Poly what ? !
Polyethylene, Polypropylene, Polycarbonate, Polyvinyl Chloride ...

I guess that you mean Polypropylene, I'd be interested if you meant
polyethylene as I have some damp proof course that may suffice.
I suspect that Polycarbonate would work fine also - I have some that
is 0.75 mm thick and very tough.

What is so hard about typing "rhizome barrier" into a search engine?

Here is a blurb ripped off a dot.com

Many materials have been tried for bamboo containment. Concrete
cracks, metal rusts most plastics age and crack, rubber is too soft.
Polyethelene is the right material but must be thick enough to resist
penetration but flexible enough to handle and install. The American
Bamboo Society web site recommends barrier that "should be at least
0.040 inch thick". We have had customers bring us barrier that is .040
inch thick with a rhizome right through it. Bamboo Giant has
formulated a custom barrier material that is .060 thick, 50% thicker
than that recommended by the ABS. It is UV protected for long life and
has a plasticizer added to make it easier to work with.

Rolls are 148 feet long and weigh 115 lbs.