Testing clothes for toxic chemicals means examining garments for dangerous substances like formaldehyde, azo dyes, Per- and Polyfluoroalkyl Substances (PFAS), phthalates, and heavy metals that manufacturers apply during production. These chemicals get used for wrinkle resistance, color, water repellency, and softness, but many of them cause skin irritation, respiratory issues, and long-term health problems.
Checking clothes for harmful chemicals helps you reduce daily exposure, make safer purchasing decisions, and protect children and people with sensitive skin. The process covers 5 main approaches: reading clothing labels, looking for textile certifications, running simple at-home checks, understanding which chemicals to watch for, and sending samples to a professional laboratory when needed.
This guide walks through each method in plain terms, explains which clothing types carry the highest chemical risk, and covers what professional textile chemical testing actually involves.
What Harmful Chemicals in Clothing Are
Harmful chemicals in clothing are substances applied during textile manufacturing that remain in the finished garment and can transfer to human skin. These include processing aids like sizing agents and finishing treatments, dyes used for color, and performance-enhancing coatings for water or stain resistance.
Many of these substances do not appear on labels, which makes them difficult to identify without deliberate checking.
Why Chemical Safety in Textiles Matters
Your skin absorbs substances that contact it directly. When you wear treated clothing for extended hours each day, chemicals in the fabric transfer to your skin and enter your body over time.
Research on retail garments has found detectable levels of formaldehyde, heavy metals, and phthalates across price ranges, from low-cost fast fashion to premium brands. Regulatory standards vary significantly by country. The European Union follows EU REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals), which restricts over 200 substances in textiles. Many other countries have far weaker requirements, and manufacturers are generally not required to disclose chemical treatments on labels.
Health effects linked to chemical exposure from clothing include skin irritation, respiratory issues, contact dermatitis, endocrine disruption, thyroid function disruption, immune dysfunction, and in some cases increased cancer risk with prolonged exposure.
Common Signs Your Clothes May Contain Harmful Chemicals
There are 5 common signs that clothing may contain harmful chemical residues.
A sharp or chemical smell when you open the packaging or hold the garment near your face is the first warning sign. Skin redness, itching, or a rash that appears shortly after wearing a new item is another clear indicator.
Color that bleeds heavily into water during a quick soak test suggests poorly fixed dyes. A slippery, coated feel on synthetic fabrics with water-resistant claims points toward PFAS treatments. Label phrases like “wrinkle-free,” “stain-resistant,” or “easy care” without any certification mark round out the key warning signals.
None of these signs alone confirms a chemical hazard, but each one gives you reason to investigate further before wearing the item.
Check the Clothing Label First
The clothing label is the first source of information available before any test. Start here and read every detail, not just the size.
Fabric Composition
The fiber content label tells you what the garment is made of. Synthetic fibers including polyester, nylon, and acrylic tend to carry more chemical residues from manufacturing than natural fibers. This happens because synthetic production involves more chemical processing steps and requires stronger finishing treatments to achieve desired properties.
100% natural fibers like organic cotton or linen generally carry fewer residual chemicals, though non-organic versions can still involve pesticide and finishing chemical use. Blended fabrics combine risk levels depending on their composition.
Country of Origin
The country of manufacture gives you context about the regulatory environment where the garment was produced. Countries with stricter chemical regulations, particularly within the European Union, enforce tighter limits on restricted substances.
Garments produced in regions with minimal textile safety enforcement may carry higher chemical loads, especially at the low-cost end of the market. Country of origin does not guarantee safety or danger on its own, but it helps you assess the likelihood of compliance with restricted substance standards.
Care Instructions and Chemical Finishes
Care labels sometimes reveal chemical treatments indirectly. Instructions that warn against hot water washing or suggest dry cleaning only can indicate the presence of finishes that break down under heat or water.
Garments that require dry cleaning frequently contain volatile organic compounds (VOCs) and residual chlorinated solvents from the cleaning process itself.
Claims Such as Wrinkle-Free, Stain-Resistant or Water-Repellent
These performance claims are the most direct indicators of chemical treatment. Here is what each one typically signals.
“Wrinkle-free” and “permanent press” almost always indicate a formaldehyde-based resin treatment applied to hold the fabric’s shape. “Easy care” and “no-iron” are alternative names for the same treatment.
“Stain-resistant” and “water-repellent” labels typically indicate PFAS or fluorocarbon coatings that repel water and oil. “Antimicrobial” and “odor-resistant” labels indicate biocidal treatments, which commonly use triclosan or silver nanoparticles. Both raise concerns about antibiotic resistance and thyroid function disruption.
Look for Trusted Textile Certifications
Third-party textile certifications are the most reliable way to verify chemical safety without sending the garment to a laboratory. Look for certification marks on the label, product packaging, or the brand’s website.
OEKO-TEX STANDARD 100
OEKO-TEX Standard 100 tests finished textile products for over 350 regulated and non-regulated substances. It operates across 4 product classes based on intended use. Class I applies the strictest limits for baby and infant items, and Class II covers garments with direct skin contact.
You can verify any OEKO-TEX Standard 100 certificate through the OEKO-TEX website using the label number printed on the certified product.
GOTS
Global Organic Textile Standard (GOTS) certifies the entire textile supply chain from organic raw fiber through to the finished product. GOTS bans all toxic processing inputs, requires wastewater treatment at production facilities, and mandates social criteria throughout the chain.
GOTS certification covers both organic fiber sourcing and chemical safety in processing, making it one of the most comprehensive standards available.
bluesign
bluesign certification focuses on responsible chemical management throughout the manufacturing process rather than the finished product alone. It screens over 6,000 chemical substances and works particularly well for outdoor and performance clothing brands where water repellency and dye fastness treatments are common.
ZDHC
Zero Discharge of Hazardous Chemicals (ZDHC) is a programme that requires participating brands and their suppliers to eliminate hazardous chemicals from wastewater discharge. ZDHC maintains a Manufacturing Restricted Substances List (MRSL) that covers chemicals used in production.
It operates primarily at the supply chain level rather than as a consumer-facing product label, but brands that follow ZDHC standards produce textiles with lower residual chemical loads.
How to Verify a Certificate Number
Each certification body maintains a public database. For OEKO-TEX Standard 100, visit the OEKO-TEX website and enter the label number shown on the product. For GOTS, search the GOTS public database by company name or certificate number. For bluesign, check the bluesign system partner list.
Verification takes under two minutes and confirms whether a certificate is current and applies to the specific product class shown.
Use Simple At-Home Checks Before Wearing New Clothes
You can run 5 simple checks at home before wearing new garments, without any specialist equipment.
The Smell Test
Hold the garment close to your face and take a deliberate sniff, particularly near the seams, prints, and inner lining where chemicals concentrate.
A sharp, pungent chemical smell indicates likely formaldehyde or finishing agents. A musty or sweet smell suggests fungicide treatments used during storage or humid-condition shipping. A “new plastic” smell from synthetic fabrics indicates VOCs off-gassing from polyester, nylon, or acrylic production.
Keep in mind that no smell does not guarantee the garment is chemical-free. Some substances are odourless at detectable concentrations.
The Rub Test
Rub a damp white cloth firmly against the fabric for 30 seconds, then check the cloth for color transfer. Significant dye transfer indicates excess dye that has not been properly fixed during production.
Unfixed dyes can indicate the presence of azo dyes, some of which release carcinogenic aromatic amines under skin contact and sweat exposure. This test works best on dark, bright, or printed fabrics.
The Water Repellency Test
Drop a few drops of water on the fabric surface and observe what happens. Water that beads up and rolls off immediately indicates a water-repellent treatment, likely PFAS or a fluorocarbon coating.
Water that soaks into the fabric within a few seconds suggests no repellency coating is present. This test helps you identify garments most likely to contain PFAS before further investigation.
The Colour Bleeding Test
Fill a basin with warm water and soak the garment for 20 to 30 minutes. Water that changes color significantly indicates excess dye. Cheap dyes that bleed out easily may use heavy metals like chromium, cobalt, or lead as fixatives.
Foam or a film on the water surface suggests residual sizing agents, softeners, or finishing treatments dissolving out of the fabric. Clear water after soaking is a positive sign, though it does not rule out water-insoluble chemicals.
The Skin Sensitivity Check
Wear the unwashed garment for 30 minutes against a patch of skin on your inner wrist or forearm, then check for redness, itching, or irritation. Any reaction signals that you should wash the garment multiple times before wearing it again, or avoid it entirely for people with sensitive skin.
This check is particularly important before infant skin contact.
Chemicals Commonly Found in Clothing
There are 8 major categories of harmful chemicals found in clothing.
Formaldehyde
Formaldehyde is a known carcinogen applied to textiles as a resin treatment to prevent wrinkles, shrinkage, and creasing. It bonds to fabric fibres and releases slowly over time, particularly with heat and sweat.
Garments marketed as wrinkle-free, permanent press, easy care, or no-iron almost always contain formaldehyde-based resin treatment. Symptoms from exposure include skin irritation, eye irritation, respiratory issues, and headaches with prolonged contact.
Azo Dyes
Azo dyes are synthetic colorants used in approximately 60 to 70 percent of commercial textile dyeing worldwide. Some azo dyes break down under skin contact, heat, and sweat to release carcinogenic aromatic amines, which the skin absorbs.
The European Union bans certain azo dyes above strict concentration limits. They appear most commonly in dark, bright, and heavily printed fabrics.
PFAS Forever Chemicals
PFAS are applied to textiles to create water-repellent, stain-resistant, and oil-resistant surfaces. PFAS do not break down in the body or the environment, which explains why they carry the name “forever chemicals.”
Research links PFAS exposure to cancer, thyroid disease, immune dysfunction, and reproductive harm. They are present in waterproof jackets, stain-resistant trousers, outdoor gear, and many types of sportswear.
Phthalates
Phthalates appear in plastisol prints, the rubbery or raised designs on t-shirts and sportswear, and in flexible PVC (polyvinyl chloride) components. They function as plasticisers that keep materials soft and flexible.
Phthalates are endocrine disruptors linked to reproductive and developmental harm. They do not appear on clothing labels, which makes them difficult for consumers to detect without testing.
Heavy Metals
Heavy metals including lead, chromium, cadmium, and cobalt serve as dye fixatives and pigments in textile production. Chromium is used in the tanning of leather. Lead and cadmium appear in dyes and decorative components.
These metals accumulate in the body over time and cause neurological harm, kidney damage, and developmental problems. Dark-colored and heavily printed garments carry the highest heavy metal risk.
Flame Retardants
Flame retardants are applied to children’s sleepwear, upholstered textiles, and some workwear to meet fire safety standards. Several common flame retardants are persistent organic pollutants that accumulate in body tissue.
Some are linked to cancer, hormone disruption, and neurological effects. The use of flame retardants in children’s clothing makes this category particularly important to check.
Chlorinated Solvents
Chlorinated solvents appear as residual processing chemicals from dry cleaning and some textile manufacturing steps. These volatile organic compounds off-gas from fabric and cause respiratory irritation and headaches.
Garments that require dry cleaning carry elevated risk of chlorinated solvent residue compared to water-washable items.
Antimicrobial Treatments
Antimicrobial treatments use biocidal substances including triclosan and silver nanoparticles to prevent odour-causing bacteria from growing in the fabric. Triclosan is banned from hand soaps in several countries due to its link to antibiotic resistance and thyroid function disruption, but it remains in active use in textiles.
Silver nanoparticles release into wastewater during washing and raise environmental and health concerns at scale.
Clothing Types Most Likely to Contain Harmful Chemicals
Some garment categories carry significantly higher chemical risk than others based on their production methods and performance claims.
Fast Fashion Garments
Fast fashion garments prioritise low production cost and rapid turnover over chemical safety. These items frequently use cheaper dyes with poor fastness, minimal finishing quality control, and processing chemicals at the highest permissible concentrations.
Studies testing fast fashion garments from major low-cost retailers have found elevated formaldehyde, azo dye, and heavy metal levels compared to products from regulated markets.
Children’s Clothing
Children’s clothing carries elevated concern for two reasons. First, children’s skin is more permeable than adult skin, which means chemical absorption rates are higher per unit of skin surface. Second, flame retardant requirements for children’s sleepwear mean that treated items carry potential exposure to persistent chemicals.
Wash children’s clothing 2 to 3 times before first use and look for GOTS or OEKO-TEX Standard 100 Class I certification for infant items before infant skin contact.
Sportswear and Activewear
Sportswear and activewear combine multiple chemical treatment categories in a single garment. PFAS provide moisture management and water resistance. Antimicrobial treatments prevent odour. Elastane and synthetic blends use chemical softeners and finishes.
Dye intensity in colorful activewear increases the likelihood of azo dye use. People who wear sportswear for extended periods during exercise and sweating face higher chemical absorption rates than with everyday clothing.
Waterproof and Stain-Resistant Clothing
Waterproof and stain-resistant clothing almost universally relies on PFAS or fluorocarbon coatings to achieve its performance claims. Outdoor jackets, rain gear, stain-resistant trousers, and school uniforms with easy-care finishes fall into this category.
The water repellency test at home lets you identify these items quickly. During outdoor gear purchase, check specifically for PFAS-free alternatives, which several outdoor brands now produce using non-fluorinated water repellent treatments.
Dark, Bright and Printed Fabrics
Dark, bright, and heavily printed fabrics require large quantities of reactive dyes and fixatives to achieve and hold their color. Heavy metal fixatives including chromium and cobalt stabilise dye molecules in the fabric. Azo dye use is highest in this category.
Plastisol prints on t-shirts introduce phthalate leaching risk. The rub test and color bleeding test are most useful on these fabric types.
Leather and Synthetic Leather Products
Genuine leather undergoes chromium tanning in the majority of commercial production, which leaves chromium residues in the finished material. Chromium (VI), the oxidised form, is a known carcinogen.
Synthetic leather made from PVC contains phthalate plasticisers that can leach from the material under heat and skin contact. Both material types warrant extra attention for people who wear leather accessories, belts, shoes, or jackets directly against skin.
How Professional Textile Chemical Testing Works
Professional textile chemical testing uses laboratory methods to identify and quantify specific substances in fabric samples. There are 7 main types of testing used in textile safety analysis.
Restricted Substance List Testing
Restricted Substance List (RSL) testing screens a garment against a defined list of prohibited or limited chemical substances. Major brands maintain their own RSLs based on regulatory requirements from markets including EU REACH and US CPSC.
RSL testing panels cover dozens to hundreds of substances in a single submission and form the basis of most commercial textile quality assurance programmes.
Heavy Metal Testing
Heavy metal testing uses techniques including atomic absorption spectrometry (AAS) and inductively coupled plasma mass spectrometry (ICP-MS) to measure concentrations of lead, cadmium, chromium, cobalt, arsenic, and other metals in fabric and accessories.
Results are reported in parts per million (ppm) and compared against regulatory thresholds, including EU REACH limits and CPSC requirements for children’s products.
Formaldehyde Testing
Formaldehyde testing in textiles follows standard methods including the Water Extraction Method and the Steam Distillation Method, standardised under ISO 14184. Results are measured in milligrams per kilogram (mg/kg) of fabric.
OEKO-TEX Standard 100 sets limits of 20 mg/kg for baby products, 75 mg/kg for direct skin contact items, and 300 mg/kg for non-skin-contact textiles.
Azo Dye Testing
Azo dye testing uses solvent extraction followed by gas chromatography-mass spectrometry (GC-MS) to identify whether azo dyes decompose into any of the 24 carcinogenic aromatic amines listed under EU REACH.
Testing follows ISO 17234 for leather and ISO 14362 for textiles. Detection limits fall in the range of 5 to 10 mg/kg per amine.
pH Testing
pH testing measures whether fabric finishes have left the textile in an acidic or alkaline state. Healthy skin sits at pH 4.5 to 5.5. Textiles with pH values outside the range of 4.0 to 7.5 can irritate skin or disrupt its natural barrier.
OEKO-TEX Standard 100 requires pH values within 4.0 to 7.5 for direct skin contact garments. Via at-home pH strips, you can carry out a rough version of this test by soaking a fabric sample in distilled water and testing the water’s pH.
Colour Fastness Testing
Colour fastness testing measures how well dyes hold to the fabric under wet rubbing, dry rubbing, perspiration, and washing conditions. Poor colour fastness means dyes transfer more easily to skin, increasing chemical exposure.
Testing follows ISO 105 standards and rates fastness on a scale of 1 (poor) to 5 (excellent). Ratings below 3 indicate significant dye transfer risk in everyday use.
PFAS Screening
PFAS screening uses liquid chromatography-mass spectrometry (LC-MS/MS) to detect and quantify individual PFAS compounds in textile samples. Total fluorine screening via combustion ion chromatography provides a faster initial scan across all fluorinated compounds.
Full PFAS testing panels identify individual compounds against regulatory limits, including restrictions under EU REACH and state-level regulations in the United States.
When You Should Send Clothing for Laboratory Testing
Send clothing for laboratory testing in 6 specific situations.
When a garment will be worn by infants or newborns and carries no recognised certification, professional testing rules out hazards that at-home checks cannot detect. When a child or adult experiences repeated skin reactions to a specific garment despite washing, RSL testing identifies the causative chemical.
When your business imports, manufactures, or sells clothing and needs to verify compliance with EU REACH, CPSC, or other market regulations, laboratory testing provides documented proof. When you purchase vintage synthetic fabrics or secondhand fast fashion in bulk for resale, heavy metal testing and formaldehyde testing confirm safety before distribution.
When a brand makes specific chemical safety claims without certification documentation, independent laboratory testing verifies or disputes those claims. When regulatory authorities require compliance documentation for product import or retail in a specific market, accredited laboratory results meet the evidentiary standard.
How to Reduce Chemical Exposure from New Clothes
There are 5 practical steps to reduce your chemical exposure from new clothing.
Wash Before Wearing
Wash every new garment before wearing it for the first time. A single wash removes 60 to 80 percent of surface chemical residues including formaldehyde, sizing agents, and softeners. A second wash removes most of what remains.
Use warm to hot water where the care label allows, as higher temperatures dissolve chemical residues more effectively than cold water. For children’s clothing, wash 2 to 3 times with fragrance-free detergent before first use.
Choose Certified Fabrics
Buy clothing that carries OEKO-TEX Standard 100, GOTS, or bluesign certification. These labels confirm that an independent body has tested the product against defined chemical limits. For organic cotton garments, GOTS certification confirms the entire supply chain from fibre to finish meets chemical safety criteria.
Avoid Strong Chemical Odours
Avoid buying garments with a strong chemical smell. The smell test at the point of purchase takes under 10 seconds and identifies the most heavily treated items. A sharp or solvent-like odour near seams or prints indicates high residual chemical concentrations that may not wash out fully.
Buy From Transparent Brands
Buy from brands that publish their chemical management policies, supplier lists, and test results. Brands that participate in the Greenpeace Detox Campaign, follow ZDHC standards, or publish annual chemical safety reports show a genuine commitment to reducing hazardous substances across their supply chain.
Be Careful With Cheap Imported Clothing
Approach cheap imported clothing with extra caution, especially items sold through online marketplaces with limited regulatory oversight. Budget fast fashion items from markets with weak textile safety enforcement carry the highest statistical likelihood of exceeding chemical safety thresholds.
Apply at-home checks before wearing, wash multiple times, and consider certification requirements before regular use.
Safe Clothing Checklist for Consumers and Brands
For consumers:
- Check the label for performance claim phrases before buying
- Run the smell test, rub test, and water repellency test on new items
- Look for OEKO-TEX Standard 100, GOTS, or bluesign certification marks
- Wash all new clothing at least once before wearing
- Wash children’s items 2 to 3 times before first use
- Avoid garments with persistent chemical smells
- Soak dark or printed fabrics in water to check for color bleeding
For brands and manufacturers:
- Maintain and enforce a published Restricted Substances List aligned with EU REACH and ZDHC MRSL
- Require third-party RSL testing documentation from all tier-one suppliers
- Pursue GOTS, OEKO-TEX Standard 100, or bluesign certification for key product lines
- Phase out PFAS treatments in favour of non-fluorinated water repellent alternatives
- Publish chemical management policies and testing results transparently
- Conduct formaldehyde testing across all easy-care and performance fabric lines
Clothing Chemical Testing Services at SAB Labs
SAB Labs provides accredited textile chemical testing services for brands, importers, and retailers who need documented chemical compliance for their garments. Testing services cover Restricted Substance List testing, formaldehyde testing, azo dye analysis, PFAS screening, heavy metal testing, pH testing, and colour fastness testing in line with EU REACH, OEKO-TEX Standard 100, and international ISO methods.
Brands that need test reports to support market access, certification applications, or consumer transparency programmes can submit fabric samples and receive detailed analytical reports with results compared against applicable regulatory thresholds. Contact SAB Labs for information on sample submission requirements, turnaround times, and testing packages relevant to your product category.
Frequently Asked Questions About Harmful Chemicals in Clothes
Can washing remove harmful chemicals from clothes?
Yes, washing removes a significant portion of surface chemical residues. A single wash eliminates roughly 60 to 80 percent of surface-level chemicals. A second wash removes most of what remains. It does not remove chemicals bonded into the fabric structure, such as formaldehyde resin in wrinkle-free garments.
Are new clothes safe to wear without washing?
No. New clothes carry chemical residues from manufacturing and finishing that transfer to skin on first wear. Washing before wearing is the single most effective step to reduce that exposure.
Which clothing materials are safest for sensitive skin?
GOTS-certified organic cotton is the safest option for sensitive skin. Linen and hemp are also low-chemical choices. Avoid synthetic blends with performance claims like wrinkle resistance or moisture management for sensitive skin contact.
How do I know if clothes are formaldehyde-free?
Check for an OEKO-TEX Standard 100 certification, which requires formaldehyde testing with defined limits. Also check whether the label uses phrases like “wrinkle-free,” “permanent press,” “easy care,” or “no-iron,” as all of these indicate formaldehyde-based resin treatment. Professional formaldehyde testing following ISO 14184 gives a definitive result for specific garments.
Can textile testing detect all harmful chemicals?
No. Testing detects only the chemicals included in the test panel. New chemicals enter textile production regularly and may not yet appear on standard panels. No single test confirms a garment is entirely chemical-free.
What certification should I look for when buying safer clothing?
Look for OEKO-TEX Standard 100 for finished garments with verified chemical limits across 350-plus substances. Choose GOTS if organic fibre sourcing and full supply chain chemical control matter to you. For outdoor and performance clothing, look for bluesign certification.
