Need Help Best plastic substrate for exterior osha signs

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I have an industrial company that wants plastic signs, they will be used outdoors, but they have specified plastic.
I would like to print them on our UV printer, I know there is PVC, but worried about durability.
What is everyone using for this type of application?

 

[Zendavor Signs]

We use 3mm ACM. Yes, contractors will spec plastic or fiberglass or other weird materials. Just tell your customer ACM (or whatever your preferred material) is what it is going to be.

 

[Billct2]

I also would suggest ACM, but if the insist on plastic I would use polycarbonate. We did a large job for an industrial client that wanted No Trespassing signs that weren't metal, because scrappers stole the metal ones. We screened white lexan and they have been up for at least 10 years.

 

[FireSprint.com]

Polycarbonate or Hdpe. We offer hdpe printing if you don't stock it.