Bonded seals: Flat seals with many positive properties
8 Areas where bonded seals are used
Advantages of bonded sealsThese seals are mainly available as type USF, self-centering, internally sealing.
- simple, quick assembly (loss-proof) non-positive connection
- secure, self-reinforcing sealing
- suitability for high pressures where copper rings are no longer suitable (design and installation instructions; see below
Our complete tool portfolio for bonded seals includes more than 150 sizes - also intermediate inch sizes and rings without self-centering (type U), with external sealing lip (type UA) or type PM1000 for through-bolt fittings.
Bonded seals in the right size
In our online store you can order bonded seals, self-centering (type USF, internally sealing) in 25 common metric sizes from M3 to M48 and also in twelve important inch sizes from 1/8" to 3", which are suitable as flange gaskets and bolt seals.
The minimum order quantity is ten pieces or five pieces from size 1 1/4" or M36. A single bonded seal can be ordered from size 2 1/4".
Shipment on the first working day after order: All common sizes leave our warehouse no later than the first working day after receipt of your order. If you would like to order more than 5,000 sealing rings, please contact us in advance - we will be happy to offer you favorable conditions in this case.
Rubber sealing lip
The commonly used nitrile rubber (NBR), hardness 80+/- 5° Shore A, is characterized by very good oil and gasoline resistance, good mechanical strength and low permanent deformation under pressure. Temperature resistance -30°C - +90°C, low gas permeability.
Note moderate weather resistance and flame resistance, poor resistance to aromatic and polar solvents.
Fluororubber (FKM, Viton), hardness 80+/- 5 °Shore A, is used in the higher-grade version. This is also characterized by very good oil and gasoline resistance, good mechanical strength and low permanent deformation under pressure.
Temperature resistance -20°C - +200°C, very low gas permeability.
This fluororubber also has excellent resistance to weathering (UV light and ozone) and good flame retardancy (self-extinguishing). However, this material is sensitive to the effects of hot water, steam, amines, organic acids and polar solvents. It is also unsuitable as an insulator.
Suitability for low-temperature applications usually ends at approx. -20°C. Please ask us.
Design and installation notes
When installed in this way, pressures up to 1,000 bar (M5 to M27; up to 3/4") or 700-800 bar (from M30; from 1") can be sealed when installed in a counterbore, otherwise up to 400 bar.
The surfaces should be flat, ideally with a roughness class similar to a ground surface. However, surface roughnesses of Rmax <15 µm, Ra <3µm are usually sufficient.
The necessary installation torques/tightening torques can be found in our download section.
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