The mixture of emulsifying agents is dispersed in the odourless kerosene. The water is added slowly with constant stirring until a thick w/o emulsion is formed. This is then filled into the containers, and after the valve has been sealed on, the propellant is injected under pressure. The emulsion stability depends to a large extent on the choice of surface active agents, the most successful being mixtures of polyoxyethylene sorbitan esters, sorbitan esters, and esters of polyethylene glycols. In the example quoted above, separation occurs within 2 or 3 minutes but the phases are easily redispersed.
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