An odd question about corcell foam

Good day, I need some help with a project.

I have some left over foam, A 1200 corcell Id like to use it for a planter box.

My question is can bare foam be used, is it safe? The foam will always have moist soil on it.

Weird question I know, thanks.

 

I don't believe it will be very stable in sunlight. I doubt very much it would work without some paint that has uv inhibitors.

 

Yes thanks, I should have said its for the bottom of a SIP container. Sub irrigated planter. So no sunlight will hit it.

 

It won't do well with shovels or even hand tools hitting it. But for personal use; you'd understand its weakness there. Otherwise a layer of glass would toughen it up a lot

 

My question is more about the foam being safe for roots as these are editable plants,anything to be worried about as far a chemicals leeching etc.
Googling Styrene acrylonitrile just spins me in circles lol.

 

Well, wikipedia has a good blurb.

It is considered food safe for containers, but long term studies showed that acrylonite can migrate and is carcinogous. Not sure I got the verbage correct.

I'd be inclined to find something inert to place inside it, or change the soils every season..

 

Perhaps a coat of epoxy over may help?
How long would I have to wait for the epoxy to fully cure?

 

It’s one of those deals you know I’ve had this piece laying around my garage for years. Finally find a use for it since it’s fairly strong at 12mm thick. I’ve cut it already to fit. It’s about 24”x 15”.

 

Epoxy would work most likely. If san core eats epoxy; we are all in trouble with our epoxy boats.

Just 24 hours is enough. It'll finish curing over next 7 days long before anything else happens.