Do Lash Extensions and Promades Expire?
Technically, yes — but the real story isn’t about time, it’s about quality.
Lash extensions and promades don’t “expire” the way food does. They degrade when the synthetic fiber loses its structure — meaning the curl relaxes, the surface loses smoothness, or the base starts to flake. This degradation depends far more on how the lashes were made than on how long they’ve sat on a shelf.
That’s why two trays from different brands can age very differently — and why high-grade manufacturing like ours at Lash Oasis ensures lashes perform beautifully even after months of storage.
The Material: PBT — and Why Not All PBT Is Equal
Most professional lashes are made from PBT (polybutylene terephthalate), a durable thermoplastic used in high-performance fibers. But not all PBT is created equal.
Low-grade PBT may look identical at first glance, but:
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It softens or loses curl faster under heat and humidity.
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It can feel stiff or plasticky instead of silky.
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The color can fade to grey over time.
At Lash Oasis, we use premium-grade Korean PBT, specifically formulated for curl memory and elasticity. This means:
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The curl holds longer after baking.
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The lashes remain jet-black and matte, even months later.
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The fiber flexes naturally, giving that soft, fluttery feel clients love.
The Curl Process: The Secret Is in the Bake
PBT lashes don’t come pre-curled — the shape is created during heat processing. This is where real quality shows.
Poor-quality manufacturing often means:
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Lashes are baked too hot or too short, causing the curl to lose memory over time.
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The fibers are coiled loosely or unevenly on the rods before baking, resulting in inconsistent curls.
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Over-baking can make fibers brittle or shiny.
In contrast, our factory partners in Korea use precision temperature control to “set” the curl in PBT at the molecular level. Each lash type (C, CC, D, M, etc.) is baked on its own rod profile, held long enough to stabilize but not scorch.
That’s why Lash Oasis curls stay true, even after months in your kit or during humid summers — a key advantage that cheaper imports can’t replicate.
The Promade Difference: Base Perfection Matters
For promades, longevity isn’t just about the fiber — it’s also about how the fans are bonded.
Many budget promades use too much glue or low-temperature bonding, which can cause:
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Flaking or separation after a few weeks in storage.
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Poor fan symmetry.
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Bases that pop off when you pick them up with tweezers.
Our Lash Oasis Promades are:
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Heat-bonded at controlled temperatures to ensure stability without brittle residue.
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Designed with minimal, even adhesive for clean pickup.
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Produced in small batches and vacuum-sealed to preserve structure and cleanliness.
That’s why they fan easily and hold their shape right out of the box — whether you open them tomorrow or next year.
How to Maximize Lash Shelf Life
Even premium lashes deserve proper care:
✅ Keep them sealed until use.
✅ Store in a cool, dry environment.
✅ Avoid humidity (especially around adhesives).
✅ Rotate your trays regularly and note opening dates.
With good storage, Lash Oasis lashes maintain professional performance for 2–3 years unopened, and up to a year after opening.
Why Investing in Quality Saves You More
Lash artists sometimes choose cheaper lashes thinking they’re saving money — but when curls drop, fans crumble, or color fades, you end up wasting stock and redoing sets.
Premium-grade materials like those used in Lash Oasis:
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Retain curl memory for far longer.
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Maintain color depth and texture.
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Offer consistent results that protect your reputation.
The best investment isn’t in more trays — it’s in better lashes.\
Conclusion
Lashes don’t truly “expire” — they degrade in proportion to their quality. High-grade PBT, precision baking, and expert bonding make the difference between lashes that wilt and lashes that wow.
At Lash Oasis, we invest in the chemistry, engineering, and craftsmanship behind every fan and fiber — so your sets stay flawless longer.