CSIR–National Aerospace Laboratories (CSIR-NAL) today announced the successful technology transfer of its next-generation solar absorber coating, NALSUN-NG™, to M/s. Helix Solar Private Limited, an emerging clean-tech start up based in Mysuru, Karnataka. The formal agreement was signed on June 23, 2025.

This latest transfer marks a significant push towards self-reliance in solar thermal technologies, supporting national missions such as Make in India, Atmanirbhar Bharat, and the National Solar Mission. The technology enables domestic manufacturing of flat plate solar water heaters, potentially reducing monthly imports of 5–6 lakh evacuated tube collectors.

NALSUN-NG™ is a breakthrough graphene oxide-based solar selective coating, specifically engineered for photothermal applications such as solar water heaters. Developed entirely in-house by CSIR-NAL, it is the first eco-friendly, water-based coating of its kind in India. 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.

Most current commercial coatings use capital-intensive physical vapor deposition (PVD) techniques or contain harmful VOCs. In contrast, NALSUN-NG™ requires minimal investment in infrastructure, has no flammable components, and poses no effluent treatment challenges—making it ideal for local manufacturing and rural deployment.

The coating has undergone rigorous testing aligned with ASTM and International Energy Agency (IEA) standards. It is certified by NABL-accredited laboratories, and its intellectual property is protected under Indian and international patents. With a lifespan exceeding 20 years, NALSUN-NG™ is trademarked and has already been successfully commercialized.

This transfer marks the second successful licensing of the NALSUN-NG™ technology, following its earlier adoption by an industry partner where it has already been commercialized and integrated into solar thermal systems. The repeat interest from the sector underscores the technological maturity and market relevance of this indigenous innovation. Growing interest in this technology is likely to accelerate the deployment of high-efficiency flat plate solar water heaters, reinforcing India's commitment to sustainable energy and climate action.

 

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(Release ID: 2138910)