Open a catalogue of eyelash extensions for the first time and you face dozens of curls, thicknesses and densities with no hint of where to start. The type comes down to three things: the state of the client’s natural lashes, the look they want and your skill level. This guide covers the four core types in practical terms: thickness, ratio and the skill each one demands.
The Four Core Types
Classic
Classic is one extension on one natural lash, a 1:1 ratio and the natural starting point for any beginner. Heavier diameters such as 0.18 to 0.20 only suit strong natural lashes.
Hybrid
Hybrid blends classic lashes and volume fans, usually a 50/50 split. That ratio has to be deliberate, or the set looks uneven.
Volume
Volume places a fan of several ultra-fine extensions, 2D to 6D, on one natural lash. Fan control is critical because the wrong diameter or fan size overloads the lash.
Mega volume
Mega volume uses large fans, 10D and beyond, of ultra-fine extensions. It is not for thin or weakened lashes and it demands precise mapping (planning the lash design) and careful weight control.
| Type | Extensions per natural lash | Thickness, mm | Effect | Skill level | Time per set |
|---|---|---|---|---|---|
| Classic | 1:1 | 0.12-0.15 | Natural / mascara | Beginner | 1.5-2 hrs |
| Hybrid | 50/50 classic + fans | 0.05-0.07 + 0.12-0.15 | Textured / wispy | Intermediate | 2-2.5 hrs |
| Volume | 2D-6D fan | 0.05-0.07 | Full / fluffy | Intermediate | 2.5-3 hrs |
| Mega volume | 10D-16D+ fan | 0.03-0.05 | High density / glossy | Advanced | 3+ hrs |
Curl and Thickness: Reading the Label
Curl sets how much lift a lash has. The basic run of letters:
- B: a soft, barely there lift for straight or downward lashes.
- C: the workhorse, a natural lift for most eyes and the standard for classic and volume.
- CC: a stronger lift between C and D, good for volume and hybrid.
- D: maximum, doll-like lift for dramatic sets.
- L: a flat base with a sharp lift for hooded eyes and monolids and it improves the bond.
Thickness ties directly to type: classic runs 0.10 to 0.15 mm, volume and mega volume 0.03 to 0.07 mm. The thinner the extension, the more of them fit into a fan and the lighter the load on each natural lash.
Weight and the Lash Growth Cycle
Most people carry 85 to 150 natural lashes per eye and each runs through a three-phase cycle. In anagen (growth, 30 to 45 days) the lash sits firmly in the follicle, the best state for an extension. It stops growing in catagen (10 to 20 days) and by telogen (resting, up to 100 days) it is ready to shed, so an extension will not hold for long.
A natural lash has to carry the extension without being overloaded. On a fine lash, a light fan of a few 0.05 extensions spreads the load more evenly than one heavy 0.20 classic.
Overloading, whether from too thick a diameter or too large a fan on a weak lash, leads to breakage and poor retention.
Retention: What the Tech Controls
Retention is how long a set lasts before an infill (a top-up): classic gets refreshed every 3 to 4 weeks, volume and mega volume every 2 to 3. From the tech’s side, several factors drive it:
- Pretreatment. Make-up and oil on the lashes block the bond. Clean with lash shampoo and protein-removing pads, then prime.
- Adhesive amount. A neat ball of glue on the extension tip (the scoop technique), not a film or a heavy blob.
- Humidity and temperature. Most professional adhesives want 45 to 65% humidity and 20 to 22°C; the London Lash Pro Glue Chart matches a glue to your salon.
- Isolation. Stickies, where two lashes bond together, damage the follicle as the lash grows. Check for them for 10 minutes at the end.
- Distance from the lid. Aim for 0.5 to 1 mm. Too close and glue hits the skin, too far and the extensions twist.
After that, retention is on the client: no water for 24 hours, a daily oil-free cleanse, no rubbing and no saunas or steam rooms.
Common Beginner Mistakes
- Choosing the type or diameter for the desired look while ignoring the natural lash, which causes overload and breakage.
- Too much or too little glue, or skipping pretreatment.
- Leaving stickies unchecked at the end of the set.
Patch Testing and What’s on the Label
Most lash adhesives are based on cyanoacrylate, an irritant to skin, eyes and airways. The glue should never touch skin, only the natural lash. Before a new client’s first set, run a patch test: 5 to 10 fine extensions, then a 24 to 48 hour wait to check for redness, swelling or itching. It will not catch every sensitivity, but it is a baseline safety step and a condition of most insurance policies.
Learn to read the packaging too. In the UK and EU, a professional adhesive carries a UFI (Unique Formula Identifier, a code for tracing the formula), CLP labelling (Classification, Labelling and Packaging, the EU system for flagging hazardous substances) and an SDS (Safety Data Sheet, with contents and first aid). London Lash Pro formulas comply with UK and EU chemical safety standards under REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals). Insurers like the ABT (Association of British Therapists) usually require a patch test for cover.
Where to Start
Classic is the logical place to begin: it builds the core skills of isolation and direction and gives a predictable result. Hybrid and volume follow once fan control and mapping are solid, with mega volume left for advanced level and its weight control.
All four types need the same fundamentals: clean pretreatment, the right weight on each natural lash, careful isolation and a glue matched to your salon. Get those down on classic and you can move up to volume, hybrid and mega volume with confidence.
