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Styrene-free product is ideal for the trenchless rehabilitation of wastewater and stormwater pipes in high-traffic public spaces.

For styrene-free pipe lining

The SAERTEX-LINER ENVIRONMENT is the styrene-free product in our GRP pipe liner portfolio. With no styrene emissions, this liner is ideal for the trenchless rehabilitation of wastewater and stormwater pipes in high-traffic public spaces. It is available in two design variants.

  • Type S+: best mechanical characteristics and interesting number of
  • variants Type S+ XR: suitable for pressure lines up to 33 bar


Conpiles with high emission requirements

Impregnation with styrene-free vinyl ester resin means the SAERTEX-LINER ENVIRONMENT is free from the typical styrene odor. It is therefore ideal for UV-CIPP rehabilitation work performed in public foot traffic areas.

Best long-term characteristics 

Its mechanical properties make SAERTEX-LINER ENVIRONMENT suitable for many typical applications: It has a long-term circumferential E modulus of 9,450 N/mm2 and an excellent preliminary reduction factor of 1.37 after 2000 hours of testing.

With DiBT approval

The SAERTEX-LINER ENVIRONMENT is the first fiberglass reinforced pipe liner impregnated with styrene-free VE resin on the market and approved by the German Institute for Building Technology (DIBt).

Installation-friendly construction

The construction of the SAERTEX-LINER ENVIRONMENT allows high pull-in forces and prevents the liner from overstretch. Its low weight makes for easy handling, the low wall thicknesses shorten curing times, and, in the "FastPlus" variant, the pipe liner saves even more installation time.


Product range


Medium municipal wastewater and rainwater
Resin type SFVE
Temperature and media resistance +
Styrene free? yes
Design Typ S+ Typ S+ XR
Old pipe profile Various Circular Circular
Application Gravity Pressure Pressure
Pressure Application
Operating Pressure [bar] up to 1 up to 33
Fully statically loadable*
DN [mm] 150–1,500 250–1,200 250–1,200
Composite wall thickness [mm] 3–12 4–12 4.3–12.3
Outer foils:
- Integrated gliding and UV light protection foil
- Permanent foil with barrier function Inner
Outer foil with barrier function:
- Standard (temporary)
- FastPlus (semi-permanent)** Selectable
- Pressure (permanent)
Mechanical Characteristics
Short-term circumferential E modulus [N/mm²] ≥ 12,950 ≥ 20,500
Long-term circumferential E modulus [N/mm²] 9,450 16,000
Short-term bending E modulus [N/mm²] ≥ 15,000 ≥ 16,800
Short-term bending stress [N/mm²] ≥ 230 ≥ 270
Long-term bending stress [N/mm²] 165 210
Reduction factor according to DIN EN 761:
- 10 years [after 2,000 hours] 1.37 1.28

*Structural classification for pressure applications | Class A DIN EN ISO 11295 // Class IV AWWA M28

**FastPlus available for DN 200 to DN 1500 max WD 12 mm

Preliminary characteristics

Our SAERTEX-LINER ENVIRONMENT still showed excellent characteristics after 2000h of testing to match a wide range of typical rehabilitation projects (status as at 4/2021). Feel free to contact us for the present status of the 10,000h test.

Saves time and provides extra protection

This rugged inner foil remains inside the liner after curing and saves your team about 1h of installation time for every 100m liner. FastPlus also makes it easier to introduce the UV source, even in difficult installation conditions.

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