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Old 04/21/2018, 12:17 PM   #1
Sgt Jonny Cat
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Teflon tape on PVC??

So as I plan my 150 build I have been watching numerous Youtube videos on tank plumbing and I see most people are using Teflon tape on their threaded connections. Is this a good idea? Because I thought the Teflon tape was for brass/metal fittings and using it can put too much stress on the PVC. I'm pretty sure they make a paste for PVC don't' they? Anyone want to chime in? Thanks...

In the process of putting together a 150 gallon mixed reef. Ill keep you posted.

Current Tank Info: 55 Gallon
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Old 04/21/2018, 12:25 PM   #2
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Use teflon paste for PVC. Tape for metal fittings.

PVC threads are tapered so the tape makes them slide easier which means you can actually over tighten and crack a fitting. Paste simple seals the threads and doesn't decrease friction like tape.

Either one will work as long as you only hand tighten PVC. But, to be correct, tape on metal, paste on plastic threads.

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Old 04/21/2018, 12:31 PM   #3
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Teflon tape is made for metal. You won't get a proper seal with metal on metal without the tape. Paste is used for PVC.

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Old 04/21/2018, 03:56 PM   #4
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I’ve used tape on pvc for years without any problem.

Is it a good idea? No.
Can you over tighten a fitting with it? Yup sure can.

You just have to know how much is too much. Paste is the appropriate use.

Quitters never lose.

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Current Tank Info: 75g DT, 30G refugium, 10g chaeto tank, 50g stock tank basement sump
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Old 04/21/2018, 04:09 PM   #5
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You could technically use either and have it work. There is specific tape made for each individual material or the standard white cheap stuff works for most applications. Sometimes stainless is a pita if you don't use the specific tape or paste tho. The reason most people use paste on plastic is because it's easy to over wrap with tape and crack the fitting. Most plastic threaded connections are tapered but there are ones that are not, these are the type (not tapered) I personally tape. Do what your comfortable with and good luck!!

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Old 04/22/2018, 07:53 AM   #6
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Teflon tape is always for metallic threads..
Threaded PVC connections should always be done with a non-hardening thread sealant paste specifically intended for PVC..

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Old 04/22/2018, 10:08 AM   #7
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Originally Posted by mcgyvr View Post
Teflon tape is always for metallic threads..
Threaded PVC connections should always be done with a non-hardening thread sealant paste specifically intended for PVC..
+1, even Teflon paste can be an issue, not just Teflon tape since the Teflon lubricates the joint and makes it very easy to over tighten the connections which can cause the fittings crack. Rectorseal paste has been my choice as a PVC sealant for years.

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