The aim of the following project was to increase the concentration of a ca. 1 wt% styrene butadiene latex emulsion (also termed ’white-water streams’) resulting from industrial production using cross-flow filtration, and to investigate the process performance using different types of membranes. The permeate flux Lie in the range 2.36x10(-5)-0.14x10(-5) m s(-1) when the emulsion was concentrated up to similar to 40 wt%. Although three different membrane types, one organic and two inorganic, with varying cut-off values (20 000, 50 000 and 0.2 mu m) were used, no significant differences in average permeate flow were observed. The concentration of the latex emulsion was seen to have the greatest effect on the permeate flux, and with increasing concentration, the flux was observed to drop to similar to 0. In contrast to this, during continuous testing over a period of nearly two months, using two emulsions of 15 wt% and 1 wt%, respectively, the permeate flow rate remained practically stable.