PIPE OF POLYETHYLENE HAVING IMPROVED MECHANICAL PROPERTIES

摘要

The invention relates to a high strength pipe of ethylene polymer having a bimodal molecular weight distribution. Such pipe has a stress cracking resistance of mJ/mm2 and a modulus of creep in flexure, measured according to DIN 54852-Z4, of according to the invention is produced from an ethylene polymer in which the ratio of weight of the low molecular weight fraction to the weight of the higher molecular weight fraction is in the range from 0.5 to 2.0 and which has a melt flow index MFI5/190 .degree.C of g/10 min. It is particularly suitable for the transportation of gases and water.