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I remember seeing this topic talked about but I have not been able to find the discussion.
I know that PVC (The same PVC that is used in water pipes) will damage and destroy silver. What other materials will damage silver? I want to make a "pipe safe" and burry it. What pipe materials are non reactive with gold, silver, nickel, copper, steel, and gun powder? (The would be in firearms and bladded weapons).

Polyethylene or polypropylene would be good. You just want to avoid anything with chlorine/chloride (also known as bleach).

ABS pipe (Acrylonitrile butadiene styrene) might be good. I normally comes in wide diameters too. You can glue caps on the ends like PVC.

OK cool.

would 90% junk be safe in sched. 80 pvc if the coins are in Coinsafe tubes, taped all the way around, put in food saver bags then put in the tube with desiccant packs ?

Can I vote for lead? Soldered shut to seal, then if times are hard ya got something to melt for bullets.

can you still buy lead pipe?