The Highest Quality Vulcanized O-Rings in the Industry

We Stock Hundreds of Cord Varieties for Every Application


Vulcanized o-rings are made from cut cord stock with both ends fused together, and are a great option for static sealing applications. We apply a liquid form of the uncured material to the ends and join them together in a heated mold. The heat and pressure cause the liquid material to cure and form a chemical bond between the ends with cross-links between the long chain molecules. We inspect 100% of the vulcanized rings we produce before they leave our shop to make sure the material is free from defect and the joint is clean and strong.

What We Offer

Global O-Ring and Seal carries nearly 500 cord varieties with more than 1 million feet of cord in stock – in combinations of the profile, material, cross-section, durometer, and color. We can produce vulcanized o-rings in a round, square, X profiles, and custom profiles.

Standard materials we vulcanize include Buna (Nitrile), Viton® (FKM), Aflas, Neoprene, EPDM, Neo/EPDM Blend, Silicone, and Fluorosilicone.

The cord can be Butt Cut or Bevel Cut. Butt Cut is a straight 90º up-down cut. Bevel Cut, also known as skive cut, slices at a 45º angle, giving more opportunity for surface area contact and added tensile strength. To see more details regarding our cord tolerances, click here.

Our Vulcanized O-Ring Calculator automatically calculates necessary dimensions of a vulcanized o-ring based on cross-section and any other known dimension such as ID, OD, MD, and cut length.


For more information, quotes, expert consultation, or to place an order, call 832-448-5550 or submit the Product Inquiry form.

Product Inquiry

Quality Testing

Each o-ring is individually inspected for fit and finish before leaving our vulcanize shop. Routine samplings of vulcanized products are stretched by our pull tester until failure. Tensile strength, breaking force, and ultimate elongation are recorded and analyzed.

In regularly performing these tests, Global O-Ring and Seal can audit and refine the vulcanization process and continue delivering the highest quality o-rings possible.

Continuous Improvement

We continue to invest to be the best. In doing so, we’ve added equipment such as an automatic cutting machine and computer-controlled vulcanizing machines to further grow in our vulcanization capabilities and production.

Whether your cord is cut automatically or manually, you can be assured we meet or exceed industry tolerance standards.