Two certifications come up constantly in PSF buyer conversations. They sound similar, they overlap in marketing language, and they cover very different things. Here's the actual distinction, with the practical decision tree.
The one-line answer
OEKO-TEX Standard 100 tests the finished product for harmful substances. GRS verifies the recycled content and chain of custody. They answer different buyer questions.
What OEKO-TEX Standard 100 actually does
OEKO-TEX Standard 100 is a product safety certification. It tests the textile for substances that could be harmful to human health (formaldehyde, heavy metals, pesticides, phthalates, azo dyes, etc.) at levels safe for skin contact. The test is done on the finished fabric or article, not on the fiber alone.
For PSF, the certification is typically held by the finished fabric mill, not the fiber producer. The fiber mill may also hold a "pre-certification" or "raw material certification" that supports the downstream mill's OEKO-TEX claim, but the official OEKO-TEX Standard 100 label is on the fabric.
What it proves to your buyer: the final product doesn't contain harmful substances above OEKO-TEX thresholds. Required for baby/kids textiles, underwear, bedding sold in EU and many US retailers, and any product with skin contact.
What GRS actually does
GRS (Global Recycled Standard) is a content and chain-of-custody certification. It verifies:
- The recycled content claim (% pre-consumer or post-consumer recycled input)
- Chain of custody from input to output (mass balance, segregation, or both)
- Environmental and social criteria at the certified site (water, chemicals, labor)
- Verification by an independent third-party certifier (Control Union, Ecocert, Intertek, SGS, etc.)
The PSF producer can hold a GRS scope certificate covering the fiber production, and issue transaction certificates (TCs) per shipment. The fabric mill or brand can then issue their own GRS claim based on the supplier's TC.
What it proves to your buyer: the recycled content is real, audited, and traceable. Required for any product marketed with a recycled content claim in EU, US, and increasingly other markets.
Side-by-side
| Dimension | OEKO-TEX Standard 100 | GRS |
|---|---|---|
| Tests what | Harmful substances in the finished product | Recycled content + chain of custody |
| Holder | Finished fabric / article mill | PSF producer (and onward through supply chain) |
| Buyer question it answers | "Is this safe against skin?" | "Is the recycled claim real?" |
| Cost to you | $0 (downstream cost) | ~$0.10-0.15/kg fiber premium |
| Cost to your buyer | $1-3k/year testing | TC fee + chain-of-custody setup |
| Marketing claim | "Tested for harmful substances" | "X% recycled content" |
Decision tree: which one do you need?
- Does your buyer market recycled content? If yes → GRS. Mandatory if you want to make a recycled claim.
- Is the end product for skin contact (baby, underwear, bedding)? If yes → OEKO-TEX Standard 100 on the finished product. Your fiber may not need its own OEKO-TEX, but the downstream mill almost certainly does.
- Are you selling into EU retailers with sustainability commitments? If yes → both are likely required, depending on the brand's specific framework (Higg, ZDHC, EU Ecolabel, etc.).
- Domestic commodity sales (no recycled or safety story)? Then you don't need either yet. Wait for buyer or regulation to drive it.
Common confusion points
- "Is your fiber OEKO-TEX certified?" — Usually the question is whether the fabric is. OEKO-TEX on fiber alone is rare and usually overkill. Check what the buyer actually needs.
- "We need 100% recycled OEKO-TEX." — These are two separate things. OEKO-TEX Standard 100 doesn't certify recycled content; GRS does. OEKO-TEX tests for harmful substances; GRS verifies recycled chain of custody. They can stack (GRS-certified recycled fiber that also passes OEKO-TEX on the finished fabric), but they certify different things.
- "What about RCS?" — RCS (Recycled Claim Standard) is a sister standard to GRS, but without the environmental/social criteria. RCS = "this contains X% recycled material" only. GRS = "this contains X% recycled material AND the producer met environmental/social criteria." For most B2B buyers, GRS is the more useful certification.
The short version
OEKO-TEX is product safety. GRS is recycled content. They're complementary, not competing. If your downstream needs both, the typical stack is GRS on the PSF (fiber producer) + OEKO-TEX Standard 100 on the finished fabric (fabric mill). Don't pay for one when you actually need the other.
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