NP® SiOPack®: Wax- and polymer-free drop-in coating for enhanced glassine transparency
Technology overview
NP® SiOPack® is a SiO₂-based coating that makes existing glassine paper more transparent. Nanopool supplies the coating technology, not the paper itself. The formulation is free from waxes, polymers, plastics and PFAS.
The technology is validated as a drop-in solution for existing flexographic printing processes and is already in production use at packaging converters.
Converters can apply NP® SiOPack® directly to suitable glassine papers using flexographic printing—either across the entire surface or selectively in defined areas. This enables them to adjust transparency and packaging design within their own production processes.
Applications and benefits
Full-surface application increases transparency across the entire treated paper. Selective application creates areas of enhanced transparency, such as viewing windows, logos, lettering and decorative patterns. Untreated areas retain their original appearance.
Potential applications include: • Product-viewing areas in glassine packaging for food and non-food products. • Selectively transparent logos, lettering and design elements. • Paper-based alternatives to packaging solutions with separate plastic windows.
The drop-in approach enables converters to use suitable existing glassine grades and enhance transparency according to specific packaging requirements.
Performance and production status
Depending on the glassine grade and its initial transparency, transparency values exceeding 93% can be achieved. The achievable result is also influenced by application and process parameters.
Flexographic application has been successfully validated. The coating is already being used by converters under production conditions.
Collaboration opportunities
We are seeking packaging converters, paper manufacturers and brand owners interested in adopting the technology or developing further applications.
Potential collaborations include coating supply, trials on customer-specific paper grades, optimisation of flexographic application and implementation on additional production lines.
NP® SiOPack® enables improved product visibility and greater design flexibility in glassine packaging through a wax- and polymer-free coating applied directly by the converter.
Further information www.siopack.eu/en www.nanopool.eu
About Nanopool GmbH
Nanopool GmbH is a German nanotechnology research and development company founded in 2002 that specializes in functional surface coatings based on proprietary Liquid Glass (SiO2) technology. The company operates as a technology platform, focusing on the development and manufacturing of ultra-thin, transparent, and environmentally friendly protective layers. These coatings are engineered to provide surfaces with specific properties, such as water and dirt repellency, antimicrobial protection, and durability, while largely maintaining the original appearance, feel, and breathability of materials like glass, metal, plastic, textiles, and paper. Their products are developed through interdisciplinary research and are often patented or patent-pending, with a strong emphasis on sustainability and resource efficiency.
By providing tailored coating systems, Nanopool helps partners across diverse industries—including healthcare, construction, photovoltaics, and sustainable packaging—to enhance product performance, improve hygiene, and reduce maintenance requirements. Their SiOPack initiative, for instance, offers a recyclable, plastic-free barrier coating for paper-based packaging that protects against moisture and grease. The company’s solutions have been recognized with numerous scientific and environmental awards and are designed for integration into industrial production processes, helping customers achieve more durable, hygienic, and sustainable material applications.
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