Static sealing solutions for all industries

Bonded Seals

High-pressure sealing solution

The bonded seal (also known as Dowty Seals and Dowty Washers) consists of a metallic insert with a vulcanised rubber compound profile which is bonded to the internal diameter. The bonded seal has been developed to obtain both pressure resistance and vibration resistance in high pressure and temperature conditions where metallic washers are unsuitable.

The dowty seals can be used in a wide range of applications in the fluid transfer area. These include: fuel systems, HVAC systems, hydraulic systems and pneumatic systems.

Our Dowty Washers are made in Europe, in our production plant in the UK (Newtown) and Malta (Gozo).


The type of metal and the compound used will vary according to the type of fluid in the application, the operating temperature, etc.

The metal insert is available in different materials such as mild steel, stainless steel, brass, aluminium, etc.

Where necessary an anti-corrosion surface treatment is also available. The range of compounds includes NBR, HNBR, FKM, EPDM, etc.

Compounds can also be developed according to customer needs.

An improvement to the original design is the self-centering bonded seal which will allow ease of assembly and eliminate the risk of offset. Apart from a standard range of sizes, Hutchinson can develop and provide custom solutions for customer needs.