Posted February 20, 2018 by Daniel Archibald-Jones in Information & Articles

What’s The Difference Between Propylene Glycol & Vegetable Glycerin?

Both Propylene Glycol (PG) and Vegetable Glycerin (VG) are key components in making e liquids, alongside nicotine, flavourings and water. These five components are all it takes to make that delicious e liquid that chances are you may be enjoying right now!

However it’s pretty common for people to be wary of chemicals that they take into their body, so here we’ll take a quick run through of what PG and VG are and the role they play in delivering your vape.

Propylene Glycol

E liquids that contain a higher quantity of PG are by far the most popular on the market, as thanks to their lower viscosity they are much easier to use when refilling cartridges and suchlike. PG also has a lower density that helps lessen the amount of residual build up within the components, while also reaching temperature very quickly. In a practical sense, this makes the e liquid able to deliver ‘on the spot’ and carry flavour over with intensity and speed.

Vegetable Gycerin

VG may be best though of as PGs chubbier, slower but much more mellow distant cousin. It has a natural sweetness that can accentuate flavour in some (but not all) cases, but thanks to it’s density can provide much deeper, thicker and lingering clouds of vapour that some users prefer. This makes them popular within sub-ohm and similar cloud based styles, but also requires a higher degree of maintenance in order to stop devices getting choked up.


In recent years many e liquid manufacturers have come around to the practical benefits of blending elements of both PG and VG into their products. It’s pretty common now for decent e liquids to be around an 80/20 PG/VG blend, but the growing popularity in sub vaping has seen a market develop for 70/30 and even higher concentrations such as 100% VG E Juices.

Both of these ingredients are widely used with food processing and have been so for many decades. As such they are considered to be completely safe and 100% non toxic.