Google · Waterproof Personal Electronics Cases
MN-UN4 Universal Waterproof Case
Skip, waterproof coating composition undisclosed by Google.
Google's MN-UN4 waterproof case lacks material transparency. Waterproof treatments often use PFAS; no disclosure or testing available.
The safe swap
Rhinoshield
iPhone 17 Pro Max SolidX
100/100 safety
Same rubric that flunked this product. The swap earned its A.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Plastic case with waterproof coating, composition 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
The MN-UN4 is a plastic protective case with an unspecified waterproof coating. Without material composition disclosure from Google, it is impossible to determine if the base plastic is polycarbonate, polypropylene, TPE, or another polymer, each with different leaching profiles. The waterproof coating itself is the primary concern: typical waterproof finishes on consumer cases use either silicone-based, polyurethane, or Teflon-family coating (Teflon-type coating-family) treatments, and Google has not publicly identified which is used here.
The brand's record and disclosure
Google does not publish material safety datasheets or detailed composition data for the MN-UN4, which is standard for a tech accessory but limits independent hazard assessment. Google has faced PFAS scrutiny in its supply chain and has made limited public commitments to PFAS phase-out in consumer products. For this product, the silence on waterproof coating chemistry is the defining disclosure gap; no recalls or safety incidents are on public record for this specific model.
How it compares in its category
Waterproof cases are typically made from rigid or semi-rigid plastics with minimal chemical leaching risk during normal use, since they are designed to contain rather than contact food or skin. The MN-UN4 is a protective shell; risk is lower than cookware or food-contact plastics. However, many competing waterproof cases (from OtterBox, Spigen, Pelican) provide material composition or certifications (e.g., BPA-free statements), which Google does not offer for this product, placing it below industry transparency norms.
If you buy it
The case should not be used to store food, cosmetics, or items that contact skin for extended periods, as the coating chemistry is unknown. Avoid prolonged exposure to high heat (e.g., car dashboards in direct sun), which could accelerate coating breakdown and potential monomer leaching. Inspect periodically for cracks, peeling, or discoloration; replace if the waterproof seal visibly degrades. Rinse with plain water if exposed to salt water or harsh environments, and dry thoroughly to prevent trapped moisture.
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.”
Waterproof coating leachables
The waterproof treatment composition is not disclosed by Google. If polyurethane-based, hydrolysis under humid or warm conditions could release trace isocyanates or polyols; if Teflon-family coating-based, potential microplastic shedding exists. Risk is low during normal protective use but unknown without material data.
Plastic base polymer leaching
Undisclosed base plastic material; if polycarbonate, trace BPA is theoretically possible under stress or heat, though a protective case used only as a shell presents minimal contact exposure. No recalls or incidents on record for this product.
Coating degradation and microplastics
Extended UV exposure, temperature cycling, or physical wear could degrade the waterproof coating over months or years, potentially generating microplastics or exposing the underlying plastic. The lack of durability data from Google makes it unclear how long the seal remains intact.
Off-gassing or odor from manufacturing residues
New protective cases sometimes emit chemical odors from residual solvents or catalysts in coatings. No reports exist for the MN-UN4, but adequate ventilation on first use is prudent if any odor is detected.
PFAS in waterproof coating
Waterproof coatings frequently rely on PFAS chemistry (see separate PFAS grade: 40/100). Google's silence on coating composition means PFAS presence cannot be ruled out and is assessed separately as a material risk.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 35% 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 Personal Electronics Cases
Rhinoshield
iPhone 17 Pro Max SolidX
TPE/thermoplastic elastomer protective case
Phone case; typical TPE has low PFAS risk but no brand disclosure available.
✓Naturally PFAS-free material
Rhinoshield
iPhone 16 Pro SolidX
TPU, polycarbonate, and glass back
Phone case, lower concern for PFAS exposure risk.
✓Naturally PFAS-free material
Spigen
Cryo Armor Case for iPhone 15 Pro Max
TPU (thermoplastic polyurethane) bumper with polycarbonate back panel
Lower PFAS concern; standard phone case materials lack obvious PFAS indicators.
⚠Brand says nothing about PFAS
More waterproof personal electronics 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.