ASTM D6400 vs D6868: Which Compostability Standard Belongs on Your Certificate (& Why D6866 Is Not the Same Thing)
If you source compostable tableware or food packaging, you have probably been handed a spec sheet covered in three-letter acronyms and told it all means “compostable.” It does not. ASTM D6400, ASTM D6868, and ASTM D6866 answer three different questions, and which one belongs on your supplier’s certificate depends on how the product is built and where it actually breaks down. Get it wrong and you end up with a coated paper cup wearing the wrong label, a composter that rejects your shipment, or an FTC-facing “compostable” claim that outruns your paperwork.
This guide gives procurement and sustainability buyers a practical, standard-by-standard map: what D6400 versus D6868 test, which certificate to demand for uncoated plastics versus coated fiber like paper cups, how BPI, TÜV Austria OK Compost, and CMA line up with each standard, and how to confirm a certificate is real — not a logo dropped into a sales deck. We write it from our own molded bagasse factory in Qingdao, China, where we manufacture bagasse, cornstarch, paper, and cutlery tableware and hold BPI (ASTM D6400), DIN EN13432, and OK Compost HOME certifications. Matching the right standard to the right structure is the first step before you request a wholesale quote.
What Each ASTM Standard Actually Governs
The fastest way to stop confusing these standards is to remember that they describe construction, not an opinion about the environment. Two of them are compostability specifications; one is a carbon-counting test.
ASTM D6400: Industrial Compostability for Plastics
ASTM D6400 is the Standard Specification for Labeling of Plastics Designed to be Aerobically Composted in Municipal or Industrial Facilities. It governs single-material, single-component plastics: a one-resin compostable PLA cup, a PBAT/PLA film, a compostable poly mailer. If your item is essentially one material throughout, D6400 is the specification that applies.
ASTM D6868: Compostability for Coated and Laminated Fiber
ASTM D6868 is the companion specification for products where a film or coating is laminated or extruded onto a substrate — coated paperboard, a kraft mailer with a compostable barrier liner, and, critically for our industry, molded fiber or paper with a moisture-resistance coating. A paper coffee cup, a waxed bowl, or a plate with a grease barrier all route to D6868 because they are a composite, not a single material.
The rule that trips up most buyers is this: under D6868, every layer must independently meet the biodegradation requirements of D6400. You cannot certify a compostable paperboard and then quietly add a conventional polyethylene coating or a non-compostable PE window. The coating itself has to compost. This is exactly where a “certified paper cup” claim gets dangerous — the substrate may be fine, but the barrier is what decides whether the whole unit passes.
ASTM D6866: Biobased Content — a Separate Question
ASTM D6866 is often lumped in with the other two, but it measures something else entirely: the renewable carbon fraction of a material, measured through radiocarbon (carbon-14) analysis. It answers “how much of this comes from biological sources rather than fossil fuel?” — it does not measure biodegradability or compostability. A cup made of 100% biobased PET (sugarcane-derived) can score near-100% under D6866 yet still fail to compost, because bio-PET has the same chemical structure as fossil PET. A compostable blend can carry up to about 10% fossil-based additives and still pass D6400. Do not confuse the two claims: biobased ≠ compostable.
D6400 vs D6868 vs D6866: Side-by-Side Reference Table
| Standard | What it measures | Product structure it covers | Composting environment |
|---|---|---|---|
| ASTM D6400 | Disintegration, biodegradation, ecotoxicity (compostability) | Single-material plastics and films | Industrial (municipal/commercial) |
| ASTM D6868 | Compostability of the whole composite | Paper/fiber + laminated or extruded film/coating | Industrial (municipal/commercial) |
| ASTM D6866 | Biobased (renewable) carbon content only | Any solid, liquid, or gas sample | N/A — not a compost test |
In plain terms:
• D6400 = is this plastic compostable in an industrial facility?
• D6868 = is this coated or laminated fiber product compostable in an industrial facility (every layer included)?
• D6866 = how much of the carbon is renewable?
The Common Performance Bar Behind Both Compost Standards
D6400 and D6868 share the same core thresholds, which is part of the confusion. Both target industrial composting and typically require:
- Biodegradation: at least 90% of the organic carbon converts to CO₂ within 180 days under controlled conditions.
- Disintegration: the material breaks down so that pieces pass through a 2 mm screen within 12 weeks.
- Ecotoxicity: the residual compost supports plant growth (germination and biomass versus a control), usually via OECD 208 or similar.
- Heavy metals: regulated metals stay within caps (referenced against the EPA’s 40 CFR Part 503.13 land-application limits).
These thresholds are demanding, and they test the finished formulation — additives, colorants, inks, adhesives, and labels all count. A compostable film with a conventional pressure-sensitive label or a pigment that inhibits microbial activity can fail even when the base resin is fine.
How the Certification Schemes Map Onto D6400 and D6868
A standard is a test method; it is not a consumer-facing logo. That is what certification bodies add. Match the mark to your market and to the exact claim you intend to print.
BPI (United States)
The Biodegradable Products Institute certifies products to ASTM D6400, D6868, and the newer D8410 for industrial composting in North America. The BPI logo is the mark most US commercial composters and municipalities recognize, and many facilities accept only BPI-certified items. BPI also screens for total fluorine — a PFAS proxy — which matters now that several states restrict intentionally added PFAS in food packaging. When your downstream is North American commercial composting, BPI is usually the mark to require.
TÜV Austria OK Compost (Europe) and EN 13432
In the EU, the harmonized standard is EN 13432, certified through TÜV Austria’s OK Compost scheme (legacy name Vincotte) or DIN CERTCO, using the Seedling logo. Crucially, OK Compost has two tiers that are not interchangeable:
- OK Compost INDUSTRIAL certifies to EN 13432 for managed industrial composting.
- OK Compost HOME certifies to lower-temperature, ambient-conditions composting for backyard bins.
The single most common cert-literacy error is treating “OK Compost” as one claim. A product carrying OK Compost INDUSTRIAL is not certified for home composting. When a supplier cites “OK Compost” without the tier, that omission is the first question you should ask.
CMA Field Tested
The Compost Manufacturing Alliance fills a different gap. Lab certification proves a material can meet the standard under controlled conditions; it does not prove a given facility will accept it. Real composting operations run on their own cycle time, and many North American facilities run shorter cycles than the lab timeframe and reject films, liners, or thicker fiber regardless of a lab mark. CMA runs field disintegration testing of already-certified materials in real commercial operations across windrow, aerated static pile, and covered in-vessel systems — some facilities, such as A1 Organics, will only accept materials that carry CMA testing. If your claim depends on the package actually being composted, CMA Field Tested on top of BPI is the stronger evidence.
Which Certificate You Should Demand, Scenario by Scenario
| If your product is… | Demand this certificate | Why |
|---|---|---|
| Single-resin compostable plastic (PLA cup, PBAT/PLA film) | ASTM D6400 via BPI | Single material, one standard applies |
| Paper/fiber cup, bowl, or plate with a compostable coating or liner | ASTM D6868 via BPI | Every layer must independently pass D6400 |
| Uncoated cellulosic fiber only | ASTM D8410 via BPI | Fiber-only spec, no thermoplastic lamination |
| Selling into the EU | EN 13432 via TÜV Austria / DIN CERTCO | EU harmonized standard |
| Home-compostable claim | OK Compost HOME / NF T 51-800 / BPI Home | Ambient-temperature scheme, not industrial |
| End-of-life depends on a specific facility | CMA Field Tested on top of the above | Facility acceptance ≠ lab certification |
Verifying a Certificate Is Real (Not Just a Logo)
A logo dropped into a supplier deck proves nothing. The certificate number — issued to a named license holder against a named standard — is the part that matters. Here is the verification path we recommend before you approve a supplier:
- Get the number, not the logo. Ask for the certificate number and the standard it was issued against.
- Check the certifier’s public registry. Confirm the number resolves to a live, in-name certificate at BPI, TÜV Austria, or DIN CERTCO.
- Match it to your exact structure. BPI certifies a specific material and configuration. If the supplier changed the coating, resin, or a color masterbatch, the prior certificate may not extend to the new build. Name the configuration in the purchase order.
- Check the expiry. D6400 certifications typically renew every 1–3 years; a certificate from three years ago may be void if a component changed.
- Ask for the test report, not just the certificate. The report shows the raw biodegradation curve, disintegration results, and ecotoxicity data for your product — not a similar one.
A supplier who can name the standard, the tier, the certificate number, and the accepting facilities is quoting a real product. One who says “it is all certified” is quoting a marketing claim.
Common Mistakes Buyers Make
- Treating an industrial-certified item as home-compostable. Most households cannot reach the 55–60 °C a managed industrial pile holds, so a material engineered for industrial heat may sit nearly intact in a backyard bin for a year. An unqualified “compostable” label on industrial-only material is a classic FTC Green Guides enforcement trigger.
- Using D6866 to claim compostability. High biobased content does not equal compostability. Bio-PE and biobased PET prove the point.
- Assuming the substrate alone decides the outcome. On a D6868 product, the coating is the deciding factor. A “natural” kraft bowl lined with a lining thicker than a couple of millimeters may fail disintegration even if the paper scores 90% biobased.
- Ignoring inks, adhesives, and labels. Every component counts, because each must independently compost.
How This Applies to Bagasse Tableware
Because the average buyer is sourcing a mix, the practical takeaway matters. Uncoated molded bagasse tableware — our clamshells, plates, and compartment trays — is naturally high in renewable carbon (typically above 98% biobased under D6866) and compostable at commercial facilities in roughly 60–90 days, so it routes to D6400-based BPI certification without modification, as long as no non-compostable coating is added. A paper coffee cup or a coated paper bowl carries a moisture barrier, so it routes to D6868, and the barrier itself must pass D6400 thresholds. A PLA cold cup follows D6400, though the result depends on thickness and formulation — thin films often pass while thick injection-molded items may fail disintegration. If you need to print both “certified compostable” and “made with renewable materials,” request both the D6400/D6868 certificate and the D6866 report from your supplier, and make sure each covers the exact SKU on your purchase order.
Frequently Asked Questions
What is the difference between ASTM D6400 and ASTM D6868?
Both are US industrial-composting specifications, and the split is by construction. ASTM D6400 covers single-material plastics — a PLA cup, a poly film, a single-resin pouch. ASTM D6868 covers products where a film or coating is laminated or extruded onto a substrate, such as coated paper, a kraft mailer with a barrier liner, or molded fiber with a moisture coating. The key rule in D6868 is that every layer must independently meet D6400’s biodegradation requirements — you cannot hide a non-compostable coating behind a compostable board. Pick the standard by your structure, not by convenience.
Does D6866 mean my product is compostable?
No. ASTM D6866 measures only the fraction of renewable (biobased) carbon using radiocarbon analysis. It tells you nothing about whether the material will disintegrate or convert to CO₂ in a compost facility. A sugarcane-derived bio-PET cup can score near-100% biobased yet fail to compost, while a compostable blend can contain fossil additives and still pass D6400. If you must make both claims, verify each one with its own test.
Is BPI certification the same as ASTM D6400?
No. ASTM D6400 is a test specification that defines the thresholds; BPI is a certification body that tests products against that specification and licenses a logo on the basis of that testing. “Meets ASTM D6400” is a claim a supplier can assert on their own, while a BPI certification is third-party audited and verifiable in a public registry. For a US industrial-compostable claim, demand BPI certification with the certificate number, not just a “meets” statement.
Why do some composters require CMA on top of BPI?
Because lab certification and facility acceptance are different things. BPI certifies to controlled lab conditions, but many North American composters run shorter cycles than the lab timeframe and reject film, liners, or thicker fiber regardless of a lab mark. CMA (Compost Manufacturing Alliance) runs field disintegration testing in real commercial operations across windrow, aerated static pile, and in-vessel systems, and some facilities only accept materials that carry CMA Field Tested certification.
Does D6868 or D6400 mean the product is home-compostable?
No. Both are industrial-composting specifications and are not transferable to home conditions. Home composting is ambient — a backyard bin does not hold the thermophilic phase that an industrial facility does. For a home-compostable claim, you need a separate certificate such as OK Compost HOME, NF T 51-800, or BPI’s Home Compostability mark, which typically require at least 90% degradation within 12 months at ambient temperature. Always keep the claim matched to the certificate you actually hold.
How do I verify a supplier’s certificate is real?
Ask for the certificate number and the standard it was issued against, then confirm it resolves to a live, in-name certificate in the certifier’s public registry (BPI, TÜV Austria, or DIN CERTCO). Ask for the test report rather than just the certificate, confirm the test was run on the exact product you are buying (not a similar one), and check the expiration date. If the supplier hesitates to share these, treat it as a red flag.
Source Certified Compostable Tableware Direct From Our Factory
At our molded bagasse factory in Qingdao, China, we manufacture bagasse, cornstarch, paper, and cutlery tableware and hold the certifications that match the way we ship to you: BPI (ASTM D6400), DIN EN13432, OK Compost HOME, plus FDA and LFGB for food contact. That means we can speak to the certificate-to-structure mapping above from the factory floor — whether your item is an uncoated bagasse clamshell routing to D6400, a coated paper cup routing to D6868, or a PLA piece where thickness decides the outcome.
We supply factory-direct wholesale with flexible MOQ, OEM and custom logo printing, and 24-hour quotes. If you have a structure and an intended sustainability claim, send it to us and we will confirm which standard and certificate apply — and back it up with documentation. Message us on WhatsApp at +86 176 8572 4081, email bygj3@qdbiotrade.com, or request a wholesale quote. Samples are available so you can verify the material and its documentation before you commit.
Explore Our Range & Related Guides
Deepen your sourcing and sustainability knowledge with these related reads:
- Compostable Certifications: The 2026 Buyer’s Guide — a full walkthrough of BPI, TÜV, OK Compost, and the certification stack.
- Compostable Packaging Disposal Guide — what actually happens to certified packaging at end of life.
- How to Verify Compostability Certifications — step-by-step registry-checking for buyers.
- Our Certifications — see the standards behind our bagasse tableware.
