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PG/VG base liquids are the foundation of DIY vape juice, allowing adult users in Ireland to control viscosity, vapour production and overall device compatibility. By selecting the correct ratio of propylene glycol (PG) and vegetable glycerine (VG), users can tailor their e-liquid for pod systems, MTL kits or sub-ohm devices.
Unlike finished e-liquids, base liquids contain no flavour. Their role is purely technical — to define how the liquid behaves inside the device. Correct ratio selection is essential for proper wicking, coil stability and consistent performance.
Bases
PG/VG Base Liquids – Viscosity Control, Wicking Behaviour and Device Matching in Ireland
Key Takeaways:
- PG/VG ratio determines how a DIY e-liquid behaves in a device.
- PG improves wicking speed and throat hit, while VG increases vapour density.
- 50/50 is the most versatile option for pod systems.
- Higher VG ratios require compatible coils and higher power devices.
Definition: PG/VG base liquids are unflavoured carriers used in DIY vape juice to control viscosity, vapour production and compatibility with refillable vape devices.
In DIY mixing, base liquid is not just a filler — it is the main performance driver. The ratio between PG and VG directly affects how the liquid flows through the coil, how it vaporises and how stable it remains during use. For adult users in Ireland, selecting the correct base is one of the most important steps in building a reliable DIY setup.
Understanding PG vs VG Behaviour
- PG (Propylene Glycol): thinner liquid, faster wicking, stronger throat sensation
- VG (Vegetable Glycerine): thicker liquid, smoother inhale, higher vapour production
Balancing these two components is essential. Too much PG can make a liquid too thin for some setups, while too much VG can slow wicking and lead to dry hits in smaller devices.
Technical Specification Matrix – Base Ratio Guide
| Base Type | VG/PG Ratio | Best Devices | Coil Range | Behaviour |
|---|---|---|---|---|
| Balanced Base | 50% VG / 50% PG | Pods / MTL | 0.8Ω – 1.2Ω | Stable wicking, balanced vapour and flavour |
| High PG Base | 30% VG / 70% PG | MTL Devices | 1.0Ω – 1.8Ω | Fast wicking, stronger throat hit |
| High VG Base | 70% VG / 30% PG | Sub-ohm Devices | 0.15Ω – 0.6Ω | Thicker liquid, higher vapour output |
How Base Ratio Affects Device Performance
The wrong base ratio is one of the most common causes of poor performance in DIY setups. A liquid that is too thick may not wick fast enough, while a liquid that is too thin may cause leaking or reduced vapour density. Matching the base to the device ensures stable saturation, consistent vapour production and longer coil usability.
Temperature and Climate Considerations (Ireland)
In cooler Irish conditions, higher VG liquids become even thicker. This can slow down wicking in pod systems or MTL tanks. For that reason, many users prefer balanced or slightly higher-PG mixes for everyday use, especially during colder months.
Price & Value Context – Ireland (2026)
With e-liquid taxation affecting overall costs in Ireland, base liquids play a key role in controlling long-term expenses. Buying base separately allows users to produce larger volumes of DIY liquid at a lower cost per millilitre compared to pre-made products.
- Lower cost per finished e-liquid volume
- More flexibility in adjusting ratios
- Reduced dependency on fixed retail formats
- Better long-term efficiency when combined with concentrates
Regulatory Context – Ireland
- Intended for adults aged 18+ only
- Nicotine must be added separately in TPD-compliant format where applicable
- Base liquids are typically sold without nicotine
- All DIY mixing should follow safe handling practices
This content is informational and focuses on base liquid behaviour, viscosity control and device compatibility in the Irish market.
FAQ – PG/VG Base Liquids
It is an unflavoured liquid used in DIY mixing to control viscosity, vapour production and compatibility with vape devices. 50% VG / 50% PG is usually the most stable and practical option for refillable pod devices. It is not recommended in most cases, as thicker liquid can cause slow wicking and inconsistent performance. Vegetable glycerine has higher viscosity, which makes it produce more vapour but flow more slowly through the coil.What is PG/VG base liquid?
What ratio is best for pod systems?
Can I use high VG base in pods?
Why does VG feel thicker than PG?
Last Updated: March 2026
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