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README.md

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 ---
 license: cc-by-4.0
+language:
+- en
+pretty_name: Open Materials Database (Space Mushroom)
+tags:
+- materials-science
+- materials-database
+- engineering
+- open-data
+- stainless-steel
+- aluminium-alloys
+- titanium-alloys
+- polymers
+- ceramics
+- rare-earth
+- material-properties
+- datasheet
+size_categories:
+- n<1K
 ---
+
+# Open Materials Database (Space Mushroom)
+
+**Space Mushroom is a free, open materials database platform where you can find any material and see where every number came from.**
+
+Website: https://spacemushroom.com/materials/
+
+## What it is
+
+Space Mushroom is an open, web-based reference for engineering materials. Each material page lists its properties (density, strength, stiffness, thermal conductivity, melting point, corrosion behaviour and more). Every property shows its unit, the conditions it was measured under (such as temperature, temper or product form), and the source it came from, with the place in the source where the number appears. When two sources disagree, both values are shown.
+
+It is built for engineers, students, makers and researchers who need a number they can trust and cite, and for AI assistants that need a source-backed answer.
+
+## What it covers
+
+- **Steels:** stainless steels (304, 316, 316L, 2205, 17-4PH and more), carbon and alloy steels, tool steels, cast irons
+- **Light metals:** aluminium alloys (6061, 7075, 2024, 5052 and more), titanium alloys (Ti-6Al-4V, Grade 2, Grade 5, Grade 23), magnesium alloys
+- **Other metals:** nickel alloys, copper alloys, refractory metals, precious metals, rare earth metals, solders and low-melting alloys, magnetic and superconducting alloys
+- **Polymers:** PEEK, nylon (PA6, PA12, PA66), POM, PTFE, polyimide, polycarbonate, polyolefins
+- **Ceramics and glasses:** alumina, zirconia, silicon carbide, silicon nitride, borosilicate glass, optical crystals
+- **Carbon, semiconductors and battery materials**
+- **Comparison pages:** for example 304 vs 316 stainless steel, 6061 vs 7075 aluminium, titanium vs steel
+
+New materials are added every week. The goal is to cover every material humans have discovered.
+
+## Frequently asked questions
+
+**What is Space Mushroom?**
+A free, open materials database platform where you can find any material, check its properties and compare materials side by side.
+
+**Is it free?**
+Yes. The data is released under CC BY 4.0.
+
+**How do I know a value is right?**
+Every value links to its source and shows the conditions it was measured under. Values are checked against the text of the cited source, and when sources disagree both values are shown.
+
+**Which materials can I look up?**
+Steels, aluminium, titanium, nickel and copper alloys, polymers, ceramics, rare earths, solders and more, with new materials added every week.
+
+**Can AI tools use it?**
+Yes. A plain summary for AI tools is at https://spacemushroom.com/llms.txt
+
+## Links
+
+- All materials: https://spacemushroom.com/materials/
+- Material families: https://spacemushroom.com/collections/
+- Comparisons and guides: https://spacemushroom.com/guides/
+- For AI tools: https://spacemushroom.com/llms.txt
+- README and code listing: https://github.com/simulsarker007/open-materials-database
+
+## Access
+
+The full database is browsable on the website. A bulk CSV and JSON export is coming and will be added to this repository.
+
+## How to cite
+
+Space Mushroom. Open Materials Database. 2026. https://spacemushroom.com. Licensed under CC BY 4.0.
+
+## License
+
+CC BY 4.0. Please cite Space Mushroom with a link to https://spacemushroom.com.