For period underwear, incontinence underwear, period swimwear, and other functional underwear brands, PFAS compliance is becoming an important part of product development and supplier selection.
The EU’s new PFHxA restriction for consumer clothing took effect on October 10, 2026, adding another requirement for brands sourcing functional textiles.
But asking a manufacturer, “Is your product PFAS-free?” is no longer enough.
Brands need to understand which regulations apply, which materials have been assessed, what testing has been completed, and whether the supporting documents match the actual production materials.
The key principle is simple: PFAS compliance should be supported by material-level evidence, relevant testing, and traceable supplier documentation—not just a general marketing claim.
1. What Changed Under the EU PFHxA Restriction in 2026?
Under Commission Regulation (EU) 2024/2462, the EU introduced REACH Annex XVII Entry 79, restricting PFHxA, its salts, and PFHxA-related substances in specified products.
From October 10, 2026, the restriction applies to textiles used in clothing and related accessories for the general public, subject to the regulation’s scope and exemptions.
The main concentration limits are:
| Restricted Substance | EU Limit |
|---|---|
| Sum of PFHxA and its salts | Below 25 ppb |
| Sum of PFHxA-related substances | Below 1,000 ppb |
These limits are measured in homogeneous material, not simply averaged across an entire finished garment.
For functional underwear, this distinction matters.
A product may contain several different materials, including body fabric, absorbent layers, a waterproof barrier, elastic components, and bonded structures.
Brands should therefore confirm which materials are covered by the supplier’s compliance evidence.
The regulation also includes an exemption for articles placed on the market before October 10, 2026, as well as specific product exemptions.
Importantly, this is a restriction on a defined PFAS subgroup. It is not a blanket ban on every PFAS substance.
A broader EU-wide PFAS restriction has also been proposed, but it should not be confused with the PFHxA restriction already in force.
2. PFAS Requirements Are Not the Same in Every Market
Brands selling internationally should not assume that one test report or declaration automatically satisfies every destination market.
| Market | Key Requirement |
|---|---|
| European Union | PFHxA, its salts, and related substances are restricted in consumer clothing textiles from October 10, 2026. |
| Great Britain | UK REACH operates separately from EU REACH. The EU’s new PFHxA restriction does not automatically become GB law. |
| Northern Ireland | EU REACH continues to apply under the relevant arrangements. |
| California, USA | Restrictions on regulated PFAS in textile articles began January 1, 2025, including intentionally added PFAS and a total organic fluorine threshold of 100 ppm, reducing to 50 ppm in 2027. |
| New York, USA | Intentionally added PFAS have been prohibited in new apparel, including undergarments, since January 2025. |
| Minnesota, USA | Intentionally added PFAS have been prohibited in menstruation products, including period underwear, since January 2025. |
For brands supplying multiple markets, compliance planning should begin with the intended destination countries and states.
The relevant requirements may differ in chemical scope, concentration thresholds, testing expectations, and documentation.
3. Which Functional Underwear Materials Should Be Checked?
Functional underwear often combines more materials than conventional underwear.
A typical leakproof construction may include:
- Skin-contact lining
- Absorbent core
- Waterproof or leak-resistant barrier
- Outer fabric
- Elastic, bonding, and finishing materials
PFAS-related risks may arise from certain water-repellent finishes, fluorinated coatings, membranes, processing chemicals, or other material treatments.
For period underwear and reusable incontinence products, buyers should pay particular attention to the waterproof barrier and laminated gusset structure.
Does TPU or PUL Automatically Mean PFAS-Free?
No.
TPU and PUL are commonly used in leakproof underwear construction, and suitable formulations can provide waterproof performance without intentionally added PFAS.
However, a material description such as “TPU waterproof layer” or “PUL laminated fabric” does not establish PFAS compliance by itself.
Buyers should ask whether the membrane, adhesive, coating, and finished laminate have been assessed.
The same applies to fabrics described as recycled, organic, or environmentally friendly. These characteristics do not independently establish PFAS compliance.
4. What PFAS Testing Should Brands Request?
Not every PFAS test answers the same question.
For sourcing teams, it is useful to distinguish between two approaches.
Targeted PFAS Testing
Targeted chemical analysis looks for specified PFAS compounds.
Depending on the substance and material, laboratories may use methods involving LC-MS/MS or GC-MS/MS. Textile methods such as EN 17681-1:2025 may form part of an appropriate testing strategy.
For EU PFHxA compliance, the laboratory should confirm whether its analytical scope adequately addresses the relevant substances and regulatory limits.
A report covering only PFOA or PFOS should not be treated as proof of compliance with the PFHxA restriction.
Organic Fluorine Screening
Total organic fluorine testing can help identify fluorinated organic substances and is particularly relevant to certain US state requirements.
However, an organic fluorine result does not identify every individual PFAS compound.
Likewise, a targeted PFAS test may not detect substances outside its analytical scope.
For this reason, brands should discuss the appropriate combination of supplier formulation review, targeted analysis, and fluorine screening with a qualified laboratory.
What Makes a Test Report Useful?
Before accepting a report, check:
- The exact material or product tested
- Sample identification and relevant batch
- Laboratory name and accreditation scope
- Test method and list of analyzed substances
- Detection or quantification limits
- Actual results, units, and report date
For example, a “not detected” result is only meaningful when the reporting limit is sufficiently low for the applicable legal threshold.
Testing should also be reviewed when the material formulation, supplier, coating, or production process changes.
5. What Should a PFAS Supplier Declaration Include?
A supplier declaration can support chemical compliance management, but a generic statement saying “PFAS-free” may not provide enough information.
A useful declaration should identify:
1. Supplier and material information
The supplier’s legal name, material trade name, material code, and relevant product specifications.
2. Chemical scope
Whether PFAS are intentionally added, which restricted substances or regulations are addressed, and whether the statement is supported by formulation information or testing.
3. Regulatory reference
The applicable market requirements, such as EU REACH Annex XVII Entry 79 or relevant US state restrictions.
4. Supporting evidence
Relevant laboratory reports, material specifications, and other supporting documents.
5. Validity and change control
The date, covered material or production lots, authorized signatory, and a commitment to notify the buyer when formulations or suppliers change.
A declaration should accurately describe its scope. It should not imply that every PFAS substance has been analytically excluded when the supporting evidence covers only selected compounds.
6. Five Documents Buyers Should Check Before Bulk Production
For functional underwear sourcing, a practical compliance file should contain the following documents.
| Document | What Buyers Should Verify |
|---|---|
| Material Specification / BOM | All relevant fabrics, membranes, coatings, and bonding materials are identified. |
| Supplier PFAS Declaration | The statement names the material, chemical scope, applicable requirements, and date. |
| Laboratory Test Reports | Methods, tested substances, limits, sample identification, and results are suitable for the target market. |
| Relevant Certifications | Certificates are authentic, current, and applicable to the stated material or product. |
| Batch Traceability Records | Bulk materials can be linked to the approved sample, supplier lot, and finished production order. |
Certifications such as OEKO-TEX STANDARD 100 may provide useful supporting evidence within their defined scope.
However, a certificate should not automatically be interpreted as a universal guarantee of PFAS-free status or compliance with every destination-market requirement.
This is why documentation needs to remain connected to the actual materials used in production.
For a deeper explanation, see our guide to fabric traceability for period underwear brands.
7. Seven Questions to Ask Your Manufacturer
Before approving a new functional underwear collection, sourcing teams should ask:
- Which PFAS regulations have you assessed for our target markets?
- Are PFAS intentionally added to any fabric, membrane, coating, finish, or adhesive?
- Can you provide material-specific PFAS declarations and supporting test reports?
- Does the testing cover PFHxA, its salts, and relevant PFHxA-related substances where required?
- Can the reports be linked to our approved materials and production batches?
- What happens if a material supplier or chemical formulation changes?
- What evidence supports the exact PFAS-related claim we plan to use on our packaging?
These questions help brands identify gaps before placing a bulk order.
They also reduce the risk of discovering that a certificate applies to a different material, an older formulation, or a previous production batch.
8. PFAS Compliance Should Be Part of Product Development
Chemical compliance should not be treated as a final paperwork check after product development is complete.
For functional underwear, changing a waterproof barrier or coating may affect flexibility, breathability, bonding strength, wash durability, and leakage performance.
A replacement material therefore needs to be assessed for both chemical compliance and functional performance.
Brands should confirm material and testing requirements during the initial development brief.
Our period underwear OEM brief guide explains how to define material requirements, product claims, and testing expectations before sampling.
At Lynmiss Factory, OEM/ODM development discussions can include material selection, leakproof structure, product testing requirements, and the documentation needed for the buyer’s target market.
The goal is to align the approved sample, bulk materials, and supporting compliance evidence before production.
FAQ
Is a PFAS-free declaration enough for EU compliance?
Not necessarily. The declaration should be supported by relevant material information and evidence addressing the applicable EU restrictions. Depending on the product and risk assessment, appropriate laboratory testing may also be needed.
Does an OEKO-TEX certificate prove a product is PFAS-free?
Not automatically. Buyers should verify the certificate’s scope, validity, applicable requirements, and whether it covers the actual material or finished product.
Can a product pass US PFAS requirements but fail EU requirements?
Yes. Different jurisdictions may regulate different PFAS substances and use different thresholds or testing approaches. Compliance must be assessed against each applicable market requirement.
Should PFAS testing be repeated for every order?
There is no single universal testing frequency for all products and markets. Brands should establish a risk-based testing and verification plan, considering material changes, supplier changes, previous results, batch controls, and customer requirements.
Final Takeaway
PFAS compliance for functional underwear is no longer just a question of whether a manufacturer offers a PFAS-free material option.
Brands need a clearer verification process:
Target Market → Material Specification → Supplier Declaration → Appropriate Testing → Batch Traceability → Supported Product Claim
For period underwear, reusable incontinence underwear, and other leakproof products, this approach helps connect chemical compliance with material selection, product performance, and manufacturing consistency.
Planning a new functional underwear collection?
Contact Lynmiss Factory to discuss OEM/ODM material options, product development, testing requirements, and documentation for your target market.