Abstract We report a study on the hydrolytic instability of the oxygen-silicon bond of the following compounds: p-tert-butyldimethylsilyloxytoluène, p-triméthylsilyloxytoluène and poly (p-triméthylsilyloxystyrène). The instability occurs in an acidic media: HCl, H− 2 SO 4, CF 3 CO 0 H, BF 3 or in presence of a salt: KPF 6, KAsF 6, KSbF 6, NaBF 4,[CH 3 (CH 2) 3] 4 NF,[CH 3 (CH 2) 3] 4 NBF 4,[CH 3 (CH 2) 3] 4 NPF 6,[CH 3 (CH 2) 3] 4 N AsF 6,[CH 3 (CH ...