Ruby Cup · Menstrual Cups
Ruby Cup Steriliser
Lower-concern menstrual cup sterilizer; stainless core typical for appliances, but silicone/plastic parts unspecified, contact brand for material detail.
Ruby Cup's electric sterilizer uses a stainless steel heating chamber, a material category with lower PFAS risk. However, the brand provides no public disclosure on any silicone or plastic component coatings, which could theoretically include water-repellent treatments. No lab data or third-party verification is available.
Shop Ruby Cup on Amazon →Material
Stainless steel heating chamber with silicone/plastic components
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.
Uncoated safe material
Bare, uncoated material (cast iron, stainless, carbon steel, or glass) with no surface treatment to contain PFAS.
The full breakdown
What it's made of and why it matters
The Ruby Cup Steriliser uses a stainless steel heating chamber, which is chemically inert and does not leach metals into water or steam. Silicone and plastic components (lid, controls, seals) are present but unspecified by the brand in public materials; food-grade silicone is standard in menstrual cup sterilisers and resists degradation from repeated heat cycles, but Ruby Cup has not published material certifications or heat-resistance specs. The stainless steel core is the primary contact surface with the cup and water, making it a lower-risk design compared to plastic-bodied steamers.
The brand's record and disclosure
Ruby Cup is a UK-based menstrual cup brand with a social mission focus (donating cups to lower-income countries) but minimal published safety documentation or third-party certifications on their steriliser product. The brand does not publicly disclose material testing, chemical sourcing, or responses to PFAS concerns in menstrual products generally. No safety recalls, regulatory actions, or independent safety testing of this steriliser have been identified in publicly available sources.
How it compares in its category
Electric steam sterilisers for menstrual cups typically use stainless steel or polypropylene heating chambers; stainless is the safer choice because it avoids plastic leaching during heat cycles. Ruby Cup's design is comparable to mid-range sterilisers (e.g., OrganiCup's steriliser, Intimina) in using metal cores, though those brands often publish more detailed material claims. The Ruby Cup Steriliser does not appear to use non-stick coatings (Teflon-type coating/Teflon), reducing Teflon-type coating fume risk during heating.
If you buy it
Use distilled or filtered water to reduce mineral buildup on stainless steel over time. Do not exceed manufacturer temperature or cycle duration recommendations, as silicone seals can degrade if exposed to sustained high heat; verify max operating temperature in the manual (typically 100 degrees Celsius for steam sterilisers). Replace silicone gaskets every 1-2 years or if visibly worn, cracked, or losing flexibility, as compromised seals may allow water pooling. Clean the heating chamber regularly to prevent mineral deposits that can reduce efficiency.
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/plastic component degradation
Silicone seals, gaskets, and plastic controls are exposed to repeated heating; without material specs or temperature limits published by Ruby Cup, long-term durability and leaching risk cannot be verified. Food-grade silicone typically resists degradation, but confirmation is absent from brand documentation.
Mineral or bacterial buildup in water chamber
Stainless steel sterilisers require regular descaling and water changes to prevent mineral deposits and microbial growth if water sits between uses. Ruby Cup does not provide detailed maintenance protocols in public materials, increasing risk of inadequate cleaning.
Leaching from unspecified plastic/silicone parts
No testing or reports of BPA, BPS, or phthalates from Ruby Cup Steriliser components have been identified. However, the brand's silence on material sourcing and certifications (e.g., FDA food-contact approval) leaves a gap in assurance.
Steam or thermal damage to menstrual cup
Overheating silicone cups or exposure to sustained high temperatures during sterilisation can cause material degradation; Ruby Cup's steriliser design appears standard, but lack of published guidelines on cup compatibility or temperature limits creates user error risk.
Formaldehyde or off-gassing from plastic housing
No reports or testing data suggest formaldehyde in the Ruby Cup Steriliser housing. Stainless steel and food-grade silicone do not typically off-gas formaldehyde, but unverified plastic components are not ruled out without material testing.
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.
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
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.