DELO presents integrated edge blackening system to enhance AR optical performance
Dec 18, 2025, Windach, Germany - DELO has introduced a complete UV‑curable edge blackening solution that combines high‑performance coating materials, jet valve dispensing, and curing technology within one integrated system. Designed for automated, high‑volume production, this solution helps manufacturers of augmented reality (AR) waveguides and other optical components achieve superior reflection control and process efficiency.
At the heart of the system is DELO’s range of light‑blocking polymer coatings, exemplified by DELO KATIOBOND OE6107. This UV‑curable material features an absorption coefficient of 50 OD/mm (at 800 nm) and, even at a layer thickness of just 60 µm, absorbs more than 99.9% of light, achieving optical densities up to OD 3. Once cured, the coating is completely surface-dry and highly resistant to environmental impact.
The formulation is IBOA‑, PFAS‑, and solvent‑free, contributing to a sustainable and simplified production process without the need for additional solvent evaporation steps. In addition, its long processing time of up to 14 days supports practical handling in automated, high‑volume environments.
Automated precision for next‑generation optics
The coating is applied using the DELO‑DOT PN series jet valve, ensuring precise, contactless dispensing even on complex or narrow geometries such as AR waveguide edges or prism sidewalls. The combination of highly absorbent polymers, jetting technology, and UV‑only curing enables fast cycle times, consistent coating quality, and reduced production costs.
“DELO KATIOBOND OE6107 is just one example of our flexible family of edge blackening polymers,” says Stephan Prinz, Senior Product Manager Optics & Photonics at DELO. “Because the AR industry has not yet established material standards, nearly every customer requires a specific adaptation. With our modular system, we can precisely tailor formulation and processing parameters to individual needs, ensuring both optical performance and manufacturing reliability.”
Traditional edge blackening has relied heavily on manual application — a process that is slow, inconsistent, and uneconomical for large‑scale production. DELO’s integrated material and jetting approach replaces these limitations with a clean, repeatable, and scalable solution suited for manufacturers of AR waveguides, lenses, prisms, and display components.
DELO will present the new edge blackening system at SPIE Photonics West, taking place January 17–22, 2026, at the Moscone Center in San Francisco, CA, USA (Booth 4123). Attendees will have the opportunity to see live demonstrations and discuss customized solution options.