Vulcanised 'O'-Rings
Vulcanised "O"-rings are custom-made seals for special uses. They're made from extruded cord, so we can make them to any inside diameter starting at 180 mm. They're a quick, low-cost option when a moulded "O"-ring isn't available.
Benefits of Vulcanised 'O'-rings
Vulcanised "O"-rings are made by joining a cut cord at a 45° angle and vulcanising it, which creates a nearly invisible, very strong seam. They're made to order quickly and come in different sizes, materials, and hardness levels.
- No full moulds needed, so they're cheaper for unusual inside diameters
- Made from extruded cord to meet ISO tolerance standards
- Can be made quickly for any inside diameter above 180 mm
- There's no maximum inside diameter
- The vulcanised joint is very strong
- The joined area keeps the same rubbery (elastic) properties as the rest of the ring
Size Range and Materials
Vulcanised "O"-rings can be made from an internal diameter of 180 mm with no practical upper limit. They're made for special uses and come in common cross-section sizes from 1.78 mm up to 15.00 mm. Fitco Orings supplies these standard materials, and other hardness levels or elastomer types can be made on request.
- Nitrile – 70 / 80 / 90 Shore A
- FKM – 75 / 90 Shore A
- EPDM – 70 Shore A
- Red Silicone – 70 Shore A (white available on request)
- HNBR – 70 / 90 Shore A
Joint Strength
We join vulcanised O-Rings with a 45° scarf cut so there's more surface to vulcanise. This gives a bigger, stronger bond.
Every joint is checked by hand (a light pull and twist) and by a machine tensile test to make sure the joint is as strong as the rest of the cord. This ensures a reliable seal.
Note: avoid extreme bending at the joint — the ring isn't designed to be sharply bent there and it won't be used that way.
