To put it in simple terms, the priming fluid sets up the PVC cement to do its job properly. The primer acts as a cleaner, removing grime as a PVC cleaner does, and it also softens the surface that it is applied on. PVC pipes are joined together through a change in their chemical composition.
(High) Pressure it likely matters, you want a strong bond. Stormwater/downpipes, probably not.
Not a plumber.
I just did a quick websearch for both these answers, try a deep dive on some Reno forums or similar, find a plumber or chemical expert as to why it’s important.
To put it in simple terms, the priming fluid sets up the PVC cement to do its job properly. The primer acts as a cleaner, removing grime as a PVC cleaner does, and it also softens the surface that it is applied on. PVC pipes are joined together through a change in their chemical composition.
(High) Pressure it likely matters, you want a strong bond. Stormwater/downpipes, probably not.
Not a plumber.
I just did a quick websearch for both these answers, try a deep dive on some Reno forums or similar, find a plumber or chemical expert as to why it’s important.
Another one:
https://redlib.perennialte.ch/r/Plumbing/comments/camh2c/is_pvc_primer_reeeeeally_necessary_when_youre/
Quote:
You may as well just silicone the pipes together.
The primer softens the pipe to prep for the fusion process.
Without primer the glue is essentially just a gap filler.
That oatey cleaner you are talking about is for ABS pipe usually.
ABS doesnt require a primer but is often suggested to use that cleaner prior to application.
A link:
https://www.plumbingsupply.com/the-great-pvc-primer-debate.html
Ah thanks bro. I’ll buy both cement and primer tomorrow. Cheers
The graphs in that link are decent. It’s a significant increase in bonding and if you are under pressure, definitely do it.
And I used to work with a plumber who used primer to set joints on fire to pull them apart again. Another use of primer that isn’t on the label.