If you have shopped for silk bedding, you have seen the words "OEKO-TEX certified" on product pages and packaging. It sounds reassuring, but few shops explain what it means.
Here is a plain explanation of the label you will see most often, what it tells you about a silk pillowcase, and how to check that a claim is real.
The short answer: OEKO-TEX STANDARD 100 is an independent label for textiles that have been tested for a list of harmful substances. It tells you about chemical safety. It does not tell you the silk is organic, how good the silk is, or how it was produced.
What OEKO-TEX is
OEKO-TEX is an association of independent textile testing institutes. It runs several labels. The one you will meet most on bedding is STANDARD 100 by OEKO-TEX.
A product with this label has been tested in a laboratory against a published list of substances that can be harmful to health, with a limit set for each one. The list covers substances that are regulated by law and others that are not, and it is reviewed regularly.
What the STANDARD 100 label covers
The useful detail is that the test applies to every part of the product, not only the main fabric. For a pillowcase, that means the silk, the sewing thread, the zipper and any label stitched inside.
Products are also sorted into classes according to how much contact they have with skin. Items for babies are held to the strictest limits. Bedding and anything else worn or used directly against the skin sits in a class with tighter limits than, say, curtains.
For something you rest your face on every night, that is a sensible thing to want to know.
What it does not mean
This is where the label is often misread.
| People assume | What the label actually says |
|---|---|
| The silk is organic | No. It is about substances in the finished product, not how the fibre was farmed. |
| The silk is high quality | No. Quality is shown by fibre type, grade and momme. |
| The fabric is real silk | No. Polyester satin can carry the same label. |
| The product is good for skin problems | No. It is a test for harmful substances, not a health or skincare claim. |
| The whole brand is certified | No. A certificate covers specific products or materials. |
OEKO-TEX has other labels that look at different things, such as how and where a product was made. They are separate from STANDARD 100, so check which one a shop is actually naming.
How to check a label yourself
A genuine label is easy to verify, and it takes a minute.
- Find the label number. A real STANDARD 100 label shows a number and the name of the testing institute. A logo with no number is not enough.
- Use the label check on the OEKO-TEX website. Enter the number and it will tell you whether the certificate is valid.
- Read who holds it. The result names the company and the kind of articles covered. Often the certificate belongs to the fabric mill or the manufacturer, not the shop selling to you.
- Check that it matches. The articles described should match what you are buying. A certificate for cotton towels says nothing about a silk pillowcase.
- Check the date. Certificates are issued for a limited period and have to be renewed.
If a shop says "OEKO-TEX certified" and cannot give you a number, ask for it. An honest seller will have it to hand.
What else to look for when you buy silk
The label answers one question. To judge the silk itself, read the rest of the description.
- Fibre content. It should say 100% mulberry silk, on both sides.
- Grade. Grade 6A describes long, even silk filaments.
- Momme. This is the weight of the fabric. Our guide explains what momme means and which weight to choose.
If you want to be sure the fabric is silk at all, there are a few simple ways to tell whether silk is real. You can also read how mulberry silk is made, from cocoon to finished cloth.
Questions people ask
Is OEKO-TEX the same as organic?
No. Organic certification is about how a fibre is grown and processed. STANDARD 100 is about whether the finished textile has been tested for harmful substances. A product can have one without the other.
Is silk without the label unsafe?
Not necessarily. The label is voluntary, and plenty of good silk is sold without it. It simply means that a particular product has been independently tested. Without it, you are relying on the seller.
Does the label matter if I have sensitive skin?
It can be one useful piece of information, because it tells you the product was tested against set limits. It is not a medical assurance. If your skin reacts to fabrics or detergents, talk to a doctor or dermatologist. Our article on whether silk is hypoallergenic explains what silk can and cannot do.
A label is a good question to ask, not the whole answer. When you compare silk pillowcases or silk bedding sets, read the fibre, the grade and the momme too, and check any certificate number you are given.
