A Boston startup is betting that 60-second magnet production can capture a slice of the Pentagon's procurement budget before new supply-chain restrictions lock out Chinese material for good.
Mass Magnetics announced Tuesday it has opened preorders for recycled rare-earth magnets aimed at defense contractors and robotics manufacturers, positioning itself ahead of stricter Department of Defense acquisition rules set to take effect at the start of next year. The three-person company, which recently completed Y Combinator's summer accelerator program, says its magnets qualify for a regulatory exemption because the material is both recycled and processed entirely in the United States.
The timing matters. Under Defense Federal Acquisition Regulation Supplement 252.225-7052, updated this past May, the Pentagon will prohibit contractors from sourcing magnets "mined, refined, separated, melted, or produced" in China, Russia, Iran, or North Korea beginning January 1. The company claims the recycled-material pathway offers a workaround due to a regulatory exemption for recycled materials, one that Mass Magnetics is exploiting with what it calls a proprietary sintering process.
Where conventional furnaces take hours to densify neodymium-iron-boron powder into finished magnets, the startup says it can do the job in as little as 3 minutes. The company claims heating rates that reach 3,000 Kelvin per minute, producing grades up to N52 while keeping all milling and sintering operations domestic. "Sintered in seconds," reads the company's website. "Our proprietary process takes recycled powder to a fully densified bulk in as little as 60 seconds."
Feedstock comes from end-of-life electric vehicles, hard-disk drives, industrial equipment, and stamping scrap. Mass Magnetics says it uses AI-driven computer vision to sort magnets by precise chemistry and grade, a detail the company highlighted in a Y Combinator launch post published in mid-August. "Mass Magnetics' unfair advantage is sitting in end-of-life electric vehicles, hard drives, and industrial equipment," the founders wrote at the time.
The team operates out of Greentown Labs in Somerville, Massachusetts, and a makerspace in Columbus, Indiana. Co-founder and CEO Eric Silver Scholem previously built battery pilot lines and materials science labs in the Midwest for NSF-funded ventures, according to the company's accelerator profile. His co-founder, CTO Matthew Groll, spent time at NASA Johnson Space Center working on thermal systems and navigation controls for the International Space Station and Artemis missions. Groll studied mechanical engineering at Columbia and manufacturing at MIT.
Mass Magnetics is entering a domestic rare-earth magnet market that has grown noticeably more crowded over the past year. MP Materials selected a site in Northlake, Texas, in February for a facility targeting 10,000 tonnes of annual capacity, later launching "Project Swarm" in July to let drone and motor manufacturers reserve production slots. eVAC Magnetics shipped its first U.S.-made neodymium magnets from Sumter, South Carolina, in December 2025 and held an opening ceremony this summer for a plant scaling to 2,000 tonnes annually. USA Rare Earth commissioned a commercial magnet line in Stillwater, Oklahoma, in late March. HyProMag USA announced plans in July for a Dallas–Fort Worth recycling hub with initial capacity around 400 tonnes per year and a full build-out target of 1,526 tonnes.
Against that backdrop, Mass Magnetics' pitch hinges less on scale than on regulatory compliance and speed. The company expects to deliver preordered magnets by year-end. It also sells DFARS-compliant rare-earth and heavy rare-earth alloys to domestic metallurgists while ramping sintering capacity, according to its website.
The startup declined to disclose funding, valuation, manufacturing throughput, or customer names. Whether 60-second sintering proves commercially viable at volume remains an open question, but the regulatory tailwind is real. Defense contractors face a hard deadline, and domestic alternatives are still scarce enough that a small operation with the right certifications could carve out a niche. For now, Mass Magnetics is making the ask: preorder now, get magnets by December, and check the DFARS box before the rules change.
