A curable composition apportioned between at least one Part A and at least one Part B, the Parts sealed within barrier means in manner to prevent contamination thereof, the composition comprising: (i) one or more alkenyl-containing prepolymers having at least one alkenyl moiety per molecule, ii) one or more SiH-containing prepolymers having at least one SiH unit per molecule, and additionally: (iii) a catalyst for curing by addition of alkenyl-containing prepolymer (i) to SiH-containing prepolymer (ii), wherein the at least one Part A and at least one Part B are provided within or upon at least two respective receptacles or supports and are adapted to be dispensed or released therefrom in cooperative manner facilitating intimate contact and curing thereof, wherein the receptacle(s) or support(s) for at least one of Part A and Part B is thermally stable at elevated temperature of 123 C for a period in excess of 18 hours, methods for preparing the composition, methods for sterilisation thereof, medical and non-medical use thereof, a device incorporating the composition, and a precursor therefor including its sterilisable precursor composition, in particular a terminally sterilisable or terminally sterile composition for medical use, particularly in wound therapy, more particularly as a wound packing material which can be shaped and configured to the shape of a wound, most particularly for application in negative pressure wound therapy (NPWT).Una composición curable repartida entre por lo menos una Parte A y por lo menos una Parte B, las Partes selladas estando dentro de medios de barrera en forma de evitar la contaminación de las mismas, la composición comprende: (i) uno o más prepolímeros que contienen alquenilo que tienen por lo menos una porción alquenilo por molécula, ii) uno o más prepolímeros que contienen SiH que tienen por lo menos una unidad de SiH por molécula, y, adicionalmente: (iii) un catalizador para el curado por adición del prepolímero que contiene al
