Benefits and Drawbacks of Different Resin Curing Methods

Pipeline rehabilitation through Cured-in-Place Pipe (CIPP) technology has revolutionized the maintenance of underground infrastructure. While selecting the right resin is essential, choosing the optimal curing method is equally critical to project success. Two primary curing techniques dominate the industry: heat curing and UV curing. Each method offers distinct advantages and limitations, suited to different project requirements.

Heat Curing: Traditional yet Effective

Heat curing, which includes hot water and steam curing, was the original method developed for CIPP applications. Hot water curing involves pumping heated water into the resin-saturated liner to initiate hardening. Although compatible with all common resin types, the process is time-consuming—often requiring several hours to complete—leading to extended downtime and higher labor costs.

Steam curing, an improvement over hot water, uses pressurized steam to accelerate the process. It is more efficient in both time and water usage, and performs better in pipes with steep inclines. However, the high temperatures involved can sometimes cause resin blistering, which may compromise structural integrity and hinder flow capacity. Moreover, both heat-based methods involve the release of volatile organic compounds (VOCs) and styrene, posing safety and environmental concerns.

Despite these drawbacks, heat curing remains a cost-effective solution for many conventional applications, particularly where UV equipment may not be available.

UV Curing: Modern, Efficient, and Sustainable

UV curing has emerged as a advanced alternative that overcomes many challenges associated with heat-based methods. This approach employs ultraviolet light to rapidly cure epoxy-resin saturated liners, often in as little as 90 seconds per segment. The process is not only quick but also emission-free, eliminating VOC and styrene release, which enhances on-site safety and reduces environmental impact.

One of the most significant advantages of UV curing is its precision and reliability. Using robotic cameras and light trains, the curing process can be monitored in real-time, ensuring uniform hardening and exceptional finished quality. The resulting pipe is typically stronger, more durable, and more resistant to chemicals and abrasion compared to heat-cured liners.

Additionally, UV CIPP does not require large volumes of water or complex heating equipment, simplifying logistics and reducing the carbon footprint of rehabilitation projects.

Conclusion: Matching the Method to the Mission

While heat curing remains a viable and economical option for certain scenarios, UV curing represents the future of trenchless pipeline rehabilitation—particularly for projects prioritizing speed, safety, and long-term performance. At Anyue, we specialize in manufacturing high-performance UV-CIPP liners and systems that help engineers and municipalities deliver reliable, sustainable, and cost-efficient pipeline renewal. Our technology integrates seamlessly with modern inspection and curing equipment, ensuring superior outcomes with minimal disruption.

Whether renewing municipal sewers, industrial pressure pipes, or delicate historical infrastructure, choosing the right curing method ensures not only a successful installation, but a lasting solution.