Polyethylene resin, and pipes and pipe joints using same

A pipe formed by extrusion of a polyethylene resin superior in both moldability and long-term physical properties and suitable for both pipe and pipe joint, said polyethylene resin having a density of 0.915 to 0.955 g·cm−3, a melt flow rate of not more than 0.20 dg·min−1 as measured at 190° C. and at a load of 2.16 kgf, a melt flow rate of 17.0 to 70.0 dg·min−1 as measured at 190° C. and at a load of 21.6 kgf, a zero shear viscosity (η0) of 200,000 to 2,000,000 Pa·s, a characteristic time constant (τ0) of 50 to 500 sec., and a ratio (τ0/η0) of 1.0×10−4 to 4.0×10−4 Pa−1, said zero shear viscosity (η0) being obtained by approximating a dynamic melt viscosity (η*, unit:

• Pa·s) with equation (1), said dynamic melt viscosity (η*) being obtained by measurement using a rheometer at 190° C. at a parallel plate spacing of 1.5 mm, at a distortion of 10% to 15% and in the frequency (ω) range of 100 to 0.01 rad·s−1:
• η * = η o 1 + ( τ o · ω ) n ( 1 )
• where n is a shear rate dependence parameter in a high shear rate region.