Ruby Cup · Menstrual Cups
Ruby Cup Steriliser Purple
Lower PFAS concern; no high-risk coatings typical of this product category.
The Ruby Cup Steriliser is a heat-based menstrual cup steriliser with stainless steel construction, a material not associated with PFAS use. The brand makes no PFAS claims and public product information lacks details of problematic coatings.
Shop Ruby Cup on Amazon →Material
stainless steel steriliser/heating element
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 and electrical element to heat water for sterilizing menstrual cups. Stainless steel is chemically inert at the temperatures typical for cup sterilization (around 100°C) and does not leach metals or require protective coatings that can degrade. Unlike ceramic or glazed cookware, stainless steel avoids the lead/cadmium-in-glaze and coating-breakdown hazards that complicate other heating appliances.
The brand's record and disclosure
Ruby Cup has not published detailed material safety datasheets or third-party certification summaries for this steriliser in publicly available sources. The brand maintains a sustainability focus and markets the product as part of a circular economy narrative around reusable menstrual products, but transparency on chemical composition and manufacturing standards is limited. No safety recalls or contamination incidents appear on record for this specific model.
How it compares in its category
Menstrual cup sterilisers are a niche product; most alternatives are either microwave bags (plastic/silicone risk), boiling pots (user-controlled, no leaching risk), or similar electric models. The stainless steel design places this device in the lower-risk subset of electrical sterilisers. Unlike some cheaper electric sterilisers that may use aluminum or low-grade steel interiors, the material choice here reduces leaching and longevity concerns.
If you buy it
Follow the manufacturer's water-fill instructions strictly; overfilling or using it without water can damage the heating element and create electrical hazards. Replace the device if the heating element corrodes visibly or if it fails to heat properly, as degraded electrical components carry shock risk. Descale periodically if you live in a hard-water area to prevent mineral buildup that can reduce efficiency. Store in a dry place to prevent any corrosion of the external casing.
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.”
Electrical safety (heating element corrosion)
Stainless steel resists corrosion well, but the internal heating element and electrical contacts can corrode over time if water is left standing or if hard-water minerals accumulate, creating shock or malfunction risk.
Leaching from stainless steel
Stainless steel is chemically inert at sterilization temperatures and does not leach iron, chromium, or nickel into boiling water at levels of public health concern; no reported issues for this product.
Plastic or silicone seals/gaskets degradation
The steriliser may contain rubber or silicone seals around the lid or water chamber. Repeated heating cycles can cause these to harden, crack, or release organic compounds; replacement of seals after 1-2 years of heavy use may be needed.
Formaldehyde or VOC off-gassing from insulation or labeling
No public reports of off-gassing from this model; stainless steel exteriors do not typically off-gas, but any plastic packaging or printed labeling should be removed and discarded before first use if concerned.
Heavy metal contamination in manufacturing
No recalls or test results on record showing lead, cadmium, or other heavy metals in the stainless steel body or water-contact surfaces for Ruby Cup sterilisers.
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.