March 2023 Vol. 78 No. 3


What is the difference between UV and Bluelight LED?

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Light-cured lateral CIPP lining is one of the most popular trends in trenchless rehabilitation technologies and one of the questions we hear a lot is, “what’s the difference between Bluelight LED and UV?”

All light-curing systems are based on photo-initiating resin, meaning the resin is specially formulated to cure only when exposed to a specific range of wavelengths of light within the electromagnetic spectrum.

Light penetration and exposure time are incredibly important for curing quality in all light-cured systems, and this fact shaped how our Bluelight system was developed. If the curing light does not fully penetrate the resin, or if the exposure time is too short, the outer layers of the CIPP may not cure properly where the liner meets the host pipe. This also effects the overall strength of the CIPP composite, which may not meet ASTM F1216 standards.

The biggest difference between Bluelight and UV lateral CIPP systems is the wavelength of the light used. UV systems cure using ultraviolet light which is a wide range of wavelengths from 100 to 400 nanometers. The Bluelight system cures using specifically blue light (hence the name!) which is a very focused range of visible light: 444 to 457 nanometers (nm). This makes a huge difference in the quality and speed of the cure, and its why HammerHead’s light-curing system uses Bluelight rather than UV.

The wide spectrum of UV light is less intense and lower in wattage than blue light, which can create issues penetrating the resin leading to an incomplete cure. UV-cured resins are typically used with liners constructed with fiberglass and a reflective outer foil to help refract the UV light and increase its ability to penetrate the resin. Even with these additions, cures are less consistent with UV light than with Bluelight due to the weakness of penetration.

The Bluelight system’s patented LED light head ensures deep penetration and a complete cure that does not rely on glass or foil in the liner. The static head design with 360-degree LED lights ensures the entire circumference of the liner is exposed to light throughout the cure. The Bluelight system’s smart technology manages the light head travel speed based on the liner diameter and thickness. Taking the guesswork out of light head pullback speed ensures that light penetrates the resin fully to ensure an efficient and complete cure every time.

About HammerHead Bluelight LED Lining System

The Bluelight LED CIPP lining system from HammerHead® Trenchless is the most advanced light-curing system available for the rehabilitation of laterals and small drainpipes. The innovative technology empowers CIPP installers by alleviating the time pressures of other lining systems. The specially formulated resin only cures under light in the blue wavelength (444 - 457 nm) giving installers unlimited working time between liner wet-out and curing. Once the liner is in place, the automated curing system pulls the LED light head through the liner, curing the resin almost instantly – as fast as 5.4 feet per minute. Instead of waiting hours for the liner to cure, a 50’ sewer line could be fully cured in under 10 minutes. The HammerHead Bluelight system features an intuitive touch-screen interface and three light head options to cure liners 3 to 10 inches in diameter. For more information, visit; 800.331.6653


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