Hoya · Waterproof Camera & Lens Protection Cases
Hoya UV filter HD MkII
Glass lowers concern, but coating details withheld.
This UV filter combines optical glass with anti-reflective coatings. Hoya discloses nothing about PFAS in the coating materials.
The better-graded swap
Nanuk
Nanuk 915 Pro Photo Kit
85/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Optical glass with multi-coated lens treatment
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Hoya UV filter HD MkII is made of, ingredients and materials
The Hoya UV filter HD MkII is optical glass with multi-layer anti-reflective coatings applied to both surfaces. The glass substrate itself is inert and does not leach chemicals into the environment or onto skin. The multi-coat treatment (likely containing silicon dioxide, aluminum oxide, and proprietary polymers) is mechanically bonded to the glass surface and sealed during manufacturing, meaning it does not shed particles or degrade through normal use as a passive optical element.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Unknown / proprietary coating
A coating is recorded with no disclosed chemistry.
Coating material composition (undisclosed polymers or resins)
Multi-layer anti-reflective coatings may contain PFAS-based polymers or other synthetic resins to improve durability, but composition is proprietary and not disclosed by Hoya. No leaching pathway exists under normal filter use (passive optical element, no water or food contact).
What’s reassuring
Lens surface degradation over extended storage
Optical coatings can degrade if exposed to extreme humidity, salt spray, or temperature cycling, but this affects optical performance, not chemical safety. No toxicological hazard from aged coatings has been documented.
Glass substrate fracture (mechanical, not chemical)
Impact or dropping the filter can crack or shatter the glass, creating sharp edges. This is a physical hazard, not a chemical one; the glass itself is non-toxic.
Heavy metals
Optical glass may contain trace lead or other metals as flux agents (industry standard), but these are locked into the glass matrix and do not leach. No public data indicates Hoya uses lead-heavy optical glass in consumer filters.
Source, FDA ↗How is this PFAS grade calculated?
The brand's record and disclosure
Hoya is a major Japanese optics manufacturer with no public record of chemical safety controversies or product recalls related to lens filters. The company does not proactively disclose coating chemistry or PFAS use in optical coatings, which is standard practice across the industry (most manufacturers treat this as proprietary). No independent testing of Hoya lens coatings for PFAS or heavy metals has been published in consumer safety databases.
How it compares in its category
Optical filters are a lower-risk category compared to cookware, textiles, or food storage because they do not contact skin, food, or water under normal use, and glass is chemically inert. Competing brands (B+W, Marumi, Tiffen) use similar multi-coat glass designs with equivalent disclosure practices. The HD MkII specifically includes hardened coatings to resist scratching, which may involve additional polymer layers but does not increase toxicological risk.
If you buy it
Store in a dry case to prevent moisture from degrading coatings over years of storage; avoid extreme temperature swings that could stress the glass-coating interface. Clean with microfiber cloth and lens-grade cleaner only, never abrasive materials. The filter itself requires no maintenance beyond occasional gentle cleaning and will not degrade chemically in normal use. If the coating becomes visibly scratched or peeling, it may lose optical performance but poses no safety hazard; replace if optical quality is critical.
What is not known about PFAS in this product?
- Basis
- Model estimate, 62% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Hoya has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to Hoya UV filter HD MkII?
- Optical glass lens with multi-coated optical surfaces
- We found no PFAS statement from the brand
- No PFAS statement found from the brand
- Glass lens (borosilicate or soda-lime glass)
- Optical coating degradation
2 hazards checked on this product, all on its full breakdown.
- Optical glass, aluminum frame, non-coated optical surfaces
- We found no PFAS statement from the brand
- Optical glass fragility and sharp edges
More waterproof camera & lens protection 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.