we have developed a special grade to solve a customer’s current application difficulty.


The engineers of COS have a lifetime of experience in designing and manufacturing seals, gained on 5 continents over the past 25 years. With lots of practical and theoretical experience, our engineers are uniquely qualified to understand your exact needs, ensuring you get the right seal in the right material.


Our manufacturing process means that seals can be produced in a wide range of material and size options! Even nonstandard material and size options are generally available with a 1-4 day turnaround without tooling cost.


COS Custom Engineered Seals are currently in successful service in the following industries: underwater vehicles; food dispensing equipment; oilfield exploration and production; steel mill equipment; drilling equipment; paint and solvent manufacture and application; construction equipment; military and defense; chemical pumps and valves; liquid handling swivel joints; space exploration; pharmaceutical production; aerosols; adhesive dispensing systems; liquid gas control systems; high pressure hydraulics; cryogenic liquid control components; racing engines; and domestic heating, among others.

If you need any help, please contact us