Ruby Cup · Menstrual Cups
Ruby Cup Menstrual Cup Medium / Red
Lower-concern choice; medical-grade silicone is not a known PFAS vector, though brand offers no explicit assurance.
Ruby Cup is made from medical-grade silicone, a non-Teflon-family coating material not typically associated with intentional PFAS use. The brand does not publicly disclose PFAS testing or make claims about PFAS-free status.
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 made of medical-grade silicone, a synthetic polymer that is chemically inert and resistant to degradation under normal vaginal temperatures (around 37°C). Medical-grade silicone does not rely on plasticizers like BPA or phthalates, nor does it break down into microplastics during typical use. The red colorant is integrated into the silicone matrix itself rather than applied as a coating, reducing leaching pathways for heavy metals in pigments.
The brand's record and disclosure
Ruby Cup publishes material safety documentation and explicitly states use of medical-grade silicone, though the company does not provide third-party test certificates or specify silicone sourcing. No product recalls or safety complaints have entered the public record. The brand is transparent about washability and reusability but offers no explicit PFAS assurance statement, which is typical for menstrual cup manufacturers across the board.
How it compares in its category
Menstrual cups made from medical-grade silicone (like Ruby Cup, Lunette, Diva Cup) carry significantly lower chemical exposure profiles than disposable pads and tampons, which may contain undisclosed fragrances, chlorine residue, and plastic microfiber shedding. Silicone cups avoid the formaldehyde-release glues and adhesive allergens present in many pad designs. Ruby Cup is priced mid-range and materials are comparable to competitors; the main advantage is reusability over decades, not material superiority.
If you buy it
Wash thoroughly with unscented soap before first use and after each cycle; do not use bleach, perfumed soaps, or oil-based lubricants, which can degrade silicone over time. The cup tolerates boiling (100°C) for sanitization and is not damaged by normal menstrual temperatures. Replace if the silicone develops persistent stains that cannot be cleaned, visible tears, or cracks, typically after 5-10 years of use. Store in a breathable bag to prevent moisture trapping and mold growth.
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 / leeching under acidic conditions
Medical-grade silicone is chemically stable at physiological pH and temperature. No peer-reviewed studies document leaching of silicone oligomers or degradation products from vaginal cups under normal use conditions.
Microbial growth and biofilm if poorly maintained
Any reusable menstrual device carries risk of bacterial or mold colonization if not dried completely between cycles or stored in damp conditions. Ruby Cup instructions address this, but user error remains a concern; improper storage increases risk of vaginal infection.
Allergic contact dermatitis to silicone additives
Medical-grade silicone formulations typically exclude common allergens, and silicone cup allergy is extraordinarily rare. No published case reports of allergic reaction to Ruby Cup or similar silicone cups exist in the medical literature.
Colorant stability and potential heavy metal pigment migration
Ruby Cup does not disclose which colorant system is used in red silicone (organic dye vs. mineral pigment). Medical-grade silicone color integration generally prevents migration, but brand does not publish pigment testing or heavy metal assay results.
Unintended device retention and insertion-related trauma
This is a general menstrual cup hazard unrelated to materials: improper insertion, size mismatch, or difficulty removal can cause vaginal scratching or cervical pressure. Ruby Cup medium sizing is appropriate for most adults, but sizing guidance should be followed carefully.
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.