Houston-based material science and climatech startup DexMat has closed a $5 million seed round.

The round was led by non sibi ventures, with participation from Governance Partners, Tailwind Futures, BetterWay, Capital Factory and other investors. The company additionally announced that it has secured $3 million of non-dilutive funding.

DexMat plans to use the recent round to commercially scale Galvorn, its carbon-based conductive fiber. The high-performance copper alternative, originally developed at Rice University, is made from carbon nanotube (CNT) fibers, which are less energy- and CO2-intensive to produce.

The company says it will grow its technical and commercial teams and advance pilot-scale production to meet demand from new and existing customers in aerospace, defense and manufacturing industries.

"We’re seeing clear customer pull, particularly in wire and cable applications, as manufacturers look for conductive materials that are less dense, more durable, and resilient at scale,” Bryan Guido Hassin, CEO of DexMat, said in a news release. “This funding allows us to meet near-term demand and expand production capabilities in response to evolving supply-chain constraints."

The recent funding comes after a year of impressive growth. According to the news release, DexMat more than doubled its production and sales of Galvorn in 2025 compared to the previous year.

“We consistently hear the same message from customers: the material performs really well, and they need more of it at a lower cost,” Dmitri Tsentalovich, co-founder and CTO of DexMat, added in the release. “This round supports the production scale-up and cost reductions required to move Galvorn into broader commercial use.”

DexMat raised $3 million in funding in a round led by Shell Ventures in 2023. The company reports a 20-fold increase in capacity since its pre-seed round, along with a 96 percent reduction in production costs.

DexMat's technology was originally developed in the Rice University lab of co-founder Matteo Pasquali, who also serves as director of Rice’s Carbon Hub. According to previous reports, the company was built on over $20 million in non-dilutive funding—including grants from the Air Force Research Laboratory, Air Force Office of Scientific Research, U.S. Department of Energy, NASA, Advanced Functional Fabrics of America and the National Science Foundation—with Rice University included in the list of original investors.