Ghostek · Waterproof Smartphone Cases
Ghostek Galaxy S25 Ultra Waterproof Case MagSafe — Nautical Slim
Waterproof case coating composition undisclosed; PFAS risk unclear.
Ghostek does not disclose waterproofing treatment materials for this case. Typical phone case coatings may contain PFAS; no public lab testing or brand PFAS claim found.
The safe swap
Mophie
Mophie Juice Pack Battery Case for iPhone 15
85/100 safety
Same rubric that flunked this product. The swap earned its B.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Polycarbonate/TPU blend, waterproof coating unspecified
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Waterproof / stain-resistant treatment
water-repellent coating treatments have historically used PFAS.
Category baseline
other is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
This case combines polycarbonate (hard plastic shell) with thermoplastic polyurethane (TPE) (flexible bumper), both established polymers with no known intrinsic toxicity at consumer contact levels. The critical unknown is the waterproof coating applied to achieve water-resistance; Ghostek does not disclose its composition publicly. Waterproof coatings on textiles and plastics are common sources of PFAS (PFAS "forever chemicals") because fluorine chains repel water and oil effectively. Without ingredient transparency, the coating's safety profile cannot be independently verified.
The brand's record and disclosure
Ghostek does not publish material safety data sheets or chemical disclosures for this product line. The company has no documented certifications (e.g., Cradle to Cradle, ISO 14001) or public commitment to PFAS avoidance. No major safety recalls or legal actions specific to Ghostek cases are on record, but the absence of transparency is itself a limiting factor. For a product marketed as waterproof, ingredient silence is a red flag given regulatory and consumer scrutiny of PFAS in water-resistant goods.
How it compares in its category
Phone cases in this price tier (typically USD 20-50) rarely disclose waterproof coating composition; most brands are silent. However, competitors like OtterBox and Spigen have begun responding to PFAS concerns with public statements or PFAS-free claims, setting an emerging market standard. Ghostek's Nautical Slim case is thinner and lighter than typical rugged alternatives (e.g., OtterBox Defender), which trades durability for portability but provides less margin for coating degradation over time. The MagSafe integration is standard in this category and does not raise additional safety concerns.
If you buy it
Avoid prolonged contact between the case interior and skin, especially during hot weather or after water exposure, in case the coating sheds or releases volatile compounds. Do not intentionally submerge the case or phone for extended periods beyond the advertised IP rating (verify the exact rating with Ghostek, as it is not stated in your product description). Inspect the case quarterly for cracks, peeling, or white deposits on the TPU, which may indicate coating breakdown. Replace the case if visible degradation occurs or if you develop skin irritation near contact areas.
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.”
PFAS in waterproof coating
Coating composition undisclosed; fluorine-based water repellents are industry standard in waterproof phone cases and are a documented PFAS exposure route. Risk severity depends on coating type, which Ghostek has not revealed.
Polycarbonate degradation and leaching
Polycarbonate itself does not leach BPA under normal consumer use or phone contact. Risk arises only if case is heated, scratched deeply, or exposed to strong solvents; none are typical for phone case use.
TPU degradation and off-gassing
TPU can release volatile organic compounds (VOCs) and odors, especially in new cases or warm conditions. This is cosmetic rather than acutely toxic but may indicate polymer breakdown that could eventually affect waterproof integrity.
Coating particulate shedding
Wear, UV exposure, or thermal cycling can cause waterproof coating to flake or chip. If coating contains PFAS, inhalation or ingestion of particles during removal or cleaning is a theoretical but unquantified risk.
Microplastic generation from TPU
TPU does shed microparticles under friction or abrasion over months or years, but the amount released from a phone case into personal use (hand contact, pocket) is negligible compared to industrial or washing-machine sources.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 45% 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 Waterproof Smartphone Cases
Mophie
Juice Pack Battery Case for iPhone 15
Lithium-ion battery, plastic housing, metal contacts
No known PFAS use; battery cases rarely require fluorinated coatings.
⚠Brand says nothing about PFAS
Mophie
Juice Pack Battery Case for iPhone 15 Pro
Lithium-ion battery, plastic housing, rubber grips
Lower concern. Battery cases lack typical PFAS-prone coatings; no public disclosure available.
⚠Brand says nothing about PFAS
Pelican
Shield Phone Case for Samsung Galaxy S24 Plus
Polycarbonate shell, rubber grip
Lower concern; typical phone case with no known PFAS applications.
⚠Brand says nothing about PFAS
More waterproof smartphone cases 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.