Biodegradable Straw Certifications: Buyer’s Compliance Guide

Biodegradable straw certification refers to independent verification that a straw meets a defined compostability or biodegradation standard—usually EN 13432 or ASTM D6400—for a specified disposal environment. To verify a supplier’s claim, request the certificate number, issuing body, exact product scope, expiry date, and test reports; confirm the manufacturing site; and check the certifier’s public database. Reject vague “ocean-degradable” or “100% biodegradable” claims unless they name the standard, environment, and timeframe.

As of October 2026, the compliance gap is widening. Marine-degradation studies have reported that some straws marketed as biodegradable retained structure for 8–20 months in seawater, while UNEP’s marine-litter review warns that “biodegradable” is not a marine-disposal guarantee. For overseas buyers, the practical question is not whether a supplier uses the word, but which certificate they can produce and whether it covers the SKU you are importing.

Which certificates count for biodegradable straw certification?

Four credentials dominate B2B straw procurement. They are not interchangeable, and each covers a defined environment.

• EN 13432 certification — the European industrial-compostability standard. It requires at least 90% disintegration within 12 weeks and 90% biodegradation within 6 months, plus ecotoxicity and heavy-metal limits. It does not certify home composting or seawater degradation.
• ASTM D6400 straws — the US equivalent for industrially compostable plastics. A valid report should show ASTM D5338 biodegradation and disintegration data for the finished straw, not only the resin.
• OK Compost — a TÜV Austria mark. “OK Compost INDUSTRIAL” maps to EN 13432; “OK Compost HOME” is a separate, stricter home-composting claim. If a supplier claims marine biodegradability, ask specifically for “OK biodegradable MARINE.”
• BPI certified straws — the US Biodegradable Products Institute mark, based on ASTM D6400. BPI certification is useful for North American retail and foodservice, but it is still an industrial-composting claim.

The key distinction is scope: compostable straw standards prove performance in a managed composting facility, not in the ocean. A certificate for PLA resin does not automatically cover a printed, glued, or coated straw. The certificate must name the finished product family or SKU and the manufacturing site.

Which claims are defensible—and which create greenwashing risk?

Defensible language is specific and qualified: “Industrially compostable under EN 13432; dispose of in commercial composting,” or “BPI-certified compostable straw, ASTM D6400.” Under the EU Green Claims framework and the US FTC Green Guides (16 CFR Part 260), an unqualified “biodegradable” claim needs competent and reliable evidence for the actual disposal environment and a clear timeframe.

Higher-risk claims include “100% biodegradable” on a PLA straw sold without industrial-composting access, “ocean-degradable” without an OK biodegradable MARINE certificate, and “eco-friendly” used as a substitute for proof. These are exactly the phrases regulators and retail compliance teams flag. For a deeper claim-by-claim review, see this biodegradable straw claims compliance guide.

What documentation should an RFQ demand?

Put verification in the RFQ, not in a post-order email. Require the following before you approve artwork or pay a deposit:

1. Current certificate PDF with certificate number, issuing body, product scope, and expiry date.
2. Full test reports behind the certificate—not a one-page marketing summary.
3. Written confirmation that the certificate covers the quoted straw size, coating, print, and glue.
4. Factory name and address matching the certificate and the audit report.
5. Public database verification link or screenshot from BPI, TÜV Austria, or the relevant scheme.
6. Batch-level traceability and a declaration that no unlisted additives or PFAS are used.
7. Approved claims wording for your packaging, website, and Amazon or retail listing.

If any item is missing, treat the claim as unverified. A legitimate supplier can usually return these documents within 2–3 business days. For a full document checklist, use this biodegradable straw certification buyer guide.

How does material choice change compliance and landed cost?

Material choice determines which certificate you can use and what disposal instruction must appear on the pack.

• Paper straws — often recyclable or compostable, but not automatically EN 13432-certified if glued or coated. Indicative FOB China: $0.015–$0.030 per straw; MOQ 50,000–100,000 pieces for custom print. PFAS-free and food-grade glue declarations are essential.
• PLA straws — eligible for EN 13432, ASTM D6400, OK Compost, and BPI, but only industrial composting. Indicative FOB: $0.025–$0.045 per straw; heat resistance and shelf-life claims need test data. Marine claims require a separate marine certificate.
• Bamboo straws — reusable and plastic-free, but not usually certified compostable under EN 13432 or ASTM D6400. Indicative FOB: $0.035–$0.060 per straw; compliance focus shifts to food-contact, phytosanitary, and sustainability sourcing evidence.

Certification adds roughly 3–8% to unit cost at typical volumes, but the larger landed-cost risk is a rejected retail listing or customs hold caused by unsupported claims. Choose the material that matches the disposal infrastructure in your destination market, not the lowest quotation.

FAQ

Q: Is EN 13432 the same as marine biodegradable? A: No. EN 13432 certifies industrial composting, not seawater degradation. For an ocean-degradable claim, request a specific marine certificate such as OK biodegradable MARINE and confirm it names the finished straw.

Q: Can a supplier legally say “biodegradable” without a certificate? A: It can be risky. Under EU Green Claims and US FTC rules, the claim must be substantiated for the stated environment and timeframe. Without EN 13432, ASTM D6400, OK Compost, or BPI evidence, the safer wording is “plastic-free” or “reusable,” not “biodegradable.”

Q: What is the fastest way to check a certificate? A: Ask for the certificate number and issuing body, then verify it in the certifier’s public database. Match the product scope, factory name, and expiry date to your RFQ. A PDF alone is not verification.

Conclusion

Certified proof beats marketing language. Build your specification around EN 13432, ASTM D6400, OK Compost, or BPI, depending on the market, and require documents that tie the certificate to the exact straw you will import. ZTstraw has supplied eco-friendly straws and tableware from China for 30 years, exporting to more than 30 countries; our team can return certificate scope and test documentation with your quotation. Email sales@ztstraw.com or review our range at https://ztstraw.com/products/.