Separation and filtration layer below the base course
Filtration geotextile
Secutex® 251 GRK 4
![Positioning-of-a-Secutex-geotextile-as-seperation-and-filtration-element-in-Railway-construction](https://www.naue.com/storage/2023/02/Positioning-of-a-Secutex-geotextile-as-seperation-and-filtration-element-in-Railway-construction.jpg)
Functions:
- Separation of soil layers with different grain sizes
- Excellent soil retention of the filtration geotextile prevents washing out of lines
![Separation-and-filtration-layer-below-the-base-course](https://www.naue.com/storage/2023/02/Separation-and-filtration-layer-below-the-base-course.jpg)
Advantages:
- High permeability
- Rolls up to 6.0m width
- High frictional interaction