Shortfill E-Liquids Explained: What They Are, How to Mix Nic Shots and Which Brands Lead in Ireland

Shortfill e-liquids occupy a distinctive and practically important niche in the Irish vaping market, yet they remain one of the most frequently misunderstood product formats — particularly for vapers who began with disposable vapes or pre-filled pods before transitioning to open-tank systems. Understanding the shortfill format, why it exists, how to use it correctly, and which brands currently lead the Irish market turns what looks like a confusing label format into one of the best-value options in the entire liquid category.

Why Shortfills Exist: The TPD Origin

Shortfill liquids emerged directly from the EU Tobacco Products Directive (TPD) and its 2016 implementation, which restricts nicotine-containing e-liquids to bottles of 10 ml or less and a maximum concentration of 20 mg/ml. The shortfill was the industry’s creative response: sell a large-format bottle of nicotine-free liquid, leaving unfilled space at the top, then allow the consumer to add a small “nic shot” — a 10 ml bottle of concentrated freebase nicotine — to create their desired final concentration. Neither component individually violates TPD requirements; the blended result is what the user actually vapes.

This regulatory structure has become entirely normalised. Today, shortfills account for a significant proportion of the premium e-liquid market in Ireland and the UK, and every specialist vape retailer stocks both shortfill bases and nic shots as standard inventory. The format opened up a premium, large-volume liquid market that the 10 ml restriction would otherwise have made impractical, and it created a generation of vapers comfortable with mixing their own liquid concentrations at home.

How the Mathematics Works

The most common shortfill format is 50 ml of liquid in a 60 ml bottle, leaving 10 ml of headspace. Adding one 10 ml nic shot at 18 mg/ml to this bottle creates a 60 ml blend with a final nicotine concentration of approximately 3 mg/ml freebase. A 100 ml shortfill in a 120 ml bottle requires two nic shots to achieve the same concentration. Using a 20 mg/ml nic shot rather than 18 mg/ml in the standard format achieves approximately 3.3 mg/ml.

For users who want a higher final concentration — such as 6 mg/ml — specialist double-strength nic shots at 36 mg/ml are available in some markets, though these fall outside standard TPD packaging formats and require specific awareness of what you are adding. Most shortfill brands provide a mixing guide on their website and packaging; these should be followed explicitly rather than estimating ratios independently, since even small errors in a 60 ml volume produce noticeable concentration differences.

Nic Shot Types: Freebase vs Salt Nic Shots

Nic shots are available in two nicotine formats. Freebase nic shots are the standard; added to a high-VG shortfill base, they produce a noticeable throat hit at 3 mg/ml that suits DTL sub-ohm use. Salt nic shots use benzoic acid chemistry to produce a smoother throat hit at equivalent concentrations. Salt nic shots are increasingly available alongside freebase versions and suit vapers transitioning from pod systems to open tanks who want a smoother low-concentration experience without the freebase throat hit.

Important: shortfills are primarily designed for sub-ohm and DTL tank use. A 3 mg/ml high-VG shortfill added to a pod system will often cause dry hits due to viscosity, and will underdeliver nicotine for users accustomed to 20 mg/ml nic salt pods. Match the liquid format to the device type.

Leading Shortfill Brands in Ireland

• Dinner Lady: Among the most awarded shortfill producers globally. Lemon Tart remains one of the most consistently reviewed e-liquids in any format; the tobacco range is among the most accurate for former cigarette smokers making the transition to open tank use.
• Bar Series (Bar Juice 5000): Specifically designed to replicate popular disposable vape flavour profiles in a reusable-tank format. Extremely popular among vapers transitioning from disposables who want familiar flavours in a more economical open system.
• Riot Squad and RSQD: Premium UK brand with complex layered fruit and dessert profiles. The RSQD sub-range uses nic salt formulation in shortfill format for smoother low-concentration delivery.
• IVG (I Vape Great): Applies the same flavour formulation rigour as its pod consumables and disposable lines to a shortfill range that parallels the IVG 2400 pod flavour profiles closely.
• Nasty Juice: Malaysian brand with strong tropical fruit formulation heritage and wide availability in Irish specialist retailers.

Steeping: The Step Most New Shortfill Users Skip

Steeping is the practice of leaving a newly mixed shortfill sealed — cap on, bottle upright — for a period before first use. During steeping, the flavour compounds in the base liquid integrate with the nicotine from the nic shot, and oxidation of certain flavour molecules (particularly vanillin-based compounds in dessert profiles) produces the “rounded” character that differentiates a well-steeped liquid from a freshly mixed one. Steep times vary by liquid type: fruit profiles benefit from twenty-four to forty-eight hours; dessert and tobacco profiles from three to seven days; custard and cream profiles sometimes from two to four weeks for full flavour development.

Not all liquids require steeping — many are formulated to be vaped immediately — but for premium shortfills from brands that recommend steeping, following the guidance consistently produces noticeably better results than vaping straight from the mixed bottle. The practical approach is to mix a shortfill, let it steep while working through the remainder of a previous liquid, and switch to the freshly steeped product when it is ready.

Storage and Shelf Life

Unmixed shortfill liquid has a shelf life of one to two years from production date when stored correctly: in a cool, dark location away from direct sunlight and temperature extremes. Heat and UV light both accelerate oxidation and Maillard reactions that cause liquid to darken and flavour to degrade. Once a nic shot is added, the blended product should be used within six months for optimal flavour quality. Never store e-liquid in a vehicle’s glove compartment or dashboard area — the temperature extremes in a parked car in both Irish summer and winter conditions exceed the ideal storage range and can significantly degrade the liquid within days of repeated exposure.