Capsule for use in a beverage preparation machine

The present invention concerns a capsule (1) defining a closed chamber for enclosing a mass of soluble and/or extractable food material, for use in a beverage preparation machine, comprising: (i) capsule side walls (2), (ii) a top membrane (3) pierceable by injection means (4) of the machine which are adapted to inject an extraction liquid under pressure inside said chamber, and (iii) a bottom wall (5) (iv) means (6, 7) adapted to open said chamber by relative engagement with the bottom wall (5) under the effect of the liquid pressure increase in the chamber during injection of said liquid characterized in that at least the portion of the top membrane surface which is to be pierced by the fluid injection means (4), comprises an elastic material having a tensile strength higher than 1 Mpa, preferably higher than 5 MPa, more preferably higher than 10 MPa and an elongation at break superior to 100%, preferably superior to 500%, such that said top membrane (3) recloses in a leaktight manner, after said fluid injection means (4) have been removed therefrom.