Ruby Cup · Menstrual Cups
Ruby Cup Reusable Menstrual Cup
Lower PFAS concern; menstrual cups are inherently low-risk, but lack explicit brand transparency.
Ruby Cup is manufactured from medical-grade silicone, a polymer material with no known PFAS risk in standard formulations. Menstrual cups do not require water-resistant or nonstick coatings, eliminating typical PFAS use cases.
Shop Ruby Cup on Amazon →Material
Medical-grade silicone (primary); no surface coatings reported
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, the same material used in clinical implants and medical devices. Medical-grade silicone does not contain BPA, phthalates, or other endocrine disruptors commonly found in lower-grade plastics. The material is inert at body temperature and does not leach into bodily fluids; it is designed to be biocompatible and non-reactive during prolonged internal contact. No surface coatings, glazes, or chemical finishes are applied to this product.
The brand's record and disclosure
Ruby Cup has not published detailed chemical safety certifications, third-party testing results, or explicit statements on manufacturing safety standards. The brand does not disclose PFAS testing or mitigation practices, which is notable given increasing consumer concern about "forever chemicals" in menstrual products. No product recalls or safety controversies have been documented for Ruby Cup in publicly available records. The company markets itself as social-impact focused but does not lead on chemical transparency.
How it compares in its category
Menstrual cups made from medical-grade silicone are considered lower-risk than disposable pads and tampons, which may contain bleach residues, dioxins, and fragrance chemicals. Other silicone cup brands (Lunette, DivaCup, Saalt) similarly lack exhaustive PFAS disclosure but share the same inherent material safety profile. Ruby Cup sits in the middle of the market on transparency; some competitors publish ISO certifications, while others remain equally opaque. The product category itself is among the safest in menstrual care due to silicone's non-leaching properties.
If you buy it
Wash with mild soap and water before each use and after menstruation; do not use harsh bleach or abrasive scrubbers, which can degrade the silicone surface over time. Boil for 5-10 minutes monthly or before first use to sanitize. Replace if silicone becomes sticky, cracked, or discolored, typically after 5-10 years of proper care. Store in breathable cloth or ceramic containers; avoid sealed plastic bags that can promote bacterial 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 from heat or chemical stress
Menstrual cups can develop surface stickiness or loss of elasticity if exposed to extreme heat, prolongine sun exposure, or incompatible cleaning agents. This is a functional rather than chemical hazard but can increase bacterial colonization risk if the seal fails.
Bacterial contamination from improper care or storage
The menstrual cup itself does not leach bacteria, but inadequate sanitization or storage in sealed non-breathable containers can create conditions for bacterial biofilm. This is a hygiene practice issue, not an inherent product defect.
Heavy metals or contaminants in silicone feedstock
No reports of lead, cadmium, or other heavy metals in Ruby Cup or comparable medical-grade silicone cups. The silicone polymer itself does not accumulate metals; contamination would require manufacturing failures. Ruby Cup does not disclose raw material sourcing or testing.
Fragrance or allergen additives
Ruby Cup contains no reported fragrance, dyes, or flavor additives that would trigger allergic or sensitization reactions. Medical-grade silicone is inherently odorless and hypoallergenic, though individual sensitivity to silicone itself is rare.
PFAS in manufacturing or packaging
While the silicone material itself is unlikely to contain PFAS, the manufacturing process or packaging materials may introduce PFAS. Ruby Cup does not test for or disclose PFAS content, leaving this exposure pathway unassessed.
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.