The invention relates to additive mixtures for plastics containing phosphinic acid of the formula (I) as component A, wherein R1 and R2 mean ethyl, M is AI, Fe, TiOp or Zn, m means 2 to < 4, preferably 2 or 3, and p = (4 - m) / 2 is a compound selected from the group of AI, Fe, TiOp or Zn salts of ethylbutylphosphinic acid, dibutylphosphinic acid, ethylhexylphosphinic acid, butylhexylphosphinic acid and/or dihexylphosphinic acid as component B, phosphonic acid salt of formula (II) as component C, wherein R3 means ethyl, Met is AI, Fe, TiOq or Zn, n means 2 to 3, and q = (4 - n) / 2, and antimony, tin and/or indium as component D. Polymer compositions containing said additive mixtures are characterized by exceptional flame protection and by very good laser markability or laser weldability.