Curable addition crosslinkable organopolysiloxane materials employing a
platinum catalyst selected from the group consisting of compounds of the formulaand / or oligomeric or polymeric compounds which are composed of structural units of the general formulaand optionally structural units of the general formulain whichR2, R3, R4, R6, R7, R8, R9, r, s and t have the meanings stated in claim 1, may be prepared as one-component formulations having prolonged
shelf life, or as two-component formulations having prolonged pot life, while maintaining desirable chemical and physical properties.