What Is Oeko-Tex Standard 100?

Oeko-Tex Standard 100, established in 1992 and now recognised in more than 100 countries, is an independent textile certification system. It tests for more than 100 harmful chemical substances — including pesticide residues, heavy metals, formaldehyde, pH value, colour fastness and allergenic dyes. Each product is assigned to one of four classes based on its intended use and skin-contact intensity.

The Four Product Classes

Class Description Example Products
Class IFor babies and small children (0–3 years)Baby blankets, baby piques
Class IIProducts in contact with the skinHousehold blankets, piques, sheets
Class IIIProducts not in contact with the skinUpholstery fabric, curtains
Class IVDecoration and accessory productsTablecloths, gift textiles

Sesli Tekstil blanket and pique products are certified under Class I and Class II.

Main Substances Tested

The harmful substances tested under Oeko-Tex Standard 100 include:

  • Pesticide residues: Particularly important in cotton and other natural-fibre products.
  • Heavy metals: Elements such as lead, cadmium, arsenic and chromium.
  • Formaldehyde: Used as a crease-resistance finish and dye auxiliary; Oeko-Tex does not allow residues above its limits.
  • pH value: Must fall within the skin-friendly range of 4.0–7.5.
  • Allergenic and azo dyes: Azo dye classes that can form carcinogenic amines are prohibited.
  • Colour fastness: Must meet minimum thresholds for perspiration, rubbing and light fastness.
Important: Oeko-Tex Standard 100 testing is performed only on the finished product. Raw-material or yarn-level certifications are evaluated separately. For this reason, Sesli Tekstil includes both its raw material suppliers and its finished products in the certification process.

Oeko-Tex in Practice at Sesli Tekstil

Blanket Collection

Sesli Tekstil blankets — in polyester, acrylic and cotton-blend options — are tested under Oeko-Tex Standard 100 Class II. GRS-certified blankets made from rPET (recycled PET bottle) yarn also pass the same chemical-safety test. Buyers thus receive both sustainability (GRS) and chemical safety (Oeko-Tex) assurance in a single product.

Pique Collection

Pique products are evaluated under Class II due to their intensive skin contact. The white solid piques typically in demand for hotel and dormitory procurement are a priority within our Oeko-Tex certification scope.

How to Verify an Oeko-Tex Certified Product

Each Oeko-Tex certificate carries a certificate number that can be queried in the publicly available database. Verification steps:

  • 1. Go to oeko-tex.com and open the "Check Certificate" section.
  • 2. Enter the certificate number you have requested from Sesli Tekstil.
  • 3. Verify the certificate's validity date, product scope and certificate holder.

Sesli Tekstil shares its certificate numbers and current Oeko-Tex documents with buyers on request.

Certifications Complementing Oeko-Tex

Sesli Tekstil products are manufactured under multiple certifications, each providing a different layer of assurance:

  • Oeko-Tex Standard 100: Chemical safety (human health)
  • GRS: Traceability of recycled content — read our GRS article
  • ISO 9001: Quality management system in production processes
  • BSCI / Amfori: Social compliance and workplace conditions

You can find all our certification documents on our Certifications page.

Frequently Asked Questions

What is Oeko-Tex Standard 100?
Oeko-Tex Standard 100 is an international standard that tests and certifies textile products in independent laboratories for more than 100 chemical substances potentially harmful to human health. It covers four product classes — from baby products to industrial textiles.
How is an Oeko-Tex certified product verified?
Verification is done by entering the certificate number in the "Check Certificate" section at oeko-tex.com. Each certificate has a validity period and must be renewed annually. We share Sesli Tekstil's current certificate numbers on request.
Which Sesli Tekstil products are Oeko-Tex certified?
Sesli Tekstil blanket and pique products are certified under Oeko-Tex Standard 100 in Class I and Class II. For current scope information please contact info@sesli.com.tr.
Can Oeko-Tex and GRS certifications be used together?
Yes. Oeko-Tex verifies chemical safety, GRS verifies the traceability of recycled content. Sesli Tekstil can provide both on selected kilim products that use GRS-documented yarn.