| abstract |
The present invention relates to high density polyethylene pipes, joints and sealing materials. Specifically, [ problem ]]The invention provides a high-density polyethylene pipe, a joint and a sealing material which can inhibit the deterioration caused by external factors such as radiation. [ means for solving problems]The high-density polyethylene pipe (10), joint, and sealing material of the present invention are provided with: with a density of 0.940g/cm 3 Above 0.980g/cm 3 An inner layer (1) mainly composed of the following high-density polyethylene, a gas barrier film (2) containing an ethylene-vinyl alcohol copolymer resin and covering the outer surface of the inner layer (1), an anti-melt adhesive film (3) containing a resin having a melting point of 150 ℃ or higher and covering the outer surface of the gas barrier film (2), and a resin having a density of 0.910g/cm and covering the outer surface of the anti-melt adhesive film (3) 3 Above 0.930g/cm 3 The outer layer (4) mainly composed of low-density polyethylene. |