with both pvoh and surfactant sample 4 demonstrated good hydrostatic barrier properties on the cellulose substrate but was not as efficient on the structured substrate compared to sample 5 effect of varying the ratio of pvoh protected vae and paraffin wax emulsion in the blend the ratio of the pvoh protected airflex rb 18 vae polymer emulsion and paraffin wax emulsion was varied to determine the effect of paraffin wax on the hydrostatic head properties of the coating on a 100 cellulosic web results are presented in table 2 the data show that increasing the paraffin wax level from 0 to 70 of dry solids improved the hydrostatic head barrier properties of the coated substrate effect of varying the amount of paraffin wax emulsion with airflex rb 18 vae polymer emulsion in the coating formulation was studied coatings were spray applied at a 12 solids level and dried at 270 u00b0 f 132 u00b0 c for 3 minutes the results of measuring hydrostatic barrier properties of the coated substrates are presented in table 3 below the data show that hydrostatic head increases with increased levels of paraffin wax up to 40 paraffin wax and then remains relatively level or declines effect of paraffin wax particle size and composition on hydrostatic barrier head a paraffin wax polyethylene emulsion blend having a particle size of 0 035 microns was compared to the michem me 70950 paraffin wax emulsion having a particle size of 0 35 microns both were combined with airflex rb 18 vae polymer emulsion the results of measuring hydrostatic barrier properties of the coated substrates are presented in table 4 below the data show that although both formulations provide good.