Forget sunscreen - I can resist UV radiation all on my own! What am I?

I’m cheap, lightweight, and water resistant, but I’m best suited playing a supporting role to my friends like ABS! What am I?

My semi-crystalline structure means that, unlike the average university student, I’m very resistant to fatigue! What am I?

I’m extremely stiff and strong, and will resist warping with every fiber of my being - but make sure your nozzle can handle me!

Glossy, smooth, and sleek, I would make a great water bottle - what am I?