What is mpolyco?
A free toolkit for understanding and working with the materials that engineers build from — plastics, composites and metals — and the mechanics behind them. It works fully offline, it teaches from the very basics, and every number it shows you comes with the source it came from.
In plain words
Say you want to know how strong a plastic is, which one to 3D print in, or how a carbon-fibre part carries load. Most of the web gives you three different numbers and no idea which to believe. mpolyco gives you one number, and shows you the book or datasheet it came from — and lets you compute with it.
You can use it as a reference (look up a material, a formula, an element), as a calculator (real engineering maths, done on your device), or as a place to learn — starting from nothing and building up. No account, no ads, and it collects nothing about you.
What's inside
Ten areas — tap any one to open it.
Materials →
44 plastics, fibres and composites — every property with the source it came from.
Calculators →
Do real engineering maths on the spot — mix materials, stack a laminate, size a beam.
Simulations →
Watch how materials behave — stretch, creep, fatigue, heat — as interactive graphs.
3D printing →
The whole field from the basics up: the machines, the materials and how to design for it.
Make →
Follow a part from an idea to a finished spec: pick a material, pick a process, design it.
Learn →
38 plain-language articles, plus a guided path from the very start.
Basics →
The physics, chemistry and maths underneath, explained from scratch.
Elements →
The periodic table, with what each element means for materials.
Handbook →
The classic engineering formulas, in one searchable reference.
Library →
Where to read more — open textbooks, courses and papers.
Who it's for
Curious beginners and students — start at zero; the Basics and the guided path assume no prior knowledge and explain every symbol. Practising engineers — trustworthy, cited data and validated tools you can actually design with.
How to get around
- New here? Go to Start here — it points you the right way in one question.
- Want to learn in order? The guided path runs from ground zero to engineer, one lesson at a time.
- Looking for something specific? Use the search box in the top bar — it covers materials, articles, tools and elements.
- Just exploring? Every area is one tap from the top navigation, and areas link to each other where they connect.
Who makes it
mpolyco is built, maintained and owned by Mustafa Mohammad — an independent, self-funded project rather than a company or a team. That is deliberate: it is free, it carries no ads and no accounts, it collects nothing about you, and nobody is paying to have a material or a method appear here.
If you spot a number that looks wrong, or a source that should be cited better, that feedback is genuinely welcome — accuracy is the whole point. Get in touch via the support page.
Why you can trust the numbers
Every material property carries its source (a handbook, datasheet or paper), and every calculator and simulation is tested against known reference values — you can see the checks pass. It runs offline, and it collects nothing. See the sources or read the privacy note.
Ready? Start here, jump into the learning path, or browse the materials database. There's a free app for iPhone, iPad and Mac too.