Funding · Climate, Energy & Sustainability

CarbonStrong secures Rs 12.5 crore seed round

By Startup Enthusiast · 25 August 2026

What they do

CarbonStrong is a Bengaluru-based climate-tech company that creates low-carbon binders using upcycled industrial waste to substitute for cement

The startup raised Rs 12.5 crore in seed funding co-led by IAN Angel Fund and Rainmatter to build its first factory

This capital allows the business to progress from city pilot trials toward large-scale commercial manufacturing over the next two years

Climate-tech business CarbonStrong collected Rs 12.5 crore in seed capital.
The financing round was co-led by IAN Angel Fund and Rainmatter.
Additional participants included Social Alpha, Full Circle Ventures, Momentum Capital, and Spectrum Impact.
The startup will allocate the money toward setting up its inaugural production plant.
Proceeds will also support recruiting staff and running testing procedures on new formulations.
The business aims to shift beyond pilot demonstrations into commercial production.

Global manufacturing of cement contributes more than 8% of worldwide carbon dioxide emissions.
CarbonStrong states its formulation can lower carbon output by as much as 50%.
The material also costs roughly 30% less than standard cement and prolongs concrete lifespan by 10-15 years.

The venture manufactures low-carbon binders using reprocessed industrial waste streams.
Its formulation can substitute for as much as half of standard cement in concrete batches.
The blend works without requiring changes to existing client facilities, machinery, or operating techniques.
Key purchasers include Ready Mix Concrete suppliers alongside makers of pavers and blocks.
The company has executed demonstration work across Bengaluru, Hyderabad, and Chennai.
Plans call for reaching an annual output volume of 100,000 tonnes within two years.

Product: Low-carbon binders made from industrial waste replacing up to 50% of cement in concrete
Customers: Construction companies and concrete manufacturers seeking sustainable alternatives
How it makes money: Manufacturing and selling cement substitute to construction industry
What sets it apart: Upcycles industrial waste from coal and steel sectors without requiring infrastructure changes