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E-Liquid Selection Principles
Selection should be based on device configuration, airflow type, coil resistance, power range and formulation characteristics. PG/VG ratio influences viscosity, vapour density and wicking behaviour, while sweetener concentration affects residue formation and coil lifespan. Lower viscosity blends (higher PG) are generally suited to mouth-to-lung (MTL) systems, whereas higher VG formulations are designed for sub-ohm and direct-to-lung (DTL) configurations requiring increased vapour output.
In Ireland’s cooler climate conditions, higher VG liquids may become noticeably thicker, requiring slightly longer saturation time between draws to maintain stable coil performance. Understanding these structural factors allows more predictable device compatibility and maintenance planning.
E Liquids
How to choose the correct e-liquid
Selection should be based on device configuration, airflow type, coil resistance and power range. Lower viscosity formulations are generally suited for mouth-to-lung (MTL) systems, while higher VG blends are designed for sub-ohm and direct-to-lung (DTL) configurations where increased vapour density is required.
PG/VG ratio guidance
- 50/50 PG/VG – balanced viscosity for pod systems and standard MTL devices
- 70/30 (PG/VG) – suitable for MTL or restricted DTL setups depending on airflow and coil design
- 70VG+ – higher vapour density blends intended for sub-ohm tanks and DTL configurations
Device & Inhale Style Matrix
| PG/VG Ratio | Inhale Style | Typical Device | Coil Range | Power Range | Coil Friendly |
|---|---|---|---|---|---|
| 50/50 | MTL | Pod systems / MTL tanks | 0.8Ω – 1.8Ω | 10W – 18W | High |
| 70/30 (PG/VG) | MTL / Restricted DTL | Adjustable airflow kits | 0.6Ω – 1.0Ω | 15W – 25W | Medium |
| 70VG+ | DTL | Sub-ohm tanks | 0.15Ω – 0.6Ω | 25W – 70W+ | Medium–Low (high sweetener blends) |
Viscosity Note (Ireland climate): In lower ambient temperatures common in Ireland, higher VG formulations (70VG+) become noticeably thicker. Allow additional wicking time between draws to avoid dry hits in sub-ohm configurations.
Nicotine formats
- Freebase nicotine – commonly available in 0mg to 18mg
- Nicotine salts – commonly available in 5mg to 20mg (where permitted)
Shortfill nicotine calculation example
| Base Volume | Nicotine Added | Final Volume | Approx. Final Strength |
|---|---|---|---|
| 50ml | 1 × 10ml (18mg) | 60ml | ~3mg/ml |
| 100ml | 2 × 10ml (18mg) | 120ml | ~3mg/ml |
Technical FAQ
Pod systems are typically optimised for 50/50 or higher-PG blends due to lower viscosity and improved wicking in compact coil chambers. High-VG formulations are generally used with lower-resistance coils (commonly below 0.6Ω) and higher wattage output in DTL configurations. Gradual darkening may occur due to nicotine oxidation and flavour compound interaction with oxygen. Under the Tobacco Products Directive (TPD), nicotine-containing e-liquids are limited to a maximum strength of 20mg/ml and 10ml bottle size.What PG/VG ratio is best for a pod system?
What coil resistance should I use with 70VG e-liquid?
Why does e-liquid darken over time?
What is the maximum nicotine strength allowed in Ireland?
Vaping Regulations in Ireland
Nicotine-containing e-liquids are restricted to a maximum 10ml bottle size under the European Tobacco Products Directive (TPD). Nicotine strength is limited to 20mg/ml. Retail sale of vaping products in Ireland is restricted to adults aged 18 and over.