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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.