Space Mushroom is a free, open materials database. Every property shows its unit, the conditions it was measured under, and its source, with the place in the source where the number appears. When two sources disagree, both are shown.

We’re just getting started, and the goal is big: to cover every material humans have discovered, one by one. Today that already includes stainless steels, aluminium, titanium, polymers like PEEK and nylon, rare earths, solders and ceramics. We add more every week.

The platform is free and open, with the data under CC BY 4.0.

Try it: https://spacemushroom.com/materials/

Tell me which materials you’d want next, and if you find a wrong number, I’ll fix it.