Sigma · Waterproof Camera & Lens Protection Cases
Sigma WR UV Filter
Lower concern optical filter; no known PFAS-prone components identified.
This filter uses UV-absorbing optical glass or mineral coating. No evidence exists of Teflon-type coating, water-resistant, or other PFAS-typical treatments in standard camera filter design.
We flunk more products than we pass. This one earned its grade. How we grade
Material
UV-absorbing optical glass or mineral coating
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
Optical coating degradation and microabrasion
The WR hydrophobic and anti-reflection coatings will degrade with use and improper cleaning. Physical wear does not release hazardous particles in normal handling, but heavily damaged coatings may shed microscopic glass-oxide material; risk is negligible for camera equipment.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Lead
High-quality optical glass for UV filters typically uses lead-free formulations in modern production. No public testing or recalls of Sigma WR filters for heavy metal content have been documented.
Source, ATSDR ↗Chemical leaching from lens contacts
The filter does not contact food, skin, or liquids in normal use. Optical coatings are cured during manufacture and do not leach solvents or reactive compounds into the air or onto camera bodies.
Volatile organic compound (VOC) off-gassing
UV filters are passive glass components with no adhesives, resins, or polymers that off-gas. The mineral coating and optical treatment are thermally and chemically inert under ambient conditions.
The full breakdown
What it's made of and why it matters
The Sigma WR UV Filter uses UV-absorbing optical glass or a mineral-based coating formulated to block ultraviolet light while transmitting visible wavelengths to camera sensors. These materials are chemically stable, non-volatile, and do not leach or off-gas under normal use. The filter is optically coated (likely with titanium dioxide or similar compounds) to reduce reflections; such coatings are thermally and chemically inert when applied to glass substrates.
The brand's record and disclosure
Sigma is a Japanese optics manufacturer with a long history in camera equipment; no public safety recalls, material disclosures, or chemical controversies have been established for their filter line. The company does not publicly discuss material sourcing or hazard certifications for filters, typical of the optical accessories sector. No third-party testing or adverse event reports specific to Sigma UV filters appear in consumer safety databases.
How it compares in its category
UV filters are lower concern camera accessories because they are passive optical components with no electrical, thermal, or contact exposure. Sigma's WR (Water Repellent) line uses a hydrophobic surface treatment, standard across premium filters and posing no known health risk. Compared to protective filters from other brands, Sigma's products show similar toxicological profiles; differences lie in optical quality and coating durability, not hazard assessment.
If you buy it
Handle with lens-cleaning cloth or blower to avoid fingerprints and scratches that degrade the coating. Store in a dry place away from extreme temperatures; optical coatings are stable but unnecessary heat or moisture exposure can reduce water-repellent performance. Clean with distilled water and microfiber cloth if needed; avoid solvents. Replace if the coating becomes visibly scratched or if water no longer beads on the surface, typically after several years of regular use.
What we don’t know
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Sigma has made none
Formulations change between production runs, so check the current label. How we grade.
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.