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In this work it is applied the soap fraction obtained as by-products in the extraction process from sterols as emulsificant agent in the wax-water emulsion formulation, furthermore, these emulsions are used to substitute the paraffin emulsion in the process of manufacture of bagasse boards. They were effected several experimental runs to evaluate the influence of the wax per cent in the emulsion on the expansion per cent in water of the boards, parameter established by the Cuban procedures to evaluate the quality of the bagasse boards; furthermore they were determined other properties having all satisfactory results and demonstrating the feasibility of the substitution of the paraffin (high price in the international market) by the cane wax (national raw material). [ABSTRACT FROM AUTHOR]