This invention relates to a mould for moulding materials, the mould comprising at least two corresponding mould elements moveable relative to one another towards and away from each other, the towards movement exerting pressure on a moulding material positioned within a cavity formed with the mould wherein upon the mould elements being in contact the mould cavity comprises a recess, the recess being located beyond the edge of the moulding to allow escape of gas during moulding.