Would you fly in a plastic spaceship

But now NASA scientists have invented a groundbreaking, polyethylene-based material called RXF1 that's even stronger and lighter than aluminum. "This new material is a first in the sense that it combines superior structural properties with superior shielding properties," says Nasser Barghouty, Project Scientist for NASA's Space Radiation Shielding Project at the Marshall Space Flight Center.

Sure, why not ? we fly in aluminium which is a light and soft designer metal, we have even flown in magnesium aircraft in WW2, so why not in a high tech, superlative, well designed plastic ?

You obviously live in 19th century.

Why wouldn't you fly in it, if it's stronger than aluminum?
Don't you know what kind of modern materials are being created every day?

I wear a bulletproof vest made from plastic every workday. If this RXF1 passes safety tests, I would have no reason not to trust it based solely on the fact that it is a plastic.