This link shows some of the different types and applications.

http://rectorseal.com/pipe-thread-sealant-chart/
 
I don't believe it's color coded but
do be aware there are many different
types, some say for different material
pipe, up to certain diameter etc. I
will say this I learned years ago good
Teflon tape is well worth the money
compared to the cheap stuff. I use a
lot of plastic threaded fittings in my
maple syrup operation and years ago I
always used the usual cheap tape from
home depot etc. Plenty of leaks that
required more tightening, sometimes
break a fitting before it was tight
enough. Then one time got Teflon tape
from McMaster Carr just because I was
buying other stuff at the same time, I
scoffed at the 4 or 5 dollar price
instead of a buck a roll. Well I
suddenly realized good Teflon doesn't
shred like cheap stuff, it seals way
easier barely need more than hand
tight on many plastic fittings. Way
less issues never touched discount
Teflon again.
 
That's kinda what I figured it was,but I can't say that I know for sure. I know Dad got a job condemned by an inspector one time when he ran a piece of white PVC under a slab of concrete and ran electrical wire through it. The inspector told him it had to be gray PVC for electric. I figured the pipe dope had some kind of color code to it too.
 

I realize that the colors are for different applications, but many years ago one color fit all. I was just wondering how/why that came about?
 
(quoted from post at 19:35:57 01/22/20) I don't believe it's color coded but
do be aware there are many different
types, some say for different material
pipe, up to certain diameter etc. I
will say this I learned years ago good
Teflon tape is well worth the money
compared to the cheap stuff. I use a
lot of plastic threaded fittings in my
maple syrup operation and years ago I
always used the usual cheap tape from
home depot etc. Plenty of leaks that
required more tightening, sometimes
break a fitting before it was tight
enough. Then one time got Teflon tape
from McMaster Carr just because I was
buying other stuff at the same time, I
scoffed at the 4 or 5 dollar price
instead of a buck a roll. Well I
suddenly realized good Teflon doesn't
shred like cheap stuff, it seals way
easier barely need more than hand
tight on many plastic fittings. Way
less issues never touched discount
Teflon again.

From what I've read on the internet, Teflon tape is not meant as a sealant. What it does is (with it's slippery qualities) allow the pipe connections to be turned tighter than without the tape.
 
as some one else said by the best tape going. I always buy the tape that says for gas, natural propane. It never fails to seal. Also I buy the pipe dope that is for the same uses. It also never fails to seal. Cost is reasonable for the amount I use. I am not at pipe connections every day of the week; maybe once every few months.
Wm.
 
There is an ?old school? plumber in our area that uses both, dope and tape. Tape fills it in and dope allowed it to come loose next time.
By the way, he says there is a difference between a leak and a seep. The minerals in the water will eventually seal a seep.
 

A Plumber once told me that on most very large construction jobs there will always be several leaks when tested. And that on one job it had been specified that tape and then dope on top of the tape, be used on every threaded joint.
He said on that job there had been only a couple of leaks. So after seeing that he always used tape and dope.


Dusty
 

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