It bears the shocks caused by the dynamic loads and the static load of the backfill layer .
Ease of installation and maintenance with the appropriate elongation property of the installation process to prevent the formation of internal stresses.

Resists chemicals, especially acids formed in waste water .
It has a smooth inner surface that allows the flow of fluids and foreign bodies inside the sewage.

Flexibility to resist the movement of loose soil

Low coefficient of thermal expansion
Resistant to salts in the soil, especially sulfates