Lafarge Platres

Daniel Martin

Robert Garcin

Serge Sabio

Th&eacute;o Theuvsen

R&eacute;gis Humbert

Process for the manufacture of plasterboards exhibiting a core density of less than 0.77 comprising the stages of the formation of a foam from water and a surfactant composed of at least one alkyl sulphate of formula H(CH)OSOM, in which n is a number between 6 and 16, M is a monovalent cation and the mean number of carbon atoms nis from 9 to 10, and the introduction of the foam obtained into a plaster slurry, characterized in that the amount of surfactant introduced does not exceed 0.32 g/l of plaster slurry. Application to the manufacture of lightened plasterboards.

Process for lightening plasterboards

A gypsum composition including gypsum, water, and a surfactant composition of alkyl sulfates of formula H(CH)OSOM, in which n is from 6 to 16, the mean number of carbon atoms in the alkyl sulfate composition nbeing between 10 and 11, and M is a monovalent cation. A process for the preparation of the gypsum composition and a gypsum board obtainable from this composition. Finally, a process for the manufacture of gypsum boards. Application for the manufacture of foamed gypsum boards.

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Lyons, France

Daniel Martin