
EnviroCure®-Felt CIPP Liner
Now a Patented Breakthrough in Low-Emission CIPP Technology
United Felts, a Vortex Company, has been awarded U.S. Patent No. 12,467,573 for its EnviroCure®-Felt liner — an industry-first cured-in-place pipe (CIPP) technology engineered to dramatically reduce styrene emissions while delivering proven structural performance.
EnviroCure®-Felt CIPP Liner
Now a Patented Breakthrough in Low-Emission CIPP Technology
United Felts, a Vortex Company, has been awarded U.S. Patent No. 12,467,573 for its EnviroCure®-Felt liner — an industry-first cured-in-place pipe (CIPP) technology engineered to dramatically reduce styrene emissions while delivering proven structural performance.

KEY HIGHLIGHTS & BENEFITS
- Patent-protected styrene encapsulation technology featuring an integrated barrier film that locks styrene into the resin system.
- Ultra-low emissions performance, with third-party jobsite testing showing styrene levels under 1 ppm — far below industry standards.
- Matches the structural strength and durability of traditional CIPP liners with enhanced environmental performance.
- Installs exactly like conventional CIPP, using the same equipment and methods — no workflow changes or retraining required.
- Cost-effective alternative to fully styrene-free liners, offering sustainability without added cost or reduced durability.
- Versatile across applications, including municipal sewer rehab, industrial pipelines, storm drainage systems, and culvert restoration.
- Improves community, environmental, and worker safety through reduced odor and minimized emissions.
- Available nationwide through United Felts’ wetout facilities, ensuring consistent supply and fast turnaround across the U.S.
- Backed by United Felts’ legacy of innovation, quality, and sustainability under its “UNITED TO DELIVER BIG” ethos.
How Does EnviroCure-Felt Work
The patent pending EnviroCure-Felt coating system utilizes a unique combination of polymer materials to produce a flexible membrane for CIPP liners. Unlike traditional CIPP coatings, EnviroCure-Felt creates an impermeable styrene barrier over the entire liner length that does not allow styrene molecules to diffuse through the coating. During the tube transport to the job site, when the ends of the liners are sealed, styrene emissions are contained within the CIPP tubes and do not diffuse into the airspace of the truck. This minimizes the residual styrene migration into the reefer box, minimizing the closed system’s styrene concentration and enhances the installation crew safety.
ANATOMY OF ENVIROCURE-FELT LINER
Features multiple layers of material, which are overlapped to reduce styrene odor and emissions. This multi-layer construction consists of:
- Inner Felt Layer - With Styrene Barrier Coating
- Felt Liner Layers - Resin Saturated
- Pre-Liner - Optional
ANATOMY OF ENVIROCURE-FELT LINER
Features multiple layers of material, which are overlapped to reduce styrene odor and emissions. This multi-layer construction consists of:
- Inner Felt Layer - With Styrene Barrier Coating
- Felt Liner Layers - Resin Saturated
- Pre-Liner - Optional


Technical Data & Case Studies
Technical Data Sheet
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