Propylene Glycol referred to as PG is one of the main ingredients in the production of E-Liquid. It makes up part of the liquid that heats up to create the vapour that is produced. PG is also the ingredient that contributes to whats know as 'The Throat Hit'. It is possible to make E-Liquid with 100% PG which will generally give a great throat hit, but will not produce a lot of vapour. People use 100% PG for 'Stealth Vaping' - where vaping is generally not allowed so that not much vapour is produced. Most E-Liquids contain 70%-80% PG and 20-30% VG mix, but there is no hard and fast rule as to the ratios you use.
Our PG is the highest pharmaceutical grade available