Underground anti-termite PVC pipe for transporting water from/to e.g. sewage and/or swimming pool installations, has external layer including protective film having thickness that is smaller than thickness of interior layer

摘要

The pipe (1) has an external layer (2) contacting with a ground when the pipe is buried in the ground, and an interior layer (3) contacting directly with liquid to be transported. The external layer and the interior layer are made out of respective polymeric materials containing rigid PVC and plasticized PVC. The polymeric material of the external layer includes an insecticidal agent, and the polymeric material of the interior layer is free from the insecticidal agent. The external layer includes a protective film having thickness (S1) smaller than thickness (S2) of the interior layer.