Composition crosslinkable silane polmero

A polymer composition comprising a polyolefin (a) supporting units containing group or hydrolysable silane groups, wherein: - the number of units containing group or hydrolysable silane groups is 0.010 to 0.081 mol / kg polyolefin (a ), when measured according to "the amount of group or hydrolysable silane groups" as described below under "determination methods", and wherein - the polymeric composition has an elongation of hot-setting exceeding 30%, when It measured according to "Test elongation hot-setting" using a sample of crosslinked cable as described under "determination methods" after crosslinking of the sample in water at 90 ° C for 20 hours