Space Forge Heats Orbital Furnace to 1,800°F

A tiny “factory” the size of a microwave just pulled off a big milestone in low Earth orbit: it heated up to extreme temperatures and generated plasma, a key step toward making next-generation semiconductor materials in space.

UK startup Space Forge says it successfully switched on the manufacturing furnace aboard its first satellite, ForgeStar-1, reaching about 1,830°F (1,000°C). The company calls it the first time a commercial in-space manufacturing satellite has created the plasma conditions needed for advanced crystal growth—an achievement that could eventually translate into cleaner, higher-performance materials back on Earth.

A microwave-sized lab, now running in orbit

ForgeStar-1 launched on June 27, 2025, as part of SpaceX’s Transporter-14 rideshare mission. While the spacecraft is small, its ambition is not: Space Forge wants to grow semiconductor crystals in microgravity that are dramatically purer than those produced on the ground—potentially up to 4,000 times purer, according to the company.

That claim hinges on what space does (and doesn’t) do to materials. On Earth, gravity-driven convection—heat moving through the motion of fluids—can introduce imperfections as crystals form. In orbit, with microgravity largely removing that convection, atoms can align more uniformly. The result, at least in theory and increasingly in early demonstrations, is cleaner crystal structures with fewer defects.

Why plasma and 1,800°F matters for semiconductors

In-space manufacturing isn’t just about sending hardware upward; it’s about recreating industrial-grade conditions where the environment itself becomes a tool. Plasma generation and high-temperature control are essential for a range of materials processing tasks, including semiconductor manufacturing and specialty crystal growth.

Space Forge CEO and co-founder Joshua Western described the test as a turning point, arguing it shows the required environment for advanced crystal growth can be produced on a dedicated commercial satellite. If that holds up as the company scales, it could open a new pathway for producing high-value materials in orbit and using them in terrestrial supply chains.

And the applications are easy to picture. Higher-performance semiconductor materials can feed into the tech that powers everyday life—electronics, communications infrastructure, and transport. Western has pointed to uses such as components that support 5G connectivity and modern aviation systems. In other words: better materials could quietly boost a lot of the devices and networks people rely on without ever needing to know where those components were made.

The “burn up” plan—and the real prize: bringing materials home

ForgeStar-1’s mission is designed as a test run, and the satellite is expected to burn up during re-entry. But it wasn’t only about proving the furnace works. Space Forge also used the flight to evaluate a heat shield called Pridwen—technology meant to help future spacecraft survive re-entry so manufactured materials can be returned safely to Earth.

That re-entry and recovery capability is arguably the make-or-break feature for commercial in-space manufacturing. Producing ultra-pure materials in orbit is compelling; delivering them to customers on the ground, reliably and at scale, is what could turn an orbital demo into an actual industry.

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