Patent ID: 7411023

Claim:
A polymer pipe for hot fluids, comprising a multimodal polyethylene comprising: a high molecular weight (HMW) fraction, and a low molecular weight (LMW) fraction, wherein said HMW fraction has a density of 0.922-0.930 g/cm 3 and said LMW fraction has a density of 0.955-0.975 g/cm 3 , the multimodal polyethylene having: a density of 0.921-0.950 g/cm 3 , a time to failure at 95° C. and 3.6 MPa of at least 165 h determined according to DIN 16 833, and a modulus of elasticity of at most 900 MPa determined according to ISO 527-2/1B, and wherein the polymer pipe is in the form of a pipe and is constructed to convey water at a temperature of at least 60° C.