Flat seals

The seal is assured by a beading of elastomer fitted to the inside or the outside of the sheet. The shape of the beading and its attachment to the sheet are designed in such a way that the compression of the elastomer absorbs the faults in the flatness and deformation due to expansion while remaining within acceptable stress constraints.

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When the fixing screws of a crankcase are being tightened, the reaction of the sealing element (paste or paper) can cause a deformation of the flatness of the seal. This deterioration of flatness often causes leaks when expansion occurs.

To solve this problem, Paulstra offers a metallic-elastomeric seal.

The metal part consists of a thin sheet. The fixing screws which act on this rigid material haven o effect on the flatness of the crankcase.