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PE and PP are also the cheapest and most common plastics.

They are NOT very stiff, tho.

HDPE is very stiff, MDPE is kinda stiff and LDPE is flimsy. Same monomer just cross linked differently with a different production process. Plastic is chemistry magic.

It's just carbon and hydrogen chains. How complex can it be? Surely not so complex to require its own field.

/s

For those unaware of the joke, Organic Chemistry is quite complex. Hydrogen+Carbon can make plastic or Gasoline depending on the details of how it chains.

I’m aware, but HDPE is less stiff than other commodity plastics like ABS or PLA.

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