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
Formaldehyde (Textile Finishing) molecular structure
Specimen 0163Formaldehyde (Textile Finishing)

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

Last researched: April 18, 2026

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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