The invention relates to a chrysotile asbestos fiber substantially coated on its exterior surface with hydrated titanium dioxide, the titanium dioxide content being from 0.5 to 35% by weight, part of the titanium dioxide being chemically bonded to the asbestos fiber and the remaining titanium dioxide being retained by electrostatic bond, said modified fiber having an Mg:Si ratio of from less than 3:2 to 2:2 when calculated on an atomic number ratio, a Ti:Si ratio of from more than 0:2 to less than 1:2 and said modified fiber being also characterized by an infrared spectrum wherein the relative peaks at 1082, 1025 and 957 cm.sup. -1 have been substantially altered in their intensity and as shown in curves C and D of FIG. 1 , said fiber resisting leaching of the Mg ions by strong acids 3 to 6 times better than natural asbestos fibers and resisting leaching of SiO.sub.2 groups in strong alkali media 1.5 to 3 times better than unmodified chrysotile fibers. The novel titanated fibers are useful in the manufacture of diaphragm for separating the electrode compartments of electrolytic cells.
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