Resin UV cure

A resin UV cure system hardens within minutes when exposed to ultraviolet light. That speed makes UV curing the preferred technology for many trenchless sewer rehabilitation projects. AOC offers a broad portfolio of light-curing resins for CIPP liners, laterals and prepregs, supported by application development and technical service.

How UV curing works

UV-curable resins contain a photo-initiator system. When the liner is exposed to UV light, the initiator starts the cross-linking reaction. Because cure only begins under the light source, the resin offers a long working time before installation and a fast, controlled cure afterwards. Note that UV curing is different from UV stabilisation, which protects a cured part against sunlight.

Resin UV cure for CIPP relining

AOC provides UV-cure solutions for main sewers, laterals and drinking water pipes:

• Iso/NPG resins, such as Palatal® P 92 I-03, P 92 I-04 and L720-LCI-05.
• MgO-thickenable Ortho/NPG resins, such as the Synolite™ 2103-Q series.
• Thickenable vinyl esters, such as Atlac® E-Nova RE 3475 X and Palatal® A 429 I-02 X for UV-curable prepregs.
• Styrene-free vinyl esters, such as L050-LCA-03 for laterals and L050-LCW-03 RA FC for drinking water pressure pipes.
• BPA-free, styrene-free options, such as Beyone™ 620-Q-01.

Curing thicker layers

Thick liners need a balanced approach to make sure the full wall cures. Formulations without photo-initiator, such as L730-LCS-04 and L730-LCN-01, allow liner manufacturers to add their own initiator package and control cure through thicker layers.

Beyond CIPP

UV curing is also used for other composite parts that benefit from fast, on-demand cure. Beyone™ 120-Q-01 is a styrene-free vinyl ester with a photo-initiator system for such applications.

Frequently asked questions about resin UV cure

How long does UV curing take?

Cure starts as soon as the resin is exposed to UV light and is typically completed within minutes, depending on wall thickness and the light source.

Is UV-cure resin suitable for drinking water pipes?

Yes, with dedicated formulations. L050-LCW-03 RA FC is a styrene-free vinyl ester for UV-cure CIPP relining of drinking water pressure pipes.

Choose your resin UV cure system with AOC

Liner design, wall thickness, light source and host pipe all influence the right choice. Visit our CIPP/relining market page or contact our experts to select the resin UV cure system that fits your installation process.