The cross-linkers of the Cross-linker 100 and 200 series are polydimethyl siloxanes comprising SiH groups in the polymer chain. The cross-linkers of the Crosslinker 200 series additionally have terminal SiH groups. Both cross-linker types are used in polyaddition silicones. Both series are available with different viscosity levels and SiH contents. Other SiH contents and viscosity levels can be delivered upon request.