What is Propylene Glycol?(PG)
Propylene glycol is a colourless organic liquid. The propylene glycol can be manufactured in different grades. The most controlled grade is called propylene glycol-USP. This is the kind that E-liquid uses.
PG is a fluid that has no odor or color, and is less viscous than VG. In vaping it is used to provide a throat hit. It also carries flavor more effectively than VG.
PG is a thinner e-liquid and because of this, higher PG is recommended in smaller tanks such as the Protank 2-3, evod's, nautilus tanks, T4 Tanks, and others alike. However, when used in sub-ohm tanks it can cause the tank to leak.