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What Does OEKO-TEX® STANDARD 100 Mean and Why It Is Important When Buying a Silk Pillowcase or Silk Sheet

by Zoe Doyle | May 18, 2026 | 8 min read

OEKO-TEX® is a global certification system you can trust. A textile product with the OEKO-TEX® STANDARD 100 label has been independently tested for harmful substances according to strict scientific criteria (far beyond legal regulations). All Mulberry Park Silks products are certified OEKO-TEX® STANDARD 100. This article explains what this means and why it matters when purchasing silk sheets, pillowcases, and accessories.

Key Takeaways

  • OEKO-TEX® Certified for Safety: Mulberry Park Silks products are OEKO-TEX® STANDARD 100 certified, tested for over 1,000 harmful substances, and safe for daily use.

  • Silk’s Unique Benefits: Naturally gentle on hair and skin, silk reduces friction, prevents tangles, retains moisture, and minimizes wrinkles. It’s also hypoallergenic, breathable, and temperature-regulating for year-round comfort.

  • Strict Testing & Quality Assurance: Every component—from raw silk to finished bedding—is independently tested to meet rigorous OEKO-TEX® safety and quality standards.

  • OEKO-TEX® vs. GOTS: GOTS applies to organic plant-based fibers, not silk. OEKO-TEX® STANDARD 100 is the gold standard for certifying silk is free from harmful substances.

  • Why Certification Matters: Low-quality silk may contain pesticides, bleach, or toxic dyes. Choosing OEKO-TEX® certified silk ensures a cleaner, safer product.

What Does OEKO-TEX® STANDARD 100 Mean and Why It Is Important When Buying a Silk Pillowcase or Silk Sheet


Silk: A Fabric With Unique Properties and Benefits

Woman Modeling with A 19 Momme Silk Pillowcase in White

As a leading manufacturer of silk sheets, pillowcases, and accessories , Mulberry Park Silks is dedicated to educating our clients on the many benefits of silk. Luxuriously soft and naturally nourishing, silk promotes healthier hair, radiant skin, and overall wellness. It is temperature-regulating, hypoallergenic, and non-irritating-making it ideal for even the most sensitive skin. Additionally, silk is naturally resistant to mold and mites, ensuring a cleaner and more comfortable sleep environment.

Going a Step Further for Consumer Protection

Baby on Silk Crib Sheets

At Mulberry Park Silks, we go a step further to ensure our fabric's safety. Along with ensuring that our silk sheets and accessories meet the highest standards of beauty, comfort, and color fastness, all of our silk products are certified OEKO-TEX® STANDARD 100. This means that all of our products and their components have been tested against a list of over 1,000 harmful substances according to OEKO-TEX® STANDARD 100. We have taken this extra step to reassure customers that manufacturing non-toxic silk sheets is of the utmost importance to us. Every piece of silk you bring into your home from Mulberry Park Silks is safe and natural (gentle enough even for your baby), including our luxury children's silk bedding for babies and toddlers . We want to give you the peace of mind that your silk bedding has undergone rigorous testin

Oeko-Tex is an International Association offering several distinct labels, each targeting different layers of textile sustainability. OEKO-TEX® STANDARD 100 was developed by European textile institutes to help reduce the environmental footprint of the textile industry and promote sustainable supply chains. This global testing and accreditation program establishes strict standards for production processes and employs testing systems to screen for potentially harmful chemicals in the textile and leather industry. To earn certification, every component of a textile product, including threads, buttons, and accessories, must meet rigorous testing criteria. Brands seeking certification must submit relevant information and materials for evaluation at every stage, from raw fabric to the final product, for complete output control. OEKO-TEX maintains five distinct standards, with the most recognized being the Standard 100, which certifies that textiles have been tested against a long list of harmful substances. If any detected substance exceeds the established limit value, the product does not meet certification requirements.

How Mulberry Park Silks Products Earn the OEKO-TEX® STANDARD 100 Certification

Close-up of an OEKO-TEX STANDARD 100 silk textile label showing certification text in multiple languages on a white tag.

Mulberry Park Silks Certification #

OEKO-TEX® STANDARD 100 certification means that independent labs have analyzed the product against  test criteria for a variety of harmful substances , including formaldehyde, heavy metals, pesticides, phthalates, chlorinated phenols, colorants, solvents, and other chemicals; these are often used in producing fabric, including silk, organic cotton, and even other materials. OEKO-TEX® certifications encourage the efficient use of resources throughout textile production. Apart from it's impact on our health, the OEKO-TEX® STANDARD 100 indicates the ecological impact of production, emphasizing some key tenets of green certification, including efficient use of resources throughout textile production. follows a tiered independent testing approach: the more intimate a fabric's contact with the skin, the more stringent and comprehensive the testing. Testing limits for harmful substances are reviewed annually and adjusted as needed to ensure continued compliance with evolving safety standards. These updates help ensure compliance with major international regulations such as REACH and CPSIA while incorporating the newest scientific findings related to chemical safety and sustainable supply chains.

Product classes are categorized and tested according to their intended use :

  • Class I — Items for babies such as crib and bassinet sheets, swaddles and baby apparel (strictest limits)

  • Class II — Products that have direct contact with the skin such as pillowcases, sheets, bedding sets, and clothing

  • Class III — Products without direct contact with the skin such as stuffing, fabric lining, and decorative embellishments

  • Class IV — Home textiles such as wall coverings, curtains, upholstery fabric

To receive certification and bear the STANDARD100 product label, all components and materials of textile products must comply with the test criteria, many of which are significantly more stringent than government regulations require. Once these steps are completed, the designation, "OEKO-TEX® CONFIDENCE IN TEXTILES -- STANDARD 100 -- Tested for harmful substances" is officially issued.

Transparent Laboratory Testing Methods: How We Test for Harmful Substances Earning Consumer Trust by

OEKO-TEX Fabric Testing

The process for Mulberry Park Silks' pure silk fabric to be OEKO-TEX® STANDARD 100 certified is quite stringent and must be renewed on an annual basis. OEKO-TEX® is an internationally recognized standard for textile processing. First our production site submits an application to the OEKO-TEX® Institute for testing of textile products. Once accepted, a sufficient quantity of pure silk raw materials, as well as finished silk product samples such as silk sheets, must be provided to the lab. The lab then determines the testing specifics based on the intended use of the product, as noted above. A textile used for bedding, or by infants and children, would be tested differently than a table linen or decorative wall hanging.

Next, an independent OEKO-TEX® laboratory tests the silk according to strict protocols, documenting the process with details such as the test date, sample designation (including manufacturing batch, finishing batch, and color), the individual responsible for testing, and the results. To ensure ongoing quality, fabrics undergo random on site audits periodically. While this certification process is entirely voluntary, our commitment is twofold: to offer products with integrity that we trust for our own children and to minimize our carbon footprint, keeping sustainable development at the forefront of everything we do.

Although silk fiber is naturally hypoallergenic and generally non-irritating to even sensitive skin , it is important to be certain that the silk products you bring into your home are checked for contaminants. Low-quality silk may contain pesticides, fertilizer, bleach, groundwater waste, and other harmful toxins and chemicals. The restricted substance list is updated annually to reflect the newest scientific findings and legal restrictions, regulating heavy metals, formaldehyde, phthalates, and forever chemicals like PFAS. At Mulberry Park Silks, the silk fabric used in our bedding and accessory collections conforms to the highest standards in the textile industry. We proudly display our OEKO-TEX® STANDARD 100 certification on our packaging, website, and labels.

Differences Between OEKO-TEX® STANDARD 100 and GOTS

Mulberry Park Silks Products are all certified by OEKO-TEX

There are many different labeling alliances, environmental performance industry initiatives, and organic certification designations available to textile manufacturers. Along with OEKO-TEX®, one of the most common is GOTS (Global Organic Textile Standard). Unlike OEKO-TEX Association OEKO-TEX® STANDARD 100, which tests all types of textiles — from conventional cotton and silk to leather and synthetic fabrics — for harmful substances, Global Organic Textile Standard GOTS specifically focuses on organic textile certification standards.

OEKO-TEX Standard 100 and GOTS both ensure that products are free of harmful chemicals, but GOTS requires a minimum of 70% organic materials. GOTS strictly prohibits the use of synthetic pesticides and genetically modified organisms (GMOs) in it's manufacturing process, while OEKO-TEX can certify both natural and synthetic fabrics regardless of organic content.

Because GOTS applies only to fibers derived from organic agriculture, silk does not qualify for this designation. Although silk is a natural fiber, it is animal-derived rather than plant-based, and there is no recognized organic standard for silk production under GOTS guidelines, which is why understanding organic silk and whether you really need it is so important.

Still, high-quality sericulture depends on carefully managed mulberry cultivation practices and environmentally responsible production facilities to help ensure the health and survival of the Bombyx mori silkworm. Because GOTS certification applies only to plant-based materials, the OEKO-TEX® label is so important when purchasing silk products. Without internationally recognized testing and regulatory standards like OEKO-TEX®, it can be difficult to verify that the silk you purchase online has been tested for harmful substances and meets modern textile safety standards, or to distinguish between different types of silk bedding, pillowcases, and accessories .

Both GOTS and OEKO-TEX® offer consumers confidence that the textiles they purchase are tested for safety. OEKO-TEX® certifies a wide range of materials, including both organic and non-organic textiles. In addition to silk, other OEKO-TEX®-certified fabrics include cotton, bamboo, Tencel, wool, and even leather.

The Health and Wellness Benefits of Mulberry Park Silks

Mulberry Park Silks Ivory Sheet Set

Along with being OEKO-TEX® STANDARD 100 certified, Mulberry Parks Silk products deliver significant benefits to hair, skin, and overall wellness. Knowing that all of our silk sheets , pillowcases , and accessories are entirely safe to use will give you peace of mind as you indulge in all the beauty benefits silk pillowcases and silk sheets have to offer, especially when you understand the science-backed silk pillowcase benefits vs. hype .

Let's begin with hair. Whatever your hair type, if you wake with a head full of tangles, you can likely blame it on friction from your cotton pillowcase. Swapping your cotton pillowcase for a mulberry silk pillowcase will allow your hair to gently glide across the surface rather than snag, no matter how much you toss and turn. You'll wake with hair that's smoother, silkier, and definitely tangle-free, which is why so many people ask whether silk pillowcases are really worth it . Along with tearing at your tresses, cotton also robs hair of essential moisture especially if your hair is coarse, curly, or wiry.

Silk pillowcases are gentle on the skin. As we noted above, a cotton pillowcase is by nature very drying and can undo the good work of even the priciest moisturizer. In contrast, silk is protein-based and can help your skin retain its natural moisture. Silk also reduces friction on delicate facial skin, which can minimize the occurrence of sleep creases and wrinkles. At the same time, silk is hypoallergenic and non-irritating, which means it's gentle on even the most sensitive and acne-prone skin .

Unlike synthetic materials, a silk bedding set is naturally breathable and helps regulate body temperature. One of the main reasons people love sleeping on silk is its luxurious feel, and for good reason. Silk's inherent temperature-regulating properties keep you comfortable year-round, ensuring a restful and rejuvenating night's sleep, and independent lab testing has shown that  Mulberry Park's silk is proven to be gentler on hair

Frequently Asked Questions About OEKO-TEX®

OEKO-TEX Association OEKO-TEX® STANDARD 100 is one of the world’s most recognized textile safety certifications. It verifies that fabrics, trims, threads, dyes, and finished textile products have been tested for over 1,000 harmful substances to help ensure they are safe for human health. Testing includes substances such as heavy metals, formaldehyde, carcinogenic dyes, phthalates, and PFAS (“forever chemicals”). OEKO-TEX® testing covers more than 1,000 potentially harmful textile and leather chemicals. These include heavy metals, formaldehyde, pesticide residues, carcinogenic dyes, phthalates, and PFAS. The restricted substance list is updated annually to reflect the latest scientific research, evolving legal restrictions, and global consumer safety standards, which is one reason our award-winning silk sheets on Amazon are recognized not only for luxury but also for verified safety.

Annual renewal ensures that certified products continue meeting the latest safety requirements and evolving restricted substance standards. Because testing criteria are updated every year, renewal helps maintain ongoing compliance with current scientific and regulatory expectations. OEKO-TEX certification is valid for 12 months and requires annual renewal, which includes re-testing and compliance with updated standards, ensuring ongoing product safety.

OEKO-TEX® certification is valid for 12 months. To maintain certification, brands must complete annual renewal testing through an accredited third-party institute. This re-testing process ensures continued compliance with updated safety standards and restricted substance requirements.

The OEKO-TEX Association offers several certification systems that address different areas of textile sustainability and safety. These include: STANDARD 100 — Tests textiles and components for harmful substances. MADE IN GREEN — Verifies harmful substance testing while also evaluating environmentally responsible production and workplace safety. LEATHER STANDARD — Applies harmful substance testing specifically to leather goods. ECO PASSPORT — Certifies textile and leather processing chemicals for sustainable manufacturing. STeP — Focuses on sustainable textile and leather production facilities.

OEKO-TEX® structures its testing limits based on how closely a product interacts with human skin. Textiles designed for direct skin contact are held to stricter thresholds, and products intended for babies and children face the most rigorous requirements.

OEKO-TEX® certification helps consumers identify products that have been independently tested for harmful substances. As shoppers become increasingly aware of chemical exposure, textile transparency, and product safety, third-party certification can help provide additional confidence in textile purchases. OEKO-TEX® STeP certification evaluates textile, leather, and industrial laundry facilities against rigorous environmental and social responsibility standards. It reflects a company’s commitment to safer working conditions, human ecological safety, socially responsible working conditions, environmentally friendly facilities, and continuous improvement toward more sustainable production methods. OEKO-TEX® certification can strengthen brand credibility by demonstrating a commitment to product safety, transparency, and responsible production practices and environmental accreditation. It is globally recognized and can help brands meet procurement and regulatory requirements from retailers and international buyers who require certified textiles. Brands that carry OEKO-TEX certification can improve consumer trust by demonstrating a commitment to responsible production practices and transparency in their supply chains, especially when offering customizable Grade 6A silk bedding collections.

The MADE IN GREEN label certifies that textile and leather products have been tested for harmful substances and manufactured in environmentally responsible facilities with socially responsible workplace conditions. Consumers can often trace the product’s production journey using a QR code or product ID associated with the label. OEKO-TEX® ECO PASSPORT is a certification system for textile and leather processing chemicals. It helps manufacturers verify that chemical products are suitable for sustainable textile production. The process includes three sequential assessments before certification is granted, just as our affordable outlet silk bedding and accessories are carefully inspected before sale to ensure quality.

About Author

Zoe Doyle

Zoe Doyle

Zoe brings extensive experience in journalism and social media to Mulberry Park Silks, joining the team in 2022. She’s been instrumental in spearheading our affiliate program and creating custom quizzes for a concierge-style shopping experience. As a passionate writer and former esthetician, Zoe combines her love of skincare and beauty to craft insightful blogs about the luxurious world of silk. Outside of work, she's a devoted mom to two daughters.

Favorite Products: Our 22 momme pillowcases, which have tamed her youngest daughter’s curly hair, and our silk scrunchies, a must-have for her older daughter’s fine hair. Once you try them, you’ll see why Zoe and her girls are hooked!

Mulberry Park: Accessible and Affordable Luxury Silk

We founded Mulberry Park with one simple mission: to design the highest quality silk items in the market and offer them at an affordable price. And we've done just that, with a full range of silk products made from 100% pure mulberry long strand silk fabric. The silk fabric used for our silk sheets and silk pillowcases has also been OEKO-TEX® STANDARD 100 certified to be tested for over 1000 harmful chemicals.

Visit us online or call us at (800) 860-1924 to learn more about our silk sheets, silk pillowcases, duvet covers and shams, and real silk accessories including sleep masks, travel pillows, and silk hair scrunchies.