OEKO-TEX Standard 100 is a product safety certification that tests textiles for over 100 harmful substances, including formaldehyde, heavy metals, pesticides, and flame retardants. If a product carries this label, it means an independent lab has verified that every component of the textile, from the fabric to the threads, buttons, and zippers, falls within strict safety limits for human contact. It’s one of the most widely recognized textile certifications in the world.
What the Certification Actually Tests For
The core purpose of Standard 100 is answering one question: is this textile safe to wear or use? To get there, labs test for a long list of chemicals that can end up in fabrics during manufacturing. These include formaldehyde (used to make fabrics wrinkle-resistant), azo dyes (which can release cancer-linked compounds), pesticide residues, heavy metals like lead and cadmium, phthalates, volatile organic compounds, and allergenic dyes.
The limits are specific and strict. For baby products, formaldehyde can’t exceed 16 parts per million. For clothing worn against the skin, the limit is 75 ppm. For items like curtains that don’t touch skin directly, it’s 300 ppm. Heavy metals follow a similar pattern: lead in baby textiles is capped at 0.2 mg/kg, mercury at 0.02 mg/kg, and arsenic at 0.2 mg/kg. Adult products allow slightly higher levels, but the caps are still well below thresholds considered harmful.
Pesticides and biocides are not permitted in finished products at all. Individual substances are flagged at just 1.0 mg/kg, and certain toxic compounds like organotin chemicals and polychlorinated biphenyls (PCBs) trigger detection at 0.05 mg/kg. The standard also covers every substance on the European Chemical Agency’s list of substances of very high concern, which is updated regularly.
PFAS Restrictions Since 2024
As of January 1, 2024, OEKO-TEX introduced a ban on the intentional use of PFAS, the group of synthetic chemicals often called “forever chemicals” because they don’t break down in the environment. The standard now tests for total fluorine with a limit of 100 mg/kg. This replaced an older, narrower testing method and brought the certification in line with U.S. regulations on PFAS. Additional substances of very high concern were also added to the restricted list, including compounds like 1,4-dioxane, a solvent linked to serious health effects.
Four Product Classes With Different Limits
Not all textiles carry the same risk. A onesie that a baby chews on is different from a jacket lining you never touch directly. Standard 100 accounts for this with four product classes, each with its own set of limit values:
- Product Class I: Items for babies and children under 3, such as diapers, bibs, and sleepwear. This class has the strictest limits across every tested substance.
- Product Class II: Items with direct skin contact, like bed linens, underwear, and t-shirts.
- Product Class III: Items without direct skin contact, such as jackets and coats where a lining sits between fabric and skin.
- Product Class IV: Home textiles and decorative materials, including curtains, tablecloths, and upholstery fabric.
The product class is printed on the label, so you can see at a glance which level of testing a product passed. A Class I certification on a baby blanket tells you it met the tightest chemical safety thresholds available under this system.
How Products Get Certified
Manufacturers submit product samples to one of OEKO-TEX’s authorized testing laboratories. The labs don’t just test the main fabric. Every component of the finished product is evaluated separately: zippers, buttons, linings, elastic, printing, and thread all need to pass. The certification can also cover complex finished goods like mattresses, strollers, and furniture.
Certificates are valid for one year. Annual renewal requires fresh testing to confirm the product still meets current standards, which matters because OEKO-TEX updates its restricted substance list regularly. In the first year of certification and every third year after that, an on-site audit of the manufacturing facility is also required. Renewal applications can be submitted up to three months before a certificate expires.
How to Verify a Label Is Legitimate
Every certified product carries a unique certificate number on its OEKO-TEX label. You can check whether that number is still valid by visiting the Label Check tool on the OEKO-TEX website (oeko-tex.com/en/label-check). Enter the certificate number, press “check,” and the tool will tell you whether the certificate is valid, expired, or withdrawn. This takes about 10 seconds and is the most reliable way to confirm you’re looking at a genuinely certified product rather than a knockoff label.
Standard 100 vs. GOTS Certification
These two labels show up on many of the same products, but they measure very different things. Standard 100 is a safety certification: it tests whether the finished product contains harmful chemicals, regardless of what fiber it’s made from. Cotton, polyester, nylon, hemp, blends of any kind can all qualify. It doesn’t evaluate how the fabric was grown, how the factory treats workers, or what happened to the wastewater.
GOTS (Global Organic Textile Standard) is broader. It requires at least 70% certified organic fibers and audits the entire supply chain from farm to finished garment, including wastewater treatment, emissions, packaging, and labor conditions. GOTS also restricts harmful chemicals, but its primary identity is as an organic and ethical production standard.
The simplest way to think about it: Standard 100 tells you the product is safe to use. GOTS tells you the product is safe, organic, and ethically made. Neither replaces the other, and some products carry both labels. If your main concern is whether a fabric will expose you or your child to harmful chemicals, Standard 100 directly answers that question. If you also care about environmental impact and labor practices, GOTS covers more ground.
What Standard 100 Does Not Cover
This certification is specifically about chemical safety in the finished product. It does not certify that a textile is organic, sustainably produced, or made under fair labor conditions. It doesn’t evaluate the environmental footprint of manufacturing, and it doesn’t guarantee durability or quality. A polyester shirt treated with dozens of chemicals during production can still earn Standard 100 certification, as long as the levels of those chemicals in the final product fall within the allowed limits. The standard is focused on what ends up touching your skin, not on what happened during production.