Hydrosilylation reaction inhibitors and use thereof for preparing stable curable silicone compositions

A composition X comprising at least two separate parts A and B intended to be mixed in order to form a composition X′ in which:

• a) the part A comprises:
• at least one polyorganosiloxane V comprising, per molecule, at least two alkenyl radicals bonded to silicon atoms,
• at least one catalyst E composed of at least one metal belonging to the platinum group,
• at least one inhibitor D1 which is an acetylenic α,α′-diol, and
• at least one organic acid or one inorganic acid D2, with the condition that the inorganic acid does not comprise platinum, and
• b) the part B comprises:
• at least one polyorganosiloxane H exhibiting, per molecule, at least two hydrogen atoms bonded to an identical or different silicon atom, and wherein the composition X is provided in the form of a multicomponent system S comprising the at least two separate parts A and B and wherein the composition X can be crosslinkable and/or cured by a polyaddition reaction.