What Are Lash Extensions Made Of? | Materials Explained

Sometimes they look so natural and hair-like, while other times they’re more gleaming and glamorous… What are eyelash extensions made of, exactly?

In the early days, falsies and lash extensions were made of organic materials, especially human and animal hair. Today, most modern eyelash extensions are made from synthetic fibers, with PBT (polybutylene terephthalate) among the most commonly used materials.

Terms like “mink,” “faux mink,” and “silk” can be confusing because they don’t always describe what the lashes are actually made from. In many cases, they describe the look and finish of synthetic lash fibers rather than real mink fur or silk.

In this post, we’ll cover the main eyelash extension materials, explain what’s behind terms like mink and silk, look at what DIY lash clusters are made of, and explain how lash extensions are made.

Main Types of Eyelash Extension Materials
Comparison of Different Materials
What Are DIY Lash Extensions Made Of?
Manufacturing Process of Eyelash Extensions
Beyond Materials: Additional Factors

Main Types of Eyelash Extension Materials

These are the most common types of lash extension materials and what you should know about them.

PBT

The most common lash extension material is PBT, or polybutylene terephthalate. It’s a synthetic thermoplastic polyester that can be formed into very fine fibers and manufactured in different curls, thicknesses, tapers, and finishes.

Depending on how the PBT fibers are made, they can have different looks and textures, including finishes designed to resemble silk or mink. This versatility is one reason PBT is so commonly used for modern eyelash extensions.

Mink

Today, real mink fur is sometimes used in false lashes, but it’s much less common in modern eyelash extensions. In most cases, the term “mink lash extensions” refers to faux-mink lashes made from synthetic fibers such as PBT and designed to look soft and fluffy.

Faux-mink lashes usually have a matte or demi-matte finish, which helps create their softer look. The exact taper, thickness, and finish can vary between brands.

Real mink lashes, where available, are made using actual mink fur. There are also ethical concerns around animal-derived mink lashes and how the fur is sourced. If avoiding animal-derived materials is important to you, check the manufacturer’s product information rather than relying on the word “mink” alone.

Silk

As with mink, silk eyelash extensions are usually made from synthetic fibers such as PBT rather than real silk. Terms like “vegan silk,” “faux silk,” and “synthetic silk” are commonly used to describe the look and finish of these lashes.

Faux-silk lashes often have a slightly more noticeable sheen than faux-mink styles, which can make them look darker or more defined. The exact finish and taper will depend on how the fibers are manufactured.

Some false-lash products may be marketed as real silk, so if the actual material matters to you, check the manufacturer’s product information rather than assuming that “silk” always refers to the fiber itself.

Human Hair

You might occasionally find human hair in strip-lash falsies, but it is rarely utilized for professional, semi-permanent eyelash extensions today.

Though organic hair offers a wispy look, synthetic PBT fibers are far more versatile; they can be precisely engineered with specific tapers, curls, and finishes to achieve a variety of distinct aesthetics.

Comparison of Different Materials

Material	Commonly Used For	Source	Typical Finish
PBT	Eyelash extensions and false lashes	Synthetic	Varies by manufacturing
Real Mink	Some false-lash products	Animal fur	Soft, natural-looking
Faux Mink	Extensions and false lashes	Usually synthetic PBT	Soft, matte or demi-matte
Faux Silk	Extensions and false lashes	Usually synthetic PBT	Slight sheen
Human Hair	Some false-lash products	Human hair	Wispy, natural-looking

The important thing to remember is that PBT, faux mink, and faux silk aren’t necessarily three completely different materials. Faux mink and faux silk often describe different finishes and styles created from synthetic fibers such as PBT.

What Are DIY Lash Extensions Made Of?

At Lilac St., we create easy-to-apply lash extensions that are designed for home use! They offer the versatility and multi-day wear of professional lash extensions and the ease of use of false lashes.

Our DIY lash extensions are made of a type of PBT also known as Korean silk or vegan silk. The fibers have the slight sheen of silk, which lends a glamorous look to the eyes. That said, the sheen isn’t excessive, so they’re still a soft and versatile option.

The vegan silk fibers are shaped by hand into fluttery, spiky, or full clusters and attached to an ultra-thin cotton band that’s invisible when applied.

Each set includes five extension segments per eye for quick, easy application. They can stay for several days when you use our beginner-friendly Lilac Lash Glue, and for over a week when using our Pro Lash Glue. Our lash cluster adhesives are acrylate-based, gentle, and safe for sensitive eyes.

Manufacturing Process of Eyelash Extensions

The way eyelash extensions are made is fascinating. The production process is the main factor that drives how they look and feel since most lash extensions on the market are made of the same synthetic material, PBT.

The PBT first starts as pellets, which are then heated and stretched into long fibers. The ultra-long fibers are trimmed into bundles. These bundles are then organized by hand, with the help of special measuring equipment, attached to an adhesive strip, and then trimmed to a specific length while retaining their tapered edge. Finally, the extension fibers are carefully placed into packs and sold to salons and beauty retailers.

Beyond Materials: Additional Factors

Beyond materials, here are other factors to consider when getting professional lash extensions.

Sheen vs matte: Matte or demi-matte lashes (usually sold as faux mink) tend to look softer, fluffier, and more natural. Lashes with a sheen (usually sold as faux silk or vegan silk) often seem more glamorous since the reflectiveness can be reminiscent of mascara.
Long vs. short taper: Lashes with a longer taper are generally a little thinner, creating a very feathery look, while lashes with a shorter taper look a little thicker and more intense.
Curl: The level of roundness and curl angle can create a more open-eyed or sultrier look. The most common curved lash curls are C, D, and DD, while J, L, and M are the more popular angled styles.
Length: The right lash length for you will depend on your natural lash size, as well as the style you’re aiming for. Lash length distribution will also affect the overall shape and style of your lash extensions.
Volume vs. classic: If you’re getting your lashes done professionally, you’ll need to choose between classic lashes, which feature one lash fiber attached to each natural lash, and volume lashes, which feature several very thin lash clusters attached to each natural lash. Hybrid lashes alternate between thicker individual classic lashes and thin volume clusters.

Final Thoughts

Thanks to its versatility and cruelty-free nature, the synthetic polymer PBT is easily the best material for lash extensions. It can be shaped and cut in many ways, allowing lash artists to create a wide range of lash extension looks. Even for our own

lash clusters, vegan silk made of PBT guarantees the perfect balance of flutteriness and subtle sheen.