Is PG different thickness from different vendors?

[pizza2me]

I'm no expert, but I've mixed quite a bit of ejuice. I've gotten all of my PG from <one vendor> prior to this order. I just got 1,000ml PG from <a well respected vendor here> and it's thicker. Almost seems like the thickness of a 50/50 mix.
Is this normal for PG to have different thickness from different vendors?

Or maybe <the first vendor> is thinner than others? Which is fine, I just need to know as too high VG causes my wife some issues.

Thanks.

PM me if you need to know the names. I don't want to possibly give a bad look to either if they are both correct.

 

[MISTer E]

I am new to DIY & have only handled PG from one source. That said, PG does absorb water from the air. Cigar humidors keepers often use it as a humectant. Maybe the thicker stuff is a fresher batch &/or was keep away from moist humid air better while stored. Here is a cigar humidor page that explains more about such properties of PG.
The secret of the correct liquid or the magical effect of the propylene glycol

I would take it from reading that page that if ones PG seems runny, one can remedy that by placing(in some fashiion) the runny PG in a dry humidity condition of less than 70% to release some moisture back into the air? [seems plausible]

 

[pizza2me]

Interesting! Thanks mister! Maybe the new stuff is fresher?

Another thing I noticed. When I poured the new PG in a smaller bottle (250ml) I noticed tiny bubbles throughout (like I normally see only in VG, but not as many)

Do you all normally see this in pure PG? Or is PG as thin as water?

EDIT: Wait... What you are saying is that the most recent PG I recieved (thicker) may have been exposed to more air?

 

[MISTer E]

EDIT: Wait... What you are saying is that the most recent PG I recieved (thicker) may have been exposed to more air?

I think it is most likely just fresher.

It seems according to the humidor link I posted that:

If the air PG is exposed to is: above 70% humidity = PG absorbs water from the air & air below 70% causes it put water back into the air. I fear & suspect that when it gives the water back to the air under 70% it also send some PG along with it. I say that due to the line from the webpage: "propylene glycol forms a thin layer on the surface of the humidifier".

As far as the bubbles forming, I have only a little experience mixing/handling PG & simply do not recollect any bubbling that may have formed whilst pouring. My PG seems a tad thicker than water, but not much more.

 

[Rocketman]

Fresher? as apposed to stale?

I think the best thing to do would be to contact the vendors you have ordered from and talk to them.
PG does absorb water from the air but I doubt 1 or 2% water content would be noticeable without doing some type of viscosity test or weighing for density. (results will seem backwards for density with PG and water ).

Set up some type of viscosity test ( I posted a device that works for me someplace) to check your liquids. Won't tell you much about the chemical content, but would answer your question.

You could expose the PG on a large surface area in a low humidity sealed chamber for a month or two and it would give up some of that water