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Mass Magnetics

USA-made magnetics for robotics and defense.

Mass Magnetics turns recycled rare-earth scrap into high-performance permanent magnets, made in America. The materials we supply are the backbone of electric motors, sensors, speakers, hard drives, and electronics. Our process enables DFARS-compliant magnets for defense, aerospace, and industrial manufacturers who demand domestic supply without compromising on quality. Operations in Greater Boston, MA (Greentown Labs) and Columbus, IN.
Active Founders
Eric Silver
Eric Silver
Founder/CEO
Founder at Mass Magnetics. Worked in pilot cathode production for lithium-sulfur battery chemistries. Now I'm fixing American magnet supply chains.
Matthew Groll
Matthew Groll
Founder/CTO
Co-founder and CTO at Mass Magnetics. Former NASA/Columbia/MIT. Previously worked on thermal systems and guidance/navigation at NASA Johnson Space Center for ISS and Artemis lunar missions. Also previously worked as a Member of Technical Staff at Draper Laboratory. Studied Mechanical Engineering at Columbia, captaining the Formula SAE team and Robotics Club, then earned a Masters in Manufacturing from MIT.
Company Launches
Mass Magnetics: USA-made magnets
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TL:DR; Mass Magnetics makes American magnets in minutes.

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Every electric motor runs on rare-earth magnets. EVs, drones, robots, wind turbines, guided munitions: nearly all of them are dependent on Chinese magnets. On January 1st, 20270, regulation changes will make it illegal to deliver anything that walks, drives, or flies to US Defense if it contains a magnet produced in covered countries like China. The domestic supply chain meant to replace it doesn't exist yet. Mines take a decade to permit, and the ore they pull up leaves radioactive tailings behind, making permitting magnet mining a nightmare.

We’re the founders, Eric Silver and Matthew Groll (left and right in the pic below). We’ve known each other since grade school. Since then, Eric’s built multiple battery pilot production lines and materials science labs in the Midwest for NSF-funded companies. Matthew’s built exquisite aerospace gear including Moon-regolith melters and ultra-precise guidance systems for the world’s foremost labs at NASA, Draper, and MIT. Together we’re making one bet: America's rare-earth problem isn't a mining problem.

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Mass Magnetics’ unfair advantage is sitting in end-of-life electric vehicles, hard drives, and industrial equipment. The team uses AI models and robotics trained on real scrap to sort metallurgy by exact grade and chemistry. Then, a rapid-sintering process takes that reclaimed mass to a finished magnet in 3 minutes, where conventional approaches take over 4 hours. The result is a magnet as strong as anything imported, with no radioactive footprint or bureaucratic permitting, fully compliant for US defense.

If you build robots, drones or motors visit our site and reach out at outreach@massmagnetics.com and get your magnets.

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Mass Magnetics
Founded:2026
Batch:Summer 2026
Team Size:3
Status:
Active
Location:Boston
Primary Partner:Vivian Midha Shen