silane cross - linked polyolefin tubes are used for drinking water and / or water for industrial use , are resistant to a chlorine content ranging from 0 . 1 to 5 ppm , have a minimum degree of cross - linking of 60 %, are produced according to the single - stage process , and are comprised of the following polyolefin composition : a polyolefin ; a mixture consisting of an organic silane of general formula rsix3 , of a radical - generating constituent , and of a catalyst ; a stabilizer mixture consisting of a high - molecular , phenolic constituent having a high melting point , of a sulfur - containing constituent , of a phosphorous - containing processing stabilizer , and of a metal deactivator .