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flag ISRO successfully tested an upgraded SSLV third stage, enhancing payload capacity and supporting faster, more efficient launches.

flag ISRO successfully completed a 108-second static test of an upgraded third stage for its Small Satellite Launch Vehicle (SSLV) on December 31, 2025, at Sriharikota. flag The test validated a lighter carbon-epoxy motor case, boosting payload capacity by 90 kg, along with improved components including a monolithic composite case and fault-tolerant actuation system. flag The advancement supports ISRO’s goal of rapid, on-demand launches with short turnaround. flag The test marks progress in India’s expanded solid motor production capacity, including new facilities and a world-leading 10-tonne vertical mixer.

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