We have reported earlier (IS&T's NIP13) the stabilisation of the ink jet in the flight by means of polymeric additives. On the other hand it was shown theoretically that polymeric additives can influence on vapor bubble dynamics, in particularly they can reduce the bubble growth and (or) collapse. In dependence on different factors this reduction may lead to some jet velocity losses but in the same time it may lead to suppression of cavitation damage of the heater surface. To experimental observation of discussed phenomena the visualisation of vapor bubble growth and collapse in different polymeric fluids was carried out. The polyacrylamide solutions of molecular mass of 500,000 -11,000,000 and concentrations of 0 - 6 % were studied. It was found that only high concentrations of polymer solution causes the considerable reduction of bubble growth and collapse in comparison with pure solvent. These concentrations far exceed the concentrations which provide the most appropriate stabilisation effect on jet flight. In all other investigated cases the bubble dynamics is well described by Rayleigh theory and does not differ significantly from one of pure solvent. Therefore there is the range of polymer parameters which provides the jet stabilisation without the variance in vapor bubble dynamics.