A kit for preparing a paste-like bone cement, comprising a paste A and a paste B, wherein paste A contains (a1) at least one monomer for radical polymerization, (a2) at least one polymer that is soluble in (a1) and (a3)at least one polymerization initiator and paste B contains (b1) at least one monomer for radical polymerization (b2) at least one polymer that is soluble in (b1) and (b3) at least one polymerization accelerator wherein at least one of the pastes A and B contains as component (a4) and/or (b4) at least one filling agent that is poorly soluble or insoluble in (a1) and/or (b1), respectively, and wherein the filling agent is a particulate inorganic filling agent possessing a BET surface of at least 40 m2/g.
