Abstract: A method of manufacturing a seal which involves printing seal material onto a substrate by printing a first layer of seal material onto the substrate with a stencil, printing a subsequent layer of seal material onto the substrate with a further stencil, and curing or partially curing the seal material, wherein the further stencil has a recess formed therein which accommodates the first layer of seal material printed onto the substrate.

Abstract: A seal or gasket having at least one aperture providing a fluid passageway and intended in use to be clamped by clamping means between surfaces of two parts to be sealed. The seal or gasket comprises conformable elastically-compressible material and relatively-incompressible material bonded therein. The relatively-incompressible material forms an extrusion-limiting barrier which extends at least part-way around the aperture, which is interrupted at intervals by portions of the elastically-compressible material and which is spaced from the aperture by a border portion wholly of the elastically-compressible material.