Long life guaranteed
Old and dilapidated sewer grids are a major problem for many municipalities and industrial operations. Liners made of GRP offer an economical, sustainable and environmentally friendly solution for the rehabilitation of sewer lines.
The GRP liner utilizes high-grade Advantex-Glas, which is durably resistant against chemicals and corrosion. After tailoring the liner is saturated with a ISO-NPG polyester resin (according to DIN 16946/2) or in case of extremely aggressive waste water with a vinyl ester resin at the plant of the manufacturer of the liner.
Advantages of the GRP liner:
- 1. Material characteristics
GRP liners show significantly higher material characteristics than comparable products due to the reinforcement through the glass fibers used.
- 2. Wall thickness
GRP liner show a higher stiffness at significantly lower wall thickness. Liners made from synthetic fibers show a higher abrasion factor and therefore require more wall thickness.
- 3. Pull-in
The weight of GRP liners is considerably lower than the tensile strength of the longitudinal reinforcement, so that over-stretching or even tearing of the liner is not possible.
- 4. Water tightness
The inner foil of a GRP liner is just an installation aide and is immediately removed after curing. The leak-testing can be done immediately at the cured liner in the sewer line. The saturated GRP material provides tightness and resistance against aggressive media.
- 5. Stretching behavior
As a result of the special textile structure of the reinforcement material the liner is well stretchable radially, yet longitudinally stretching and thus the risk of creasing is prevented.
- 6. Opening of lateral connections
Another great advantage of GRP liners lies in the fact that – compared to liners made of synthetic fibers – they can be cut and reconnected to any laterals within the same 8 hour working day with any of the known technologies.
The special saturating technique guarantees high capacity, great flexibility and short delivery times – a very important aspect for the planning and execution of any rehabilitation project.
After saturation the liner is packed into special styrol- and UV protective foils and placed in an insulated and stable reusable transportation box.
GRP liners are equally suited for curing by steam or UV- light. Both processes are characterized by their minimal energy requirements, small equipment size and brief curing times.