Sigma Review, Is Sigma Non-Toxic?
Sigma averages 72 out of 100 on PFAS Authority's PFAS and toxin screen across the 8 Sigma products graded as of November 2026, and 5 of them reach its 70 point pass mark.
Sigma grades Good on our four-band scale. On disclosure, the brand says nothing publicly about PFAS. See what every brand has published about PFAS for how that compares.
PFAS Authority is a scoring system, not a laboratory. We do not test products ourselves. Grades are model-based, built from published ingredients, materials, certifications, brand disclosures and third-party lab results where they exist. See the rubric.
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Top-graded picks in the categories readers replace first, every one scored on the same rubric.
- polypropylene filter housing, carbon/sediment cartridge
- We found no PFAS statement from the brand
- Bacterial growth in spent cartridges
3 hazards checked on this product, all on its full breakdown.
Aquasure
Premier Series 75 GPD Under Sink Reverse Osmosis Water Filtration System
- RO membrane, carbon filters, stainless steel housing
- We found no PFAS statement from the brand
- Bacterial and microbial growth in housing and filters
4 hazards checked on this product, all on its full breakdown.
Avocado
Vegan Mattress
- organic cotton, natural latex, coconut coir, recycled steel coils
- The brand calls it PFAS-free, which we have not verified
- Heavy metals
2 hazards checked on this product, all on its full breakdown.
Does Sigma have PFAS, by category
Which Sigma products are PFAS-free? Good or better, best-graded first
- Optical glass, aluminum frame, non-coated optical surfaces
- We found no PFAS statement from the brand
- Optical glass fragility and sharp edges. If dropped or cracked, borosilicate glass can fracture and create…
- glass optical element with metal frame
- We found no PFAS statement from the brand
- WR hydrophobic coating degradation. The water-repellent layer may degrade over 5-10 years with repeated…
- Fiberglass filter media with cellulose
- We found no PFAS statement from the brand
- Fiberglass fiber shedding. Fiberglass filters can release microscopic fibers during handling, installation…
3 hazards checked on this product, all on its full breakdown.
- UV-absorbing optical glass or mineral coating
- We found no PFAS statement from the brand
- Optical coating degradation and microabrasion. The WR hydrophobic and anti-reflection coatings will degrade…
- Unspecified filter media
- We found no PFAS statement from the brand
- Undisclosed filter media composition. Without public specification of active ingredients (carbon type, resin…
4 hazards checked on this product, all on its full breakdown.
Which Sigma products contain PFAS? Poor and Bad, we’d swap these
- Optical glass, aluminum frame, likely multi-coated lens elements
- We found no PFAS statement from the brand
- Glass breakage and sharp edges. Drops or impacts can shatter the filter glass, creating sharp fragments. Risk…
- Optical glass with unspecified multi-coatings
- We found no PFAS statement from the brand
- Multi-coat composition uncertainty. Sigma does not disclose the chemical identity of anti-reflective and…
- UV filter composition unspecified
- We found no PFAS statement from the brand
- Undisclosed active ingredient toxicity (organic UV absorbers). If this is a cosmetic UV filter using organic…
5 hazards checked on this product, all on its full breakdown.
Find an alternative on AmazonWhat to buy instead Good or better, in the categories Sigma sells
- 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.
- glass optical filters
- We found no PFAS statement from the brand
- Coating degradation or delamination
2 hazards checked on this product, all on its full breakdown.
Sigma and PFAS, common questions
- Does Sigma have PFAS?
- Sigma averages 72 out of 100 on PFAS Authority's PFAS and toxin screen across the 8 Sigma products graded as of November 2026, and 5 of them reach its 70 point pass mark. Grades are model-based estimates built from published materials, ingredients and disclosures, not lab tests.
- Is Sigma non-toxic?
- Sigma 58mm WR Protector Filter is the highest-graded Sigma product we have scored, at 85/100. It depends on the product line rather than the brand, so check the grade of the exact item you are buying.
- Which Sigma products are lower concern for PFAS?
- The highest-graded Sigma products we have scored are Sigma 58mm WR Protector Filter, Sigma 46mm WR Protector Filter, Sigma WR Protector Filter. That is our model-based estimate from materials and public disclosure, not a lab test.
- Which Sigma products should I avoid?
- The lowest-graded Sigma products we have scored are WR UV Filter SIGMA Corporation, Sigma 95mm WR Protector Filter, Sigma WR CPL Circular Polarizer Filter. Each one links to the evidence behind its grade.
Every grade uses the same public rubric. How grades work →