U by Kotex Ultra Thin Pads with Wings, Regular Absorbency
Lower concern; common materials, no public PFAS claims or detection.
U by Kotex Ultra Thin uses standard period pad materials, cellulose and polyethylene. No brand disclosure on PFAS treatment, but absorbent period products typically have lower PFAS risk than water-resistant items.
We flunk more products than we pass. This one earned its grade. How we grade
Material
cellulose fluff pulp, polyethylene layers
Lab data
No public lab test
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What U by Kotex Ultra Thin Pads Absorbency is made of, ingredients and materials
U by Kotex Ultra Thin Regular uses cellulose fluff pulp as the absorbent core and polyethylene (PE) film layers for fluid barriers and the backing. Cellulose is a natural plant fiber that does not leach chemical residues under normal use. Polyethylene is a thermoplastic that remains stable at body temperature and does not degrade or off-gas during wear. The wings are also PE-based. Neither material is known to release harmful volatiles or migrate into the bloodstream during menstrual contact.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Dioxins and chlorine bleaching byproducts
Cellulose pulp used in pads is conventionally bleached; trace dioxins can result from chlorine bleaching processes. U by Kotex does not publicly disclose bleaching method (elemental chlorine, oxygen, or chlorine dioxide) or dioxin testing results. Industry data suggests modern manufacturing keeps levels below regulatory concern, but no product-specific assurance is available.
Bacterial contamination and growth during storage
Cellulose pulp can harbor bacteria if stored in humid conditions before purchase or after opening. This is a storage and handling risk, not an inherent product defect. Sealed packaging and dry storage mitigate this.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Fragrance allergens and sensitizers
U by Kotex Ultra Thin Regular does not list added fragrances in the product name or known marketing materials. Fragrance-related contact dermatitis is reported in some users of scented pad brands, but this product avoids that ingredient class.
Formaldehyde / VOCs
Polyethylene and cellulose do not contain formaldehyde-releasing compounds as binders or finishes. No known formaldehyde-based adhesives or cross-linking agents are used in conventional pad construction, including this product.
Source, ATSDR ↗Adhesive and backing material leachables
Polyethylene backing and PE-based adhesives do not leach plasticizers or heavy metals under normal body-temperature contact. No recalls or independent testing indicating migration of adhesive chemicals from U by Kotex pads have been published.
How is this PFAS grade calculated?
The brand's record and disclosure
Kotex (owned by Kimberly-Clark) does not publicly disclose ingredient lists or chemical certifications for this product line on their website, which is typical for the category but limits transparency. The brand has no recorded recalls specific to chemical contamination or toxicological incidents for period pads. No third-party testing results or safety certifications (e.g., Cradle to Cradle, Standard 100 by OEKO-TEX) are marketed for this product, suggesting no premium safety claims are being made.
How it compares in its category
U by Kotex Ultra Thin sits in the mainstream, mass-market segment. Brands marketed as organic, fragrance-free, or hypoallergenic pads sometimes disclose more ingredient detail or carry additional certifications; U by Kotex does not emphasize these attributes. The material composition (cellulose and polyethylene) is identical to most conventional pads in this category, including store brands, so chemical profile is not a differentiator. Fragrance and additives are the primary variables; this product does not list added fragrances, which lowers contact allergen risk versus scented alternatives.
If you buy it
Store pads in a cool, dry place to prevent moisture ingress or degradation of the adhesive backing. Replace pads every 4-8 hours during use to minimize bacterial growth and odor; prolonged wear increases risk of vaginal irritation regardless of pad chemistry. Discontinue use and consult a healthcare provider if persistent itching, rash, or unusual discharge occurs, as these may indicate contact sensitivity or infection unrelated to the product itself. Do not use if packaging is visibly torn or contaminated.
What is not known about PFAS in this product?
- Basis
- Model estimate, 70% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- U by Kotex has made a specific claim
Formulations change between production runs, so check the current label. How we grade.
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