Pipe sealant

[Jkcoon82]

Hello I am building an RO system this winter and wondering if anyone uses any thread sealant or teflon tape on PVC threads?

Thank you

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[minehart gap]

Ray Gingrich uses some for bluish paste. Not sure if it is thread sealant or antisease but my son (in the plumbing trade) tells me that it is food grade. I can't remember if he said thread sealant or antisease

[maple flats]

What parts are PVC? PVC will not hold up to most RO pressures if you are going up where other do on pressure. It will take drain and low pressure components. Yes, use teflon tape, but be careful tightening. The teflon gives you the impression it is not screwed in very tight but if joining anything into PVC female parts you can break the PVC by tightening too much and splitting the PVC.

[Zucker Lager]

I agree with Flats in industry we would never use pipe dope that was a petroleum base on PVC. after time it will soften the joint. IF it is the label will say "Safe for PVC". So I usually used Teflon tape. There are some types of plastic pipe that will take more pressure than the typical 150 working pressure at room temperature but one thing I found is plastic pipe in general doesn't like vibration and fittings can stress crack. Jay

[Ridge Creek]

Oatey Great White pipe dope for use on abs, nylon etc. fittings. Reworking my RO as well and after much research settled on this product. While I usually support the use of Teflon tape, my reading on plumbing sites suggests that non hardening pipe dope is “pushed” into the threads essentially plugging the treads. Suggested to hand tighten then no more than 1 1/2 turns. How this helps (and works!).