Flexible Pressure Tubing for Cutting Oil?

[tobnpr]

I use dark sulfur cutting oil in a pressurized flush system for chambering rifle barrels.
The clear PVC tubing sold at the big box stores (both reinforced for pressure applications, and the plain stuff) eventually gets hard and brittle from the petroleum.
Cheap enough to replace periodically (which I've been doing) but now I want to find suitable tubing that's compatible with this application.

McMaster lists the semi-clear yellow Tygon as suitable for "intermittent" use with petroleum based products. What the hell does that mean?
Intermittently with other than petroleum based products, or periodic (as opposed to constant) flow? There will obviously always be residue of the oil in the lines even when not in use.

I prefer to have some visibility of flow which the Tygon allows (and it'll handle the 40 psi pressure), is this suitable- or should I just use the Buna-N rubber that's opaque?

 

[RaisedByWolves]

I've been using Tygon for fuel lines in OPE and boat motors for a long time with good results, no idea of why the recommendation is worded the way it is.

Technically its not "rated?" for outboards, but for primer lines and such that are not under pressure I don't see the harm.

I buy mine from the local chainsaw/mower house and they use it the same way.

 

[C-Bag]

Tygon is just high grade silicone tubing that Saint Gobain slapped that name on it and then charges 4x what you can get it without the name. It is pretty much impervious to everything and is even good up to like almost 500f. I now get mine off Amazon.

 

[Pevehouse]

Tygon is just high grade silicone tubing that Saint Gobain slapped that name on it and then charges 4x what you can get it without the name. It is pretty much impervious to everything and is even good up to like almost 500f. I now get mine off Amazon.

Yes sir, I buy mine from Amazon as well. I use mine on oiling systems without any issues at all

 

[yota]

I've been riding dirt bikes most of my life and have tried amazon Tygon substitutes and they always get hard as a rock. never had a problem with Tygon and in reality, it's not a lot of money, at least not the amounts needed for dirt bikes and chain saws.

 

[woodchucker]

Ft

Tygon is just high grade silicone tubing that Saint Gobain slapped that name on it and then charges 4x what you can get it without the name. It is pretty much impervious to everything and is even good up to like almost 500f. I now get mine off Amazon.

I didn't think silicone and gas played well together.

 

[whitmore]

Tygon is commonly vinyl tubing (or used to be); if you want silicone tubing, that brand name isn't a complete specification.
Tygon "fuel and lubricant tubing" includes several variants.
Here's a selection guide...