Comparisons

PG/VG ratio: which liquid fits technically?

PG and VG are the main carriers in many liquids. Their ratio affects viscosity, flavour delivery and aerosol volume.

Editorial status: Aug 7, 202618+

More PG

PG is thinner. Higher-PG mixtures are commonly used in smaller MTL and pod systems when the manufacturer permits it.

More VG

VG is thicker and generally produces more aerosol. High-VG liquids require a coil and liquid-feed system designed for greater viscosity.

Choosing safely

Device instructions and coil-manufacturer guidance take precedence over general recommendations. Unsuitable viscosity can contribute to poor wicking or leaks.

Note: This content is for general information and does not replace medical or legal advice.

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Related terms

Liquids & ingredients

Propylene glycol (PG)

Propylene glycol, or PG, is a relatively thin carrier used in many e-liquids. It carries flavours effectively and affects the mixture's viscosity and draw sensation.

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Liquids & ingredients

Vegetable glycerine (VG)

Vegetable glycerine, or VG, is a comparatively viscous e-liquid carrier. A higher VG share generally increases aerosol volume but requires a suitable liquid-feed system.

Open term

Liquids & ingredients

The PG/VG ratio states the relative proportions of propylene glycol and glycerine in an e-liquid, usually as two percentages. It affects viscosity, flavour transport, aerosol formation and feeding; the order used on the label must be checked.

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Liquids & ingredients

Viscosity

Liquid viscosity describes resistance to flow: high viscosity means thick flow and low viscosity means freer flow. PG/VG ratio and temperature strongly affect it; in an atomizer it helps determine how quickly the wick is resupplied.

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Use & vaping styles

MTL (mouth to lung)

MTL means mouth to lung: aerosol is drawn into the mouth first and then inhaled into the lungs. It typically uses a tighter draw, higher resistance and lower power.

Open term

Use & vaping styles

DTL (direct to lung)

DTL means direct to lung: aerosol is inhaled directly in an open draw. It commonly uses airier atomizers, lower resistance and higher power.

Open term