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I want to close a rectangular vertically mounted pipe with a piece of flat PVC plastic. I will use the pipe for growing herbs on the wall outside my house, so it needs to be non-toxic.

I was thinking of using glue or cement for that. Does anyone know any non-toxic glue or cement to do the job?

Or maybe someone have a mechanical idea without using glue?

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up vote 4 down vote accepted

Gorilla glue makes a non-toxic PVC cement.

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I'm not sure that it's non-toxic. Gorilla shows that it contains NMP, which causes birth defects in California. But, I think that the toxic parts of PVC cement will evaporate enough over the course of a few hours that this is a non-issue, and any PVC primer and cement is safe to use. Note that you will want to use CPVC and not PVC if it will be exposed to UV light (such as sunlight) – Pigrew Mar 2 '13 at 21:24

PVC pipe is not inherently safe for drinking water, even before you cement it. See http://chej.org/2013/09/pvc-pipes-bringing-toxic-lead-to-drinking-water/ and http://water.epa.gov/drink/contaminants/basicinformation/vinyl-chloride.cfm

PVC pipes can leach both lead and vinyl chloride. CPVC pipe adds chlorine (another toxic) to the mix, compared to regular PVC. PVC contaminates other plastics if mixed in during recycling.

All plumbing materials leach something into the water: do your research. The glue is likely not the biggest concern after installation.

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