Carcinogenic chemicals in textiles: Risks, regulations, and safer alternatives

Where are carcinogens found in textile products?

Carcinogens may be introduced into textile products through chemicals used at various stages of fiber production, fabric processing, and finishing. Examples include: 

• Azo dyes – historically used to produce vivid colors, can release carcinogenic aromatic amines during degradation 
• Formaldehyde resins – used in wrinkle-resistant, shrink-proof, or “easy-care” finishes 
• Chromium (VI) compounds – used in some leather tanning processes and to stabilize color during the dyeing process 
• Benzidine-based dyes – once widely used for bright colors and still found in some imported goods 

Many of these substances also appear alongside other substances of concern in textiles, including chemicals that may not always be disclosed in finished products.

Many textile types are affected. Synthetic and dyed garments made from polyester, nylon, and acrylic use complex dye systems and finishing chemicals. Performance wear such as sportswear or outdoor gear is often treated with specialized coatings or colorants for durability and moisture resistance. Wrinkle-free or “easy-care” fabrics are often treated with formaldehyde-based finishes. 

Carcinogens may be introduced at several stages in the manufacturing process, including: 

• Pre-treatment: bleaching, scouring, and mercerizing using agents that may leave hazardous by-products 
• Dyeing: azo and benzidine-based dyes can introduce carcinogenic amines if not fully fixed to the fiber 
• Printing: use of pastes containing formaldehyde-based binders or harmful solvents 
• Finishing agents: wrinkle-resistant, water-repellent, flame-retardant, and antimicrobial treatments may introduce or release carcinogens 

Why carcinogens in textiles are a concern for companies

Carcinogenic ingredients in textiles present core risks to manufacturers and brands, including significant compliance and reputational risks because of the strict and varied regulations governing their use. Textile products are considered high risk because they come into close contact with the skin and may release residues that can be inhaled. 

Regulatory non-compliance

Textile chemicals face oversight under several major frameworks: 

• European Union: REACH Annex XVII restricts or bans many hazardous substances, including carcinogens. 

• United States: California Proposition 65 requires warning labels for products containing listed carcinogens above certain levels. 

• Global adoption: Many jurisdictions — including the United Kingdom, China, Japan, South Korea, and several U.S. states — have implemented RoHS-style or textile-specific chemical safety frameworks. Voluntary certifications such as OEKO-TEX® Standard 100 and ZDHC MRSL impose additional limits to eliminate hazardous substances at the manufacturing stage. 

This broad mix of mandatory and voluntary schemes means that a chemical banned in one market may still appear in imported goods from regions with less stringent oversight. 

Cross-border compliance complexity

Textile supply chains often span multiple countries, with fibers, dyes, coatings, and finishes sourced from different suppliers. A lack of full chemical transparency makes it difficult for brands to know exactly which substances are used in upstream processes. Ensuring compliance across global suppliers requires continuous monitoring, testing, and documentation. 

Reputational and consumer trust risk

Consumers and NGOs are increasingly vocal about chemical safety and ethical sourcing. High-profile reports of hazardous substances in clothing can spread rapidly on social media and harm brand reputation — even when products technically meet legal limits. Transparency, proactive communication, and third-party certifications are therefore essential to maintaining trust. 

 These challenges reflect broader trends shaping textile compliance globally, as explored in our overview of navigating global textile regulations and compliance. 

How are carcinogenic chemicals classified and tracked?

Carcinogens are classified based on the strength of scientific evidence linking them to cancer in humans. 

• IARC (International Agency for Research on Cancer): assigns substances to four groups — Group 1 (carcinogenic to humans), Group 2A (probably carcinogenic), Group 2B (possibly carcinogenic), and Group 3 (not classifiable). 

• GHS / the CLP (Classification, Labelling and Packaging Regulation): includes carcinogenicity as a hazard class, requiring substances in Categories 1A, 1B, or 2 to be labeled and handled accordingly. 

• EU REACH Regulation: substances identified as carcinogenic, mutagenic, or reprotoxic (CMR) may be added to the Candidate List of Substances of Very High Concern (SVHCs) and restricted under Annex XVII. 

These classifications are reflected in hazard communications such as Safety Data Sheets (SDSs) and product labels. Products containing carcinogenic chemicals may be subject to mandatory labeling with hazard statements (e.g., H350: May cause cancer), workplace controls, exposure limits, or regulatory restrictions. Together, these frameworks form the foundation for how regulators identify, label, and control carcinogenic chemicals globally. 

How businesses can avoid carcinogens in textiles

Avoiding carcinogenic chemicals in textiles starts with robust screening and full supply chain transparency. Companies must take a proactive, lifecycle-wide approach that addresses both products and processes. 

Key steps to avoid carcinogens in textiles include: 

• Map chemical use across the production lifecycle, from fiber creation and pre-treatment to dyeing, printing, coating, and finishing. 
• Screen inputs against Restricted Substance Lists (RSLs) and Manufacturing Restricted Substance Lists (MRSLs) to ensure hazards are eliminated at the source. 

• Use validated hazard data and digital tools (e.g., bluesign®, ChemSec SIN List, and other databases) to identify potential carcinogens before they enter production. 

• Engage suppliers for full chemical transparency, requiring disclosure, providing training, and conducting audits to strengthen compliance. 

For companies looking to go beyond substance screening and build long-term chemical transparency, our guide on uncovering hidden chemical hazards in textiles explores practical strategies to design safer products and processes.