Next: Module 3

Module 2 — Lash Extension & Adhesive Principles

Understanding materials, weight, and chemistry for safe classic lashing.

1. Lash Extension Fundamentals

What Are Lash Extensions Made Of?

Modern lash extensions are typically synthetic PBT (Polybutylene Terephthalate):

  • Heat-molded to hold curl
  • Lightweight
  • Consistent shape
  • Hypoallergenic

Types:

  • Faux Mink
    • Softer, matte, flexible
  • Faux Silk
    • Slightly shinier, firmer
  • Cashmere
    • Softer, lighter, matte
    • Flat/ellipse base = larger surface contact, better bonding, often improved retention
LashPals Bunny fluff lash extensions (Faux Mink)
Bunny fluff — Faux Mink
LashPals Bunny silk lash extensions (Faux Silk)
Bunny silk — Faux Silk
LashPals Bunny plush lash extensions (Cashmere)
Bunny plush — Cashmere

True animal mink is rarely used in professional environments.

View LashPals lash trays here.

2. Diameter & Weight Rules

Common classic diameters:

  • 0.10 mm, 0.12 mm, 0.15 mm, 0.18 mm, 0.20 mm
  • Smaller number = lighter weight
Common classic diameters: 0.10 mm to 0.20 mm lash extension thickness comparison
Common classic diameters
The Golden Rule of Weight: An extension should not weigh more than the natural lash can safely support. Overloading causes premature shedding, weakening, follicle damage, traction alopecia.

Classic weight guidelines:

  • 0.10 mm → very safe
  • 0.12 mm → ideal for softer classics
  • 0.15 mm → industry standard
  • 0.18 mm → only for strong natural lashes
  • 0.20 mm → rarely recommended

When in doubt → go lighter.

Length safety: Do not exceed 2–3 mm longer than the natural lash length. Too long = leverage stress = early fallout.

3. Good Quality vs. Poor Quality Extensions

High-quality:

  • Consistent curl, uniform thickness, tapered tips
  • Matte finish, flexible fiber, stable curl retention

Poor quality signs:

  • Uneven curl, blunt or thick tips, excessive shine
  • Inconsistent lengths, stiff or brittle fibers, poor strip adhesion

LashPals supplies high-quality, premium lash extension trays at affordable prices.

4. Curl Types & Eye Styling Basics

  • J Curl — Very natural, minimal lift; rarely used today.
  • B Curl — Slight lift, natural mascara effect.
  • C Curl — Soft open-eye look, beginner-friendly.
  • CC Curl — Most popular; slightly stronger than C; great for straight lashes.
  • D Curl — Dramatic lift; great for downward-facing natural lashes.
  • L & M Curls — Flat base, strong lift; good for hooded eyes.

If unsure → start with C or CC. Overly dramatic curls on weak lashes can cause lifting or twisting.

Diagram of lash curl types from J to D curl
Curl types

5. Adhesive Principles

Primary ingredient: Cyanoacrylate (creates the bond).

Other ingredients may include:

  • Carbon black
  • Stabilizers
  • Thickeners

Adhesive Chemistry Basics

Cyanoacrylate cures when it reacts with moisture in the air (humidity matters).

Ideal range (varies by brand):

  • 40–60% humidity, 20–23°C
  • LashPals Bear adhesives work in an extremely wide range

Humidity effects:

  • Low humidity → glue cures too slowly, poor retention
  • High humidity → cures too fast, weak brittle bonds

Tips:

  • Use a hygrometer
  • Beginners should use slower-curing adhesive (e.g. 1–2 second)

Common mistakes:

  • Too much glue
  • Not replacing drops
  • Poor isolation
  • Poor humidity control
  • Attaching to skin

Retention problems are usually technique or environment — not "bad glue."

Safety: Fumes can irritate eyes.

  • Work in ventilated room
  • Replace glue drops every 15–20 min
  • Use Lash Bonder after service (e.g. LashPals Purrfect Bonder)

View LashPals Purrfect Bonder here.

Retention problems are usually technique or environment — not “bad glue.” Safety: Fumes can irritate eyes. Work in ventilated room; replace glue drops every 15–20 min; use Lash Bonder after service (e.g. LashPals Purrfect Bonder).

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