Krah Pipes are made of polyolephins. The inherent weaknesses of materials such as concrete, clay, ductile, PVC and steel caused tremendous problems in existing sewer pipe systems as they tend to brittle or are too sensitive to aggressive chemicals and soil conditions.
However, polyethylene and polypropylene are thermoplastics with excellent properties for the application of water and sewage as well as for fabrication of containers for liquids and solid materials.