Digging through Hyperion’s website, the following can be found:
Hyperion’s main facility is currently in the UK, where a supply agreement regarding materials has been made with an operator called LKAB Minerals. In Finland, production volumes are likely small and pilot-like. Based on this, I would consider it probable that material is supplied mainly to the UK, which lowers the competitiveness of Finnish suppliers. I would therefore assume that LKAB is the primary material supplier and that the solution is based on the company’s own technological expertise.
The company’s materials state the following:
“Hyperion’s micro‑factories use 75 % less structural material, and support recycled industrial waste (slag, fly‑ash, tailings) to lower embodied CO₂ by up to 90%.”
These are the same materials that Betolar, in particular, has been working on developing.
Hyperion also appears to have an ongoing project investigating the use of new types of materials:
And my apologies to all Spotify users, the video will appear there a bit later today too! I was editing the video while waiting for my car to be serviced, and the workshop’s Wi-Fi speed wasn’t enough for more than one upload, but it’ll be up shortly! 
