Tue Jun 24 04:38:18 UTC 2025: Here’s a summary of the text and a rewritten version as a news article:

**Summary:**

India’s National Aerospace Laboratories (CSIR-NAL) has successfully transferred its innovative NALSUN-NG solar absorber coating technology to Helix Solar Private Limited, a clean-tech startup in Mysuru. NALSUN-NG is a graphene oxide-based, eco-friendly, water-based coating for solar water heaters, offering a sustainable alternative to conventional coatings reliant on harmful VOCs and expensive physical vapor deposition. The coating has been rigorously tested and certified, boasts a long lifespan, and is already being commercialized. This marks the second successful technology transfer of NALSUN-NG.

**News Article:**

**Indian Innovation: NAL Transfers Eco-Friendly Solar Coating Tech to Helix Solar**

**Bengaluru, June 24, 2025:** The National Aerospace Laboratories (CSIR-NAL) in Bengaluru has announced the successful transfer of its next-generation solar absorber coating technology, NALSUN-NG, to Mysuru-based clean-tech startup, Helix Solar Private Limited. This development promises to boost domestic manufacturing of flat plate solar water heaters and reduce India’s reliance on imported evacuated tube collectors.

NALSUN-NG is a groundbreaking graphene oxide-based solar selective coating developed entirely in-house by NAL. The technology is specifically designed for photothermal applications, particularly solar water heaters. What sets NALSUN-NG apart is its eco-friendly, water-based composition. Unlike traditional coatings that rely on volatile organic compounds (VOCs) and flammable solvents, NALSUN-NG uses only non-toxic, RoHS- and REACH-compliant inorganic materials.

“This technology allows for domestic manufacturing of high-performance solar water heaters, which would reduce our monthly imports of five to six lakh evacuated tube collectors” said an NAL spokesperson.

The coating also addresses the challenges associated with current commercial coatings that use capital-intensive physical vapor deposition (PVD) techniques. NALSUN-NG requires minimal infrastructure investment and poses no effluent treatment issues, making it ideal for local manufacturing and rural deployment.

Having undergone rigorous testing and certification aligned with ASTM and International Energy Agency (IEA) standards, NALSUN-NG has a lifespan exceeding 20 years. The technology is trademarked and has already been successfully commercialised.

This transfer marks the second successful licensing of NALSUN-NG, following its earlier adoption by another industry partner where it has been successfully integrated into solar thermal systems. This milestone underscores India’s growing innovation in renewable energy technologies and its commitment to sustainable manufacturing practices.

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