Formaldehyde
A preservative and resin ingredient that is also released slowly by a group of chemicals used in its place. The preservatives that release it appear under names that do not contain the word, so a label can be free of formaldehyde and still give it off. It is classified as a known human carcinogen.
Definition and health context from NCI.
We checked 11,795 products and found formaldehyde reported or likely in 37 of them.
Where formaldehyde turns up
Categories we grade, worst first, as a share of what we scored in each.
| Category | Flagged | Scored | Share |
|---|---|---|---|
| Wrinkle-Free Dress Shirts | 15 | 16 | 94% |
| Recliners | 12 | 15 | 80% |
| Clothing | 7 | 9 | 78% |
| Jewelry Boxes | 13 | 17 | 76% |
| Couches | 65 | 89 | 73% |
| Curtains | 11 | 15 | 73% |
| School Uniforms | 53 | 78 | 68% |
| Stain-Resistant Professional Workwear | 52 | 78 | 67% |
| Stain-Resistant Suits | 10 | 15 | 67% |
| Hiking Shoes | 10 | 15 | 67% |
| Wrinkle-Free Professional Workwear | 10 | 15 | 67% |
| Stain-Resistant Jeans | 10 | 15 | 67% |
| Waterproof Boots | 63 | 105 | 60% |
| Stain-Resistant Bed Sheets | 9 | 15 | 60% |
Where we found real evidence
Reported or likely, lowest scoring first. Not plausibility.
Chrome-tanned leather (standard in athletic footwear) and synthetic leather finishes often contain formaldehyde-releasing preservatives and cross-linking resins. Off-gassing is highest during the first 1-2 weeks of wear but persists at lower levels.
Non-iron cotton finishes almost universally use formaldehyde-based resins or similar cross-linkers. Residual formaldehyde can off-gas during wear and wash cycles, particularly with heat. New garments typically have the highest off-gas load; washing reduces but
Non-iron dress shirts commonly use formaldehyde-based or formaldehyde-releasing resins; Brooks Brothers does not disclose which chemistry is used. Residual formaldehyde can off-gas especially when new and during hot washing or tumble-drying.
Non-iron cotton-blend dress shirts rely on formaldehyde-based resins to bond wrinkle resistance to fibers. Banana Republic does not disclose resin type or formaldehyde concentration, making this a probable but unconfirmed hazard for this specific product.
Wrinkle-free cotton finishes almost universally employ formaldehyde-based cross-linking resins. Off-gassing is highest immediately after manufacture and decreases with repeated laundering; new unwashed shirts may release detectable formaldehyde vapors.
Cotton-synthetic blends with durable-press finishing release low-level formaldehyde, documented in dermatology and textile chemistry literature. Reebok does not specify resin type or formaldehyde content limits. Emissions decline with repeated washing but pers
Wrinkle-free treatments on cotton often use formaldehyde-based resins (e.g., methylol compounds) that release low levels of formaldehyde during wear and washing. New garments may off-gas formaldehyde; this dissipates with laundering but can cause mild irritati
Wrinkle-resistant finishes commonly use formaldehyde-based resins (e.g., methylol compounds). Arrow does not disclose the finish type. New shirts may off-gas formaldehyde; washing reduces this significantly. Individuals with sensitivity may experience skin irr
Durable press finishes on cotton commonly use formaldehyde-releasing compounds. Low residual formaldehyde is expected in commercial products and typically decreases with washing, but sensitive individuals or those in very frequent skin contact may experience i
Wrinkle-free finishes universally rely on formaldehyde donors that cross-link to fiber cellulose. Initial off-gassing is highest in the first few washes; levels decline but may persist. Exposure is dermal and respiratory during wear and laundering.
Polyester ski jacket fabrics almost universally use formaldehyde-based resins to set wrinkles and maintain shape during manufacturing and washing. Residual formaldehyde can off-gas, especially on first wears and after hot washing; this is not unique to Wedze b
Polyester textiles routinely use formaldehyde-based dyes and wrinkle-resist finishes. This tent's manufacturer process is not disclosed, but formaldehyde exposure from new fabric is a recognized concern in the category, especially in enclosed spaces. Off-gassi
What to buy instead
Highest scoring products with no flag for it, in the categories where it is worst.
How to spot formaldehyde yourself
What is actually visible to someone holding the product, which for most of these is the only check available.
- Rarely named directly. Look instead for the preservatives that release it slowly.
- DMDM hydantoin, quaternium-15, imidazolidinyl urea, diazolidinyl urea and bronopol.
- "Formaldehyde-free" on a hair product does not rule out a releaser, and heat is what liberates it.
- A strong chemical smell from new composite wood furniture, which is off-gassing and fades long before emission stops.
Where it turns up outside our data
Hair smoothing and straightening products, nail hardeners, shampoos and washes through releasers, composite wood furniture, and permanent-press fabric finishes.
What the rules actually say
Classified as a known human carcinogen by the National Toxicology Program and IARC. Composite wood is limited under California CARB Phase 2 and federally under TSCA Title VI. Cosmetics are a different story: the FDA proposed a ban on formaldehyde and releasers in hair smoothing products, and the substance remains permitted in other personal care.
Read alongside NCI and our state by state guide to PFAS bans.
Answers about formaldehyde, with every source linked
The other chemicals we screen for
Every product here is checked against all of these, so a product that clears formaldehyde may still be flagged for one of them.
Common questions
What is formaldehyde?
A preservative and resin ingredient that is also released slowly by a group of chemicals used in its place. The preservatives that release it appear under names that do not contain the word, so a label can be free of formaldehyde and still give it off. It is classified as a known human carcinogen.
Which products contain formaldehyde?
Of the 11,795 products we have graded, 1,748 are flagged for it and 37 on reported or likely evidence rather than plausibility. Wrinkle-Free Dress Shirts is the worst category at 94% of what we scored there.
Is formaldehyde in wrinkle-free dress shirts?
More than in anything else we grade. 15 of the 16 wrinkle-free dress shirts we scored carry a flag for it, which is 94%. The full breakdown per product is on each product page.
What can I buy instead?
In the categories where it turns up most, the highest scoring products with no flag for it are Helzberg Diamonds Empty Necklace Box at 85, Helzberg Diamonds Presentation Boxes - 2 Earrings/necklace Box Empty at 85, Helzberg Diamonds Lili Jewelry Box at 85. Every one of those was graded on the same rubric as the products above.
How can I tell if a product has formaldehyde in it?
Rarely named directly. Look instead for the preservatives that release it slowly. DMDM hydantoin, quaternium-15, imidazolidinyl urea, diazolidinyl urea and bronopol. "Formaldehyde-free" on a hair product does not rule out a releaser, and heat is what liberates it. It turns up in hair smoothing and straightening products, nail hardeners, shampoos and washes through releasers, composite wood furniture, and permanent-press fabric finishes.
Is formaldehyde banned?
Classified as a known human carcinogen by the National Toxicology Program and IARC. Composite wood is limited under California CARB Phase 2 and federally under TSCA Title VI. Cosmetics are a different story: the FDA proposed a ban on formaldehyde and releasers in hair smoothing products, and the substance remains permitted in other personal care.
How do you know?
We do not lab test. Every grade here is built from published ingredient lists, materials, certifications, brand disclosures, recalls and third party lab results where those already exist. Where a product has been independently tested we use that result and say so, and where a brand publishes nothing we score the silence rather than guessing.
15% of everything we grade carries a flag for formaldehyde. See every hazard we track or browse the full products list.
Graded picks you can buy today
The safest product we have graded in each of our biggest categories.
- VOSS VOSS stillExcellent 100/100Check price
- Nikwax Nikwax Conditioner for LeatherExcellent 100/100Check price
- Blazing Needles 74 in by 19 in Outdoor Solid Polyester Tufted Chaise Lounge CushionExcellent 85/100Check price
- Nike Nike PD SoftExcellent 85/100Check price
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