B+W · Waterproof Camera & Lens Protection Cases
B+W Master Clear Filter MRC Nano
Glass base reduces concern; nano-coating composition undisclosed by brand.
B+W Master Clear uses glass with a proprietary water-repellent nano-coating designed to shed water and dust. Coating chemistry stays unspecified and no PFAS disclosure or testing data is available.
The better-graded swap
Nanuk
Nanuk 909 Waterproof Hard Case for DJI Osmo Pocket 3
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
Glass with water-repellent nano-coating
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What B+W Master Clear Filter MRC Nano is made of, ingredients and materials
The B+W Master Clear is a glass optical filter with a proprietary water-repellent nano-coating (MRC Nano). The glass substrate itself is chemically stable and does not leach contaminants into food, water, or contact with skin. The nano-coating's exact composition is not disclosed by B+W; such coatings often rely on silane chemistry or Teflon-family coating to achieve water-beading properties, which introduces uncertainty around PFAS content (covered separately in your PFAS grade).
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.
Waterproof / stain-resistant treatment
Water-repellent coating treatments have historically used PFAS.
Coating degradation over time
Water-repellent nano-coatings on optics can degrade with prolonged UV exposure, humidity, or mechanical wear. B+W does not publish durability timelines; expected lifespan is typically several years with normal care. Degraded coating reduces function but does not create a direct safety hazard.
PFAS
Water-repellent nano-coatings commonly use fluorochemistry; B+W has not confirmed or denied PFAS use. As a camera filter in non-food applications, exposure to humans is negligible unless coating degrades and particles are inhaled or ingested, which is not a standard use scenario.
Source, ATSDR ↗What’s reassuring
Nano-coating leaching or off-gassing
No reports of optical filter nano-coatings leaching into skin, water, or air under normal use. Glass does not off-gas; the coating risk is mainly if mechanically damaged or exposed to extreme heat (far outside intended use as a camera filter).
Heavy metals
Optical glass from reputable manufacturers is formulated to avoid lead and cadmium; B+W is ISO-certified for optical products. No independent testing or recalls suggest contamination. The nano-coating composition is undisclosed but is not in contact with consumables.
Source, FDA ↗Microabrasion or particle shedding from coating
Well-bonded nano-coatings do not shed particles during normal use. Damage (scratching, chipping) could theoretically release coating fragments, but this is a durability issue, not a chemical hazard, and would be immediately visible.
How is this PFAS grade calculated?
The brand's record and disclosure
B+W (a division of Schneider Optics) has not published transparency reports on nano-coating chemistry or PFAS use in their optical coatings. No safety recalls, contamination incidents, or independent lab findings of hazardous substances in B+W filters are on public record. The brand's silence on coating composition limits independent verification but does not indicate a known problem.
How it compares in its category
Optical filters (camera, lighting) are a minor-exposure category compared to cookware or food packaging. Glass-based filters with hydrophobic coatings are standard across the industry; B+W is a market leader. Uncoated glass filters exist but offer less water resistance. The MRC Nano coating is competitive in durability but introduces the nano-material unknowns that define this product's risk profile.
If you buy it
Handle with care to avoid scratching the nano-coating, which can reduce performance. Clean with lens cloth or mild soap and distilled water; avoid harsh solvents that might degrade the coating. The coating should remain stable during normal storage and use at room temperature. Replace only if optical clarity degrades or coating delamination becomes visible; the filter itself has no expiration.
What is not known about PFAS in this product?
- Basis
- Model estimate, 45% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- B+W has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to B+W Master Clear Filter MRC Nano?
- 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.