Pharmaceutical grade PG, best possible
PG (propylene glycol) carries flavour very well. Almost as thin as water, it ensures your coils can absorb enough liquid. The other job PG does is provides the 'hit' that a smoker is generally looking for.
Most DIY vapers use a mixture of PG and VG to create the perfect, flavoursome vape liquid with just the right amount of hit.
VG40 / 60PG - Strong throat hit, thin liquid. Best for pens and pods
VG50 / 50PG - Fairly strong throat hit, medium consistency. Best for pods
VG60 / 40PG - Light throat hit in pods, strong hit in mods. This is the thickest consistency you would run in a pod and thinnest you would run in a mod
VG70 / 30PG - Medium throat hit, medium consistency. Only use in mods. Flavour is carried well. Good clouds
VG80 / 20PG - Light throat hit, thick consistency. Only use in bigger mods. Flavour is beginning to be lost. Heavy clouds
VG90 / 10PG - Light throat hit, very thick consistency. Mainly used for dripping. Flavour is dropping but clouds are BIG
VG100 / 0PG - Very light throat hit, extremely thick consistency. Used for dripping. Lacking flavour but clouds are MASSIVE