The Lab
Specimen No. 0163
CautionSyntheticpreservativematerial

Formaldehyde (Textile Finishing)

dmdheu · dimethylol dihydroxyethylene urea · wrinkle-resistant resin

Formaldehyde-releasing resins (primarily DMDHEU) are applied to cotton and polyester blends to create wrinkle-free and no-iron finishes. The resins off-gas free formaldehyde — a known carcinogen (IARC Group 1) — especially during initial use. Regulatory limits range from 15–330 ppm depending on the country and end use.

high confidence
Researched April 18, 2026

Concerns

  • Releases free formaldehyde — IARC Group 1 human carcinogen
  • Causes allergic contact dermatitis and skin sensitization
  • Highest risk with new garments; washing reduces residual levels significantly
  • Infant clothing standards are strictest (15 ppm in Japan)

Regulatory flags

  • IARC Group 1 carcinogen
  • Japan restricts formaldehyde in textiles — ≤75 ppm adults, ≤20 ppm children
  • EU REACH restricts articles releasing formaldehyde

Commonly found in

Wrinkle-free shirtsNo-iron beddingPermanent-press clothingSome synthetic blends

Research disclaimer: This rating is based on available peer-reviewed research and regulatory assessments at the time of publication. It is not medical advice. Consult a qualified professional for personal health or skin concerns.

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