King Arthur Baking Review, Is King Arthur Baking Non-Toxic?
Across 5 graded products, King Arthur Baking averages Poor (44/100). On disclosure, the brand says nothing publicly about PFAS. 2 of its products grade Good or better. Grades are model-based estimates, not lab results.
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.
Worth buying from King Arthur Baking Good or better, best-graded first
King Arthur Baking
King Arthur Bread and Pizza Stone
Carbon steel with food-grade mineral oil seasoning
Iron leaching
Carbon steel can release trace iron ions into food, especially acidic foods or liquids…
Rust and corrosion
If seasoning is stripped or maintenance is neglected, bare carbon steel will rust…
Thermal cracking or warping
Rapid temperature changes (e.g., placing a cold stone directly on a hot oven rack or…
Low-Medium risk. Seasoned carbon steel avoids PFAS-prone coatings.
⚠Starting grade for this product type
King Arthur Baking
Company Rolling Mat
Silicone mat
Silicone leaching (oligomers)
Food-grade silicone can release small cyclic oligomers at high heat (above 400°F) or in…
Thermal degradation / off-gassing
Silicone can emit a subtle odor when first heated or if used above safe temperature…
Microorganism growth
Deep creases or folds in silicone mats can trap moisture and harbor bacteria or mold if…
Rolling mat is silicone; lower PFAS concern.
⚠Starting grade for this product type
Graded and flagged Poor and Bad, we’d swap these
King Arthur Baking
Natural Half-Sheet Baking Parchment Paper
paper with silicone and/or wax coating
PFAS
Unspecified coating composition means non-fluorinated silicone or wax components could…
Coating degradation and particle shedding
Repeated use, creasing, or exposure to temperatures above manufacturer limits may cause…
Parchment paper coating origin unspecified; moderate PFAS risk remains uncertain.
⚠Waterproof or stain-proof treatment
King Arthur Baking
King Arthur Pre-Cut Natural & Unbleached Baking Parchment Paper
unbleached cellulose paper with silicone or mineral-oil-based release coating
Silicone or mineral oil coating stability at temperature
Unbleached Chef does not specify which release agent is used. Silicone-based coatings are…
Coating degradation and particle shedding
Repeated heating or mechanical damage can cause the release layer to flake or peel…
PFAS
While unbleached parchment is inherently lower-PFAS-risk than fluorinated non-stick…
Lower concern option, but no PFAS transparency; ask the brand directly.
⚠Waterproof or stain-proof treatment
King Arthur Baking
King Arthur Flour Precut Baking Parchment Paper Sheets
Cellulose with waterproof coating (type unspecified)
Fluorocarbon/silicone coating migration at heat
Unidentified waterproof coating on cellulose carries risk of leaching into fatty foods…
Thermal degradation and volatile emissions
All parchment coatings can emit low levels of volatile organic compounds (VOCs) when…
Coating adhesion loss and particulate shedding
Pre-cut sheets used repeatedly in convection ovens or with wet batters may shed…
Unlabeled food-contact compliance
No clear statement that this product meets FDA food-contact material regulations or EU…
Skip until PFAS status is disclosed or verified; parchment paper's silicone/fluorocarbon coatings are a known PFAS vector.
⚠Waterproof or stain-proof treatment
King Arthur Baking and PFAS, common questions
- Does King Arthur Baking have PFAS?
- We graded 5 King Arthur Baking products, averaging Poor (44/100). 2 grade Good or better. Grades are model-based estimates built from published materials, ingredients and disclosures, not lab tests.
- Is King Arthur Baking non-toxic?
- King Arthur Bread and Pizza Stone is the highest-graded King Arthur Baking product we have scored, at 75/100. It depends on the product line rather than the brand, so check the grade of the exact item you are buying.
- Which King Arthur Baking products are lower concern for PFAS?
- The highest-graded King Arthur Baking products we have scored are King Arthur Bread and Pizza Stone, King Arthur Baking Company Rolling Mat. That is our model-based estimate from materials and public disclosure, not a lab test.
- Which King Arthur Baking products should I avoid?
- The lowest-graded King Arthur Baking products we have scored are King Arthur Flour Precut Baking Parchment Paper Sheets, King Arthur Pre-Cut Natural & Unbleached Baking Parchment Paper, King Arthur Baking Natural Half-Sheet Baking Parchment Paper. Each one links to the evidence behind its grade.
Every grade uses the same public rubric. How grades work →