The present invention relates to a kit comprising a paste A and a paste B, whereby (a) paste A contains (a1) at least one monomer for radical polymerisation； and (a2) at least one barbituric acid derivative as polymerisation initiator； (b) paste B contains (b1) at least one monomer for radical polymerisation； and (b2) at least one heavy metal compound as polymerisation accelerator that is selected from the group consisting of heavy metal salts and heavy metal complexes； and whereby i) paste B contains less than 0.01 % by weight, relative to the total weight of paste B, of a peroxide； ii) at least one of the pastes A and B contains, as component (a3) and/or (b3), at least one filling agent that is poorly soluble or insoluble in (a1) and/or (b1), respectively； and iii) at least one of the pastes A and B contains, as component (a4) and/or (b4), at least one inorganic halide salt. The present invention also relates to the use of the kit for producing a paste for mechanical fixation of articular prostheses, for covering skull defects, for filling bone cavities, for femuroplasty, for vertebroplasty, for kyphoplasty, for the manufacture of spacers or for the production of carrier materials for local antibiotics therapy.
