Ruby Cup · Menstrual Cups
Ruby Cup
Lower concern, silicone cup unlikely to contain PFAS, but brand is silent on sourcing.
Ruby Cup is a reusable menstrual cup made from medical-grade silicone, a material category not typically treated with Teflon-family coating or water-repellent coating coatings. The brand does not publicly disclose PFAS sourcing or testing.
Shop Ruby Cup on Amazon →Material
Medical-grade silicone
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
Ruby Cup is constructed from medical-grade silicone, a thermoset elastomer that does not degrade, leach, or off-gas under normal menstrual-use conditions (body temperature ~37°C, acidic vaginal pH 3.8, 4.5). Medical-grade silicone is inert by design and widely approved for prolonged internal contact in devices like implants and catheters. Unlike latex or lower-grade silicones, it is hypoallergenic and resistant to bacterial colonization on the surface.
The brand's record and disclosure
Ruby Cup provides no public third-party certifications (ISO 10993 biocompatibility testing results are not disclosed) and does not publish supplier transparency or manufacturing audits. The brand remains silent on PFAS use in coatings, inks, or production processes, which is a missed opportunity for differentiation in a category where competitors (e.g., Saalt, Lena) have begun publishing ISO 10993 data. No safety recalls or adverse event reports are documented for Ruby Cup in regulatory databases.
How it compares in its category
Menstrual cups occupy a narrow material space: silicone dominates, with latex and TPE alternatives available. Ruby Cup's silicone formulation is functionally identical to Diva Cup, Saalt, and Lena in terms of inertness; the key differentiation lies in brand transparency and third-party testing disclosure. Ruby Cup's lack of published biocompatibility testing is a weakness compared to brands that voluntarily share ISO 10993 reports, though absence of testing disclosure does not imply unsafe material.
If you buy it
Wash with soap and water before first use and after each cycle; do not boil above 100°C (silicone remains stable but unnecessary). Replace every 3, 5 years if no visible degradation occurs; inspect for tears, discoloration, or odor retention (signs of microbial biofilm, not toxicity). Store dry in the provided pouch; avoid prolonged contact with petroleum-based lubricants. If you experience irritation, allergic reaction, or odor that does not resolve with cleaning, discontinue use and consult a healthcare provider.
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.”
Silicone degradation and leaching
Medical-grade silicone does not hydrolyze, leach oligomers, or degrade under vaginal pH and temperature. No published reports of silicone-to-tissue transfer in cup users.
Bacterial biofilm and toxic shock syndrome (TSS)
Any menstrual cup poses a TSS risk if left in place >12 hours or if the wearer has a history of TSS; this is a product-category hazard, not specific to Ruby Cup. Proper cleaning and timely removal mitigate risk. No elevated TSS rate reported for Ruby Cup vs competitors.
Allergic contact dermatitis from silicone additives
Medical-grade silicone is hypoallergenic; vulvitis or vaginitis linked to menstrual cups is rare and usually attributable to inadequate cleaning or prolonged insertion. No published allergic reactions specific to Ruby Cup's formulation.
Inks and dyes on cup exterior
Ruby Cup uses printed branding on the cup exterior. Food-grade inks are standard in the category, but Ruby Cup does not disclose ink composition or migration testing under vaginal conditions, though direct contact with printed areas is minimal during typical use.
PFAS in manufacturing or packaging
Medical-grade silicone suppliers may use PFAS-based anti-fouling agents or Teflon-family coating coatings in production; Ruby Cup's silence on supply-chain PFAS use is a transparency gap. The finished cup is unlikely to contain residual PFAS, but brand accountability is absent.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 78% 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.
Safer alternatives in Menstrual Cups
Aisle
DIVA Cup Model 2
Medical-grade silicone (body); no Teflon-type coating or Teflon-family coating coatings
Lower-concern menstrual cup; silicone construction and PFAS-free commitment make it a reasonable choice.
✓Verified PFAS-free by a third party
Ruby Cup
Steriliser
Stainless steel heating chamber with silicone/plastic components
Lower-concern menstrual cup sterilizer; stainless core typical for appliances, but silicone/plastic parts unspecified, contact brand for material detail.
⚠Risky category by default
Ruby Cup
Steriliser Purple
stainless steel steriliser/heating element
Lower PFAS concern; no high-risk coatings typical of this product category.
⚠Risky category by default
More menstrual cups grades
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.