A closer look at ingredient detection, regulatory gaps, cyanoacrylate chemistry, professional lash adhesive safety, and why clearer industry standards are needed.
INDUSTRY INSIGHT • AUGUST 2026
In August 2026, eyelash adhesives became the subject of widespread public discussion in China after a consumer investigation reported the detection of substances including formaldehyde, hydroquinone, toluene and cyanoacrylates in a number of tested products.
The findings deserve attention.
Products used close to the eyes should be manufactured responsibly. Raw materials should be controlled, product formulations should be managed carefully, and potential safety concerns should be taken seriously.
However, an equally important question has received far less attention:
What standard should actually be used to determine whether a professional eyelash extension adhesive is compliant or non-compliant?
This question matters because professional eyelash extension adhesive is not simply a cosmetic product, nor can its safety or compliance be determined only by identifying the names of individual chemicals.
To understand what the 2026 investigation really tells us, several different questions need to be separated:
What was detected?
At what concentration was it detected?
Why may the substance be present?
How was it tested?
What product category is being evaluated?
What regulatory or technical standard actually applies?
These questions are related, but they are not the same.
What Happened in the 2026 Lash Adhesive Investigation?
According to publicly available information, the Shanghai Consumer Council conducted an investigation and comparative testing involving 28 eyelash adhesive samples.
The samples included both consumer false-eyelash adhesives and professional eyelash extension adhesives.
Public reports stated that substances including hydroquinone, formaldehyde, toluene, methyl methacrylate and cyanoacrylates were detected in some of the samples.
Understandably, these reports attracted significant attention from consumers, lash artists, manufacturers and brands.
Potentially hazardous substances used around the eye area deserve careful evaluation.
However, a laboratory finding that a substance has been detected does not automatically establish that a finished product is legally non-compliant.
That distinction is important.
Detection Is Not the Same as Non-Compliance
When evaluating any laboratory test result, three different concepts should be considered.
1. Detection
Detection means that an analytical method identified the presence of a particular substance in a sample.
It answers one question:
Was this substance detected?
It does not, by itself, answer:
Is the product unsafe?
Does the product violate an applicable regulation?
Those conclusions require additional information.
2. Risk Assessment
Risk assessment asks a different set of questions.
For example:
What is the measured concentration?
Why is the substance present?
Is it intentionally added?
Is it present as a stabilizer, impurity, residual substance or degradation product?
How is the product used?
What level of exposure can reasonably occur?
What route of exposure is relevant?
What toxicological data apply to that particular exposure?
A trace-level detection and a much higher concentration should not automatically be treated as equivalent situations.
Concentration matters. Exposure matters. Intended use matters. Formulation context matters.
3. Regulatory Non-Compliance
A regulatory determination requires another question:
What rule, technical requirement or concentration limit applies to this specific product category?
For a product to be described as legally non-compliant, there should normally be a clear basis for comparison.
That basis may include:
product classification,
applicable regulation,
defined analytical method,
concentration limit,
and pass/fail criteria.
Without establishing those points, the word "detected" should not automatically be translated into "non-compliant."
This distinction becomes especially important when discussing professional eyelash extension adhesives in China.
How Is Eyelash Adhesive Classified in China?
China's National Medical Products Administration has previously addressed the classification of adhesives used to attach artificial eyelashes.
The regulator explained that although such adhesive is applied around natural and artificial eyelashes, its primary purpose is bonding.
For that reason, eyelash adhesive does not fall within the definition of cosmetics simply because it is used in the beauty industry or near the eye area.
This creates an important regulatory distinction.
Professional eyelash extension adhesive is clearly associated with professional beauty services, but its principal technical function is adhesion.
At the same time, the current discussion has highlighted another challenge:
Publicly available information currently indicates that China does not yet have a dedicated national product standard specifically designed for professional eyelash extension adhesives.
This is the core issue that deserves more industry attention.
If a test identifies a measurable amount of a particular substance in professional lash adhesive, what exact threshold should be used to determine whether the product passes or fails?
Should the result be evaluated according to:
a cosmetic ingredient requirement,
an industrial adhesive requirement,
a general product safety principle,
an occupational exposure standard,
or a dedicated professional eyelash adhesive standard?
These standards serve different purposes and should not automatically be treated as interchangeable.
The absence of a dedicated lash adhesive standard does not mean manufacturers should operate without safety controls.
It means the industry needs clearer and more product-specific technical requirements.
Can Cosmetic Standards Be Used as a Reference?
Because professional eyelash adhesives are used close to the eyes, cosmetic safety requirements can provide useful information when assessing potential risk.
It may therefore be reasonable for researchers, manufacturers and regulators to refer to cosmetic ingredient restrictions when considering whether a particular substance deserves further attention.
However, an important distinction must be maintained between:
using a cosmetic requirement as a safety reference
declaring that a non-cosmetic product legally fails a cosmetic standard.
These are not the same conclusion.
A comparison with a cosmetic standard may provide valuable context.
But if that standard is not legally applicable to professional eyelash adhesive, it should be clearly identified as a reference benchmark, rather than automatically treated as the legal pass/fail requirement for that product.
A scientifically useful discussion therefore needs to go beyond a simple question of whether a substance was detected.
It should ask:
How much was detected?
Why is it present?
How was it measured?
What exposure is expected?
What product classification applies?
What technical or regulatory limit is being used for comparison?
Does Cyanoacrylate Mean "502 Glue"?
One of the most widely discussed claims surrounding professional lash adhesives is the comparison between cyanoacrylate-based lash glue and common instant adhesives.
This comparison requires context.
Cyanoacrylate Is a Chemical Family - Not a Product Category
Cyanoacrylates are a family of fast-polymerizing adhesive materials.
Different cyanoacrylate compounds can be used in different adhesive applications.
Professional eyelash extension adhesives commonly rely on cyanoacrylate-based bonding systems because the application requires rapid bonding between an artificial lash extension and a natural eyelash.
The fact that two adhesive products both use a member of the cyanoacrylate family does not automatically make them the same finished product.
A meaningful technical comparison would need to consider factors such as:
specific cyanoacrylate monomer,
purity,
raw-material grade,
stabilizer system,
formulation,
impurities,
viscosity,
curing characteristics,
manufacturing controls,
intended use,
application method,
and exposure conditions.
Shared chemistry does not mean identical formulation, purity, performance or risk profile.
Describing every cyanoacrylate-based professional eyelash adhesive as simply equivalent to an industrial instant adhesive therefore oversimplifies a much more complex formulation issue.
International regulatory approaches also demonstrate that cyanoacrylate-based eyelash extension adhesives can be treated as a specific professional-use product category rather than being defined only by the name of one chemical family.
The more useful question is not:
Does this adhesive contain cyanoacrylate?
The better question is:
Which cyanoacrylate system is being used, how is the product formulated, and how is that formulation controlled?
Why Can Hydroquinone Appear in Cyanoacrylate Adhesives?
Hydroquinone has attracted considerable attention in the current discussion.
Again, formulation context matters.
In some cyanoacrylate adhesive systems, hydroquinone may be associated with stabilization and the control of premature polymerization during storage.
That does not mean that every concentration of hydroquinone should automatically be considered acceptable.
But it does mean that the correct technical question is more detailed than:
Was hydroquinone detected?
A proper evaluation should ask:
Why is it present?
What function does it serve in the formulation?
What is the measured concentration?
What is the expected exposure?
What product category is being evaluated?
What limit is applicable in the target market?
What raw-material and manufacturing controls are in place?
International regulatory examples demonstrate why this distinction matters.
Some jurisdictions specifically regulate hydroquinone in professional cyanoacrylate adhesive applications by setting conditions and concentration limits.
This does not mean that one country's limit should automatically become another country's standard.
It demonstrates a more important principle:
Professional eyelash adhesive chemistry can be regulated through product-specific limits and conditions rather than through ingredient names alone.
Formaldehyde: Added Ingredient or Trace Detection?
Formaldehyde deserves serious attention because of its toxicological profile and the sensitivity of the eye area.
However, analytical interpretation still requires precision.
There is an important difference between:
formaldehyde intentionally added as part of a formulation
formaldehyde detected at trace level as an impurity, residual substance, degradation product or result of chemical processes occurring within a formulation.
These situations should not automatically be treated as identical.
This is why a useful laboratory result should ideally provide more information than simply:
Detected / Not Detected
Important analytical information can include:
test method,
detection limit,
quantification limit,
actual measured concentration,
sample preparation,
and the standard or benchmark used for evaluation.
Two samples could both be described publicly as having "formaldehyde detected" while containing dramatically different measured concentrations.
Without concentration and analytical context, the phrase alone does not provide enough information for a complete technical assessment.
This is also why responsible product claims are important.
For example:
FORMULATED WITHOUT ADDED FORMALDEHYDE
describes a formulation decision: formaldehyde is not intentionally added as an ingredient.
That is different from making an absolute claim such as:
0% FORMALDEHYDE
NO FORMALDEHYDE DETECTED
unless appropriate analytical testing supports such a claim under clearly defined testing conditions.
What Information Is Needed to Properly Interpret a Lash Adhesive Test?
For manufacturers, professional buyers, regulators and consumers to properly understand a laboratory finding, sufficient analytical context is essential.
A meaningful evaluation should ideally identify the following information.
Exact Product Tested
The brand, product name, size and product variant should be clearly identified.
Batch Information
Where possible, the lot or batch number and relevant production information should be recorded.
Testing Laboratory
The laboratory responsible for performing the analysis should be identified.
Test Method
The analytical method used to identify and quantify the substance should be clearly stated.
Limit of Detection - LOD
The lowest concentration that the method can reliably detect provides important context for interpreting the word "detected."
Limit of Quantification - LOQ
The lowest level that can be reliably quantified is equally important.
Actual Measured Concentration
A numerical concentration is significantly more informative than a simple detected/not-detected statement.
Product Classification
The regulatory category under which the product is being evaluated should be defined.
Applicable or Referenced Standard
The exact regulation, technical specification or reference benchmark should be identified.
Pass/Fail Criteria
If a product is described as compliant or non-compliant, the basis for that conclusion should be clearly stated.
These details allow readers to move beyond a headline and understand what a laboratory result actually means.
International Markets Show That Dedicated Regulation Is Possible
Professional eyelash extension adhesive is a global professional beauty product.
Different jurisdictions classify and regulate these products in different ways.
Some markets specifically recognize cyanoacrylate-based eyelash extension adhesives as a professional-use category and establish requirements covering ingredients, professional application and safety warnings.
This approach recognizes two realities at the same time:
Professional eyelash adhesive requires appropriate safety controls.
Professional eyelash adhesive has specialized chemistry and application characteristics that should be evaluated in context.
Looking at international approaches does not mean that China should simply copy another country's requirements.
Different markets have different regulatory structures.
However, international examples demonstrate that it is possible to establish a regulatory framework specifically designed around the chemistry, intended use and exposure characteristics of professional eyelash extension adhesives.
What the Professional Lash Adhesive Industry Actually Needs
The 2026 investigation has created significant public attention.
That attention can be constructive if it leads to better standards, better transparency and better manufacturing practices.
Rather than reducing the discussion to whether a particular chemical name sounds "industrial" or "cosmetic," the professional lash industry would benefit from a more complete technical framework.
Clear Product Classification
Professional eyelash extension adhesive needs a clear and consistent regulatory identity.
Dedicated Technical Standards
Relevant substances should have defined analytical methods and scientifically supported limits appropriate to professional lash adhesive.
Raw-Material Requirements
Manufacturers should understand and control the specification, purity and consistency of critical raw materials.
Batch Traceability
Finished products should be connected to identifiable production batches and quality-control records.
Appropriate Analytical Testing
Testing should be selected according to formulation, product characteristics, risk profile and destination-market requirements.
Transparent Test Interpretation
Testing methods, detection limits, measured concentrations and reference limits should be communicated clearly.
Professional-Use Instructions
Products designed for professional eyelash extension application should clearly communicate their intended use, operating conditions and appropriate precautions.
Storage and Stability Control
Cyanoacrylate-based adhesives are sensitive materials. Packaging, temperature, moisture exposure, storage conditions and working environment can all influence product stability and performance.
Our Approach: Control Before Claims
At Lash Supply Network, we believe professional eyelash adhesive should be evaluated as a complete manufacturing system rather than through a single marketing statement.
The process includes:
RAW MATERIAL REVIEW
FORMULATION MANAGEMENT
CONTROLLED PRODUCTION
BATCH QUALITY CONTROL
PERFORMANCE EVALUATION WHERE APPLICABLE
TESTING & DOCUMENTATION BASED ON PRODUCT AND MARKET REQUIREMENTS
OEM / ODM / PRIVATE LABEL PRODUCTION
For professional lash brands, distributors and salon businesses, adhesive development should begin with the target market, professional application requirements and intended performance.
Drying speed and retention are important.
But they should not be the only criteria used to evaluate a professional eyelash adhesive.
Formula management, raw-material control, manufacturing consistency, packaging compatibility, storage conditions, documentation and responsible product claims all matter.
We also believe product claims should be specific and supportable.
Where applicable, wording such as:
FORMULATED WITHOUT ADDED FORMALDEHYDE
is more precise than making an absolute "0%" or "not detected" claim without defining the relevant analytical method and detection threshold.
Better Standards Will Create Better Lash Adhesives
The current discussion around professional eyelash adhesives should not become a simple debate between media organizations and manufacturers.
Nor should legitimate safety questions be ignored simply because the industry currently lacks a dedicated product standard.
Both extremes miss the larger opportunity.
The more useful questions are:
What substances are present?
At what concentrations?
Why are they present?
How were they measured?
What exposure is relevant?
What product category is being evaluated?
What standard should apply?
These are the questions that can lead to better regulation, better manufacturing and better products.
The 2026 investigation may ultimately help accelerate an overdue discussion about dedicated standards for professional eyelash extension adhesives in China.
That would benefit consumers, lash artists, responsible manufacturers and professional lash brands.
Until clearer product-specific standards are established, the industry can still improve what is already within its control:
better raw-material management, better testing transparency, better batch traceability, better documentation and more responsible product claims.
A safer and more professional lash adhesive industry requires:
clear standards, transparent testing and responsible manufacturing - not conclusions based on ingredient names alone.
Looking for a Professional Eyelash Adhesive Manufacturing Partner?
Lash Supply Network supports professional lash brands, distributors and salon businesses with OEM, ODM and Private Label eyelash adhesive development.
From formulation requirements and performance targets to bottle selection, packaging, quality control and market-specific documentation, our goal is to develop professional adhesive products around the actual requirements of each project and target market.
DISCUSS YOUR EYELASH ADHESIVE PROJECT WITH OUR TEAM →
Sources & References
The following sources support the regulatory, analytical and international-context statements discussed in this article. Requirements and regulatory interpretations may change over time, so readers should confirm current requirements in the relevant market.
1. National Medical Products Administration (China)
Official reply on the classification of adhesive used to attach false eyelashes; the reply states that adhesive whose purpose is bonding does not fall within the cosmetics category.
https://www.nmpa.gov.cn/directory/web/nmpa/xxgk/fgwj/gzwj/gzwjhzhp/20240614144055156.html
2. The Paper / public reporting on the 2026 investigation
Reporting on the Shanghai Consumer Council investigation and comparative testing of 28 eyelash adhesive samples, including discussion of current classification and standards gaps.
https://www.thepaper.cn/newsDetail_forward_33709683
3. Health Canada - Cosmetic Ingredient Hotlist
Current conditions for cyanoacrylate adhesives used for eyelash extensions and the hydroquinone entry for cyanoacrylate adhesive products used for eyelash and eyebrow extensions.
https://www.canada.ca/en/health-canada/services/consumer-product-safety/cosmetics/cosmetic-ingredient-hotlist-prohibited-restricted-ingredients/hotlist.html
4. Health Canada - Compliance Verification Project 2023–2024
Compliance review of cyanoacrylate-based eyelash extension adhesives, including professional-use and labelling conditions.
https://www.canada.ca/en/health-canada/services/consumer-product-safety/reports-publications/industry-professionals/enforcement-summary-report/compliance-verification-project-2023-2024-cosmetic-regulations-cyanoacrylate-ingredients.html
5. PubChem - Methyl Cyanoacrylate
Chemical information including reported degradation products such as formaldehyde.
https://pubchem.ncbi.nlm.nih.gov/compound/Methyl-cyanoacrylate
6. PubChem - Ethyl Cyanoacrylate
Chemical information including reported degradation products such as formaldehyde.
https://pubchem.ncbi.nlm.nih.gov/compound/Ethyl-cyanoacrylate
7. Patent literature - Stabilized Cyanoacrylate Formulations
Technical formulation literature describing hydroquinone as a free-radical stabilizer in stabilized cyanoacrylate adhesive compositions.
https://patents.google.com/patent/EP1928920A2/en
Industry Information Notice: This article is provided for general industry information and does not constitute legal, regulatory, toxicological or medical advice. Product classification, testing requirements and permitted limits may vary by jurisdiction and may change over time.
