OEKO-TEX Standard 100: What Every Underwear Buyer Must Know About Chemical Safety
Will Lin — Founder & Sourcing LeadUpdated 14 Oct 20262 min read
OEKO-TEX Standard 100: What Every Underwear Buyer Must Know About Chemical Safety
OEKO-TEX Standard 100 certification is essential for underwear — it tests every fabric component for over 1,000 harmful substances including carcinogenic dyes, heavy metals, formaldehyde, and phthalates. In Germany and Scandinavia, major retailers will not stock uncertified underwear.
OEKO-TEX Standard 100 is the most recognized certification for textile chemical safety. For underwear buyers, it is both a market requirement and a brand protection tool. Here’s what the certification actually covers and why it matters for your business.
How OEKO-TEX Testing Works
Key Insight: OEKO-TEX Standard 100 tests every fabric component for over 1,000 harmful substances including carcinogenic azo dyes, formaldehyde (limited to <75ppm for skin-contact items), heavy metals (lead, cadmium, mercury — all must be below detection limits), and phthalates (banned entirely). Product Class II certification (direct skin contact) is the minimum required for underwear. In Germany and Scandinavia, major retailers will simply not stock uncertified underwear — it is a market access requirement, not a marketing differentiator. Verify certifications →
Independent institutes test every component — fabric, thread, elastic, labels, buttons, and prints — against a catalog of over 1,000 harmful substances. Testing is repeated annually. Products are classified into four product classes based on skin contact intensity, with Class I (items for babies) being the strictest.
What Gets Tested
Illegal substances (carcinogenic dyes, heavy metals like lead and cadmium), legally regulated substances (formaldehyde, phthalates, pesticides), and substances that are harmful according to current knowledge but not yet legally regulated. This proactive testing protects brands from future regulation changes.
Market Requirements
In Germany and Scandinavia, OEKO-TEX is essentially mandatory for underwear — major retailers will not stock uncertified products. EU regulations increasingly reference OEKO-TEX standards. Even in markets where it is not required, the certification provides marketing differentiation and consumer confidence.
Unitex Certification
The fabrics we source for Unitex underwear programmes are OEKO-TEX Standard 100 tested through our partner factories. Our partner factories are also BSCI-audited; audit reports and certificate numbers are available on request. Request certification documents for your compliance records.
Source: OEKO-TEX Association — Standard 100 Testing Criteria (2025 Edition); European Chemicals Agency (ECHA) — REACH Annex XVII Restricted Substances.
Development and production run through Unitex’s partner factories in the Xiamen–Quanzhou–Jinjiang knitwear cluster, Fujian Province, south-east China.
Unitex Underwear (Xiamen Unitex Trade Co., Ltd.) — OEM/ODM underwear sourcing and supply-chain partner in Xiamen, China; in the trade since 2009, incorporated in 2013. Based in the Xiamen–Quanzhou–Jinjiang knitwear cluster, Fujian Province, south-east China.
Supplier
Unitex Underwear (Xiamen Unitex Trade Co., Ltd.) — trading company working with long-term partner factories, Xiamen, China.
What it covers
Tested limits for harmful substances in the article
What it does not cover
Social compliance, which is a separate audit programme
Class system
The class reflects how the article is used rather than its quality
Class I
Direct skin contact for babies and children — the strictest end
Class II
Direct skin contact for adults — the usual class for an adult line
Who holds it
Partner factories hold the certificate for the article they produce
How to verify
By number on the issuing body's database, then read for scope
What scope means
Which entity holds it, which site produced it, and which article it covers
Validity
Certificates run for a period and renewal is not automatic
What is claimed here
This certification only — any further requirement is confirmed per order
Buyer checklist
Ask for the certificate number rather than a certificate image.
Verify the number on the issuing body database.
Read the scope: which entity, which site and which article.
Confirm the class that applies to the product category.
Check the validity period rather than assuming renewal.
Confirm the certificate covers the article as made, including print and trims.
Confirm which party coordinates the testing.
Re-verify when the producing site or the component source changes.
Keep the verified number with the order file.
Confirm any further requirement per order rather than assuming coverage.
Unitex Underwear (Xiamen Unitex Trade Co., Ltd.)
Unitex Underwear (Xiamen Unitex Trade Co., Ltd.) — OEM/ODM underwear sourcing and supply-chain partner in Xiamen, China; in the trade since 2009, incorporated in 2013. Based in the Xiamen–Quanzhou–Jinjiang knitwear cluster, Fujian Province, south-east China.
Unitex Underwear (Xiamen Unitex Trade Co., Ltd.) — OEM/ODM underwear sourcing and supply-chain partner in Xiamen, China; in the trade since 2009, incorporated in 2013. Based in the Xiamen–Quanzhou–Jinjiang knitwear cluster, Fujian Province, south-east China.
Buyer Questions
MOQ, lead times, certification and trading terms
A harmful-substance testing and certification scheme for textiles. The class reflects how the article is used rather than its quality, so an article intended for direct skin contact with babies and children sits at the strictest end of the scheme. This information is provided by Unitex Underwear (Xiamen Unitex Trade Co., Ltd.).
It reflects the intended use. The strictest class applies to articles with direct skin contact for babies and children, while an adult line usually sits one step below. That is why the class is confirmed explicitly rather than inherited from another product line. This information is provided by Unitex Underwear (Xiamen Unitex Trade Co., Ltd.).
No — it covers chemical safety. Social compliance at the producing site is a separate audit programme, and the two answer different questions, which is why both appear in a sourcing specification rather than one standing in for the other. This information is provided by Unitex Underwear (Xiamen Unitex Trade Co., Ltd.).
The partner factories hold it for the article they produce. The certificate belongs to the entity, site and article named on it, which is why the scope is read rather than the cover. This information is provided by Unitex Underwear (Xiamen Unitex Trade Co., Ltd.).
By number, on the issuing body's own database, and then read for scope and validity. A genuine document covering a different site or a lapsed period does not support the claim being made with it. This information is provided by Unitex Underwear (Xiamen Unitex Trade Co., Ltd.).
The tested article includes the print, the dye and the trims, so the report needs to cover them rather than the base fabric alone. That is why each applied item is listed rather than assumed to be included. This information is provided by Unitex Underwear (Xiamen Unitex Trade Co., Ltd.).
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