STAINMASTER Asher Toasted Oat Brown 39-oz sq yard Solution-dyed polyester Textured Indoor Carpet one_size
Stain-resistant carpet likely treated with PFAS; brand silent on chemistry.
STAINMASTER carpet uses stain-resistant treatment, historically PFAS-based in similar products. Interface discloses no PFAS information. Actual composition unconfirmed without independent testing.
The safe swap
Rug Doctor
Rug Doctor X3 Commercial Carpet Cleaner Pro Oxy Pack
75/100 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
Solution-dyed polyester with stain resistance treatment
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
Waterproof / stain-resistant treatment
water-repellent coating treatments have historically used PFAS.
Category baseline
furniture is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
PFAS
Solution-dyed polyester carpets with stain resistance are conventionally treated with PFAS compounds; Interface has not disclosed the chemistry of its STAINMASTER treatment, making PFAS presence highly probable but unconfirmed by the brand.
Source: ATSDR ↗Volatile organic compounds (VOCs) from backing and adhesives
New carpet installation typically releases VOCs from latex backing, adhesives, and dyes for 48-72 hours; this is a general carpet hazard, not specific to STAINMASTER formulation, but is manageable with ventilation.
What’s reassuring
Formaldehyde / VOCs
Solution-dyed polyester carpets do not inherently contain formaldehyde resins; no specific reports link Interface STAINMASTER products to formaldehyde off-gassing beyond typical new-carpet VOC emissions.
Source: ATSDR ↗Heavy metals
Solution-dyed polyester uses dyes integrated into the fiber; no specific safety alerts or recalls exist for STAINMASTER regarding azo dyes or heavy metal contamination in the color itself.
Source: FDA ↗Flame retardants
No public disclosure or industry reporting indicates that STAINMASTER Asher contains added flame retardants beyond standard polyester fiber combustion properties; most residential carpet does not require added flame retardants.
Source: EPA ↗The full breakdown
What it's made of and why it matters
STAINMASTER Asher is solution-dyed polyester, meaning the color is built into the fiber itself rather than applied as a surface coating, which reduces some degradation risks. The "stain resistance treatment" is the critical unknown: Interface has not publicly disclosed the chemistry of their proprietary stain-guard formula, but solution-dyed polyester carpets with stain resistance are typically treated with fluorochemicals (PFAS compounds) to repel water and oil-based soils. Solution-dyed polyester itself is chemically stable and does not leach significant heavy metals or problematic additives in normal conditions.
The brand's record and disclosure
Interface is a major carpet manufacturer with certification for environmental programs (e.g., ISO 14001, participation in circular economy initiatives), but has maintained silence on PFAS content and stain-treatment chemistry across its product line. The company has not issued public commitments to phase out PFAS in carpet treatments or provide ingredient transparency for stain-resistant products. This silence is notable given that many competitors (e.g., some European manufacturers) now disclose or offer PFAS-free alternatives, and given regulatory pressure in states like California and Washington on PFAS in textiles.
How it compares in its category
Solution-dyed polyester is a standard, durable carpet material and is safer than solution-dyed nylon in terms of leaching risk. The stain-resistance feature is common in mid-to-premium residential carpet; most competitive products (Mohawk, Shaw, Beaulieu) also use undisclosed fluorochemical treatments, making Interface typical rather than exceptional on PFAS risk. Brands explicitly offering PFAS-free stain treatments remain rare; wool and untreated polyester alternatives eliminate PFAS but sacrifice stain convenience or durability.
If you buy it
Ventilate well during and 48 hours after installation to reduce VOC off-gassing from backing adhesives (a concern for all new carpet, not specific to this product). Do not expose to sustained heat above 85°C (185°F), which is not a practical risk in homes but matters if considering this for commercial kitchens. Regular vacuuming and prompt spot-cleaning with water or mild detergent will maintain stain resistance without reapplication. If you are concerned about PFAS exposure, especially in homes with young children or in high-use areas, contact Interface directly to request PFAS content data before purchase, or consider untreated polyester or wool alternatives.
What we don’t know
- Basis
- Model estimate, 45% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Stainmaster has made none
Formulations change between production runs, so check the current label. How we grade.
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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.