Most claims on a textile label are the seller's own description. Grade, weight and fibre are all asserted by whoever is selling you the fabric. OEKO-TEX is different, because it is issued by an outside institute against a published standard, and it expires.
That makes it worth understanding properly, including its limits.
What STANDARD 100 actually tests
STANDARD 100 by OEKO-TEX is a test for harmful substances in finished textiles. A laboratory tests the actual product against a list of regulated and unregulated substances, including:
- Azo dyes that can release arylamines of concern
- Formaldehyde
- Heavy metals such as lead and cadmium, in extractable form
- Pesticide residues
- Chlorinated phenols
- Phthalates
- pH, because fabric that sits well outside skin-neutral can irritate
Two details make it stricter than people expect. First, the limits are tiered by how much skin contact the product has, and the tier for items worn or slept against the skin is considerably stricter than the one for a curtain. Second, certification covers every component, not just the main fabric. Thread, zip, labels and trim are all tested. A pillowcase can fail on its zip.
The three things it does not cover
This is the part worth being clear about, because the logo gets read as a general seal of goodness.
- It is not an organic certification. It tests the finished fabric for harmful substances. It says nothing about how the raw fibre was farmed.
- It is not an ethical or labour standard. Working conditions and factory practice are covered by different schemes entirely. A certificate tells you what is in the fabric, not who made it or how they were treated.
- It says nothing about quality. This is the big one. A thin, short-fibre, badly finished silk can be fully certified, because it is being tested for what it contains, not for how well it is made or how long it will last. Certification and quality are two separate axes, and a certificate is not evidence of the second.
How to read the claim
A real certification has a certificate number and an issuing institute, and it is renewed on a cycle rather than granted permanently. A seller making the claim should be able to say which institute issued it.
The reasonable way to weigh it: OEKO-TEX answers one specific question well, which is whether the fabric pressed against your face for seven or eight hours a night has been tested for substances you would not want there. It does not answer any of the other questions, and it was never designed to.
So use it as a floor, not a summary. It rules out a category of problem. Everything else about a pillowcase, including whether it will still be smooth in two years, has to be judged on fibre, weight and finish.
The Aveloor Silk Pillowcase is 22-momme Grade 6A mulberry silk, in 17 colours.
Written by Samuel, Founder.
