Flex · Tampons
Flex Disc Annual Supply Sustainable Period Products
Lower PFAS concern for silicone disc, but brand offers no reassurance, verify materials directly if risk-averse.
Flex Disc is a reusable period disc made primarily from medical-grade silicone, a material with no inherent PFAS chemistry. However, the brand does not publicly disclose PFAS testing, certifications, or supply-chain transparency.
Shop Flex on Amazon →Material
Medical-grade silicone (primary); no disclosed coatings
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
period care is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
The full breakdown
What it's made of and why it matters
Flex Disc is constructed from medical-grade silicone, a synthetic polymer widely used in body-contact medical devices because it resists degradation and does not leach plasticizers like BPA or phthalates during normal use. Silicone does not require coating with Teflon-type coating (Teflon) or other fluorinated compounds for non-stick properties, unlike coated cookware. The material is inert at body temperature and does not off-gas volatile organic compounds (VOCs) under the low-stress, moisture-rich conditions of vaginal insertion.
The brand's record and disclosure
Flex has published basic material safety data sheets confirming medical-grade silicone composition and has not faced public recalls or safety violations related to chemical contamination. The company does not explicitly address PFAS content or commit to PFAS-free sourcing, leaving uncertainty about potential fluorinated processing aids or manufacturing residues. Third-party certifications (e.g., FDA clearance as a menstrual disc) confirm biocompatibility testing but do not independently audit PFAS levels. Transparency on supply chain and manufacturing facilities remains limited compared to leading personal-care brands.
How it compares in its category
Menstrual discs made of medical-grade silicone carry lower chemical leaching risk than single-use tampons with synthetic rayon-polyester cores, bleached fibers, or adhesive-coated applicators. Reusable silicone discs also eliminate concerns about microfiber shedding and microplastic accumulation in wastewater that plague disposable products. Compared to other reusable silicone menstrual products (cups, discs), Flex's design and material profile are broadly equivalent; the main differentiator is brand transparency rather than inherent safety.
If you buy it
Rinse and inspect the disc weekly for tears, discoloration, or odor that may signal microbial colonization or material breakdown; replace annually or sooner if integrity is compromised. Avoid prolonged exposure to extreme heat (boiling is safe for sterilization; prolonged contact with >80°C surfaces is not necessary). Store in a breathable pouch, not an airtight container, to prevent bacterial growth during off-cycle months. If you have latex sensitivity, confirm silicone-only construction with the seller, as some batches may include processing residues.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Bacterial overgrowth and toxic shock syndrome (TSS) risk
Reusable silicone discs, like all menstrual products, can harbor bacteria if not cleaned, dried, and stored properly; TSS risk is lower than for tampons but requires rigorous user maintenance. Flex provides care instructions, but adherence is user-dependent.
Silicone degradation and particulate leaching
Medical-grade silicone is chemically stable and does not degrade into microparticles under normal vaginal conditions or recommended cleaning protocols. No published incidents of silicone fragmentation or contamination in Flex Disc products.
Formaldehyde or formaldehyde releasers in fibers or coatings
Silicone does not require formaldehyde-based resins for curing or preservation; this hazard is not relevant to the primary material. Packaging materials are not specified in available disclosures.
Allergic contact dermatitis from material or additives
Medical-grade silicone is hypoallergenic for most users, but rare sensitivity or reactions to processing residues or trace additives cannot be ruled out. Flex does not disclose specific additives (e.g., colorants, antimicrobial agents) in the silicone formulation.
Undisclosed processing residues or water-based coatings
Although Flex states 'no disclosed coatings,' manufacturing residues from mold release agents or lubricants used during silicone injection molding are not routinely tested or reported. Request certificate of analysis from the manufacturer if chemical sensitivity is a concern.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
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How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.