BPI Certified Compostable Straw Supplier Guide: EU and US

Which certifications are required for compostable straws in the EU and US? In the EU, compostable straws must meet EN 13432 to make a compostability claim under the EU Single-Use Plastics Directive; in the US, ASTM D6400 certification is the core standard, with BPI certification as the leading third-party verification. As of 2026, a compliant BPI certified compostable straw supplier should also provide AS 4736 documentation for Australia and local food-contact evidence.

Certification Landscape: BPI, EN 13432, ASTM D6400, and AS 4736

These standards are not interchangeable. Each defines compostability in a specific market, and buyers should match the certificate to the destination country, product SKU, and disposal stream.

• BPI certification: A US third-party program that verifies products against ASTM D6400 or ASTM D6868. It is product-specific, not supplier-specific, and must be renewed annually.
• EN 13432 compostable straws: The EU harmonized standard for industrial compostability. It requires at least 90% disintegration within 12 weeks, 90% biodegradation within 6 months, and passing ecotoxicity and heavy-metal limits.
• ASTM D6400 certification: The US standard for compostable plastics. It also requires 90% biodegradation within 180 days and 90% disintegration within 12 weeks under industrial composting conditions.
• AS 4736: The Australian industrial compostability standard. AS 5810 covers home compostability, which is a separate and stricter claim.

BPI certification is voluntary in most US states, but many composters and large foodservice buyers require it. For EU-bound orders, EN 13432 is the practical baseline; the EU Single-Use Plastics Directive restricts single-use plastic straws, and compostable alternatives need local acceptance and documented certification.

Documents Buyers Should Request from a BPI Certified Compostable Straw Supplier

Straw compliance documentation should be reviewed before purchase orders are signed. A certificate that lists only the factory name is not enough; it must match the exact straw material, dimensions, and SKU.

1. BPI certificate of conformity: Check product name, SKU, certification date, expiry date, and the standard cited, such as ASTM D6400.
2. ASTM D6400 test report: Issued by an ISO 17025-accredited laboratory, with biodegradation, disintegration, ecotoxicity, and heavy-metal results.
3. EN 13432 test report: Required for EU buyers, even if the supplier also holds BPI certification.
4. AS 4736 or AS 5810 report: Needed for Australia and New Zealand, depending on industrial or home compost claims.
5. Food-contact declarations: FDA 21 CFR or EU 10/2011 compliance for the straw material and any coatings or inks.
6. Raw material traceability: Supplier declarations for PLA, PHA, paper, or bagasse, plus batch codes that link finished straws to raw material lots.

A BPI certified compostable straw supplier should provide these files within 2-3 business days of a documented request. If the supplier delays or sends generic certificates, treat it as a greenwashing risk. For a step-by-step buyer audit, see this certified compostable straws supplier checklist.

How Certification Affects Import Compliance and Procurement

Certification influences customs clearance, retail packaging claims, and waste-stream acceptance. In the EU, importers may need to show EN 13432 evidence if a product is labeled compostable. In the US, state labeling laws and composter rules increasingly require ASTM D6400 certification, and BPI certification is the most recognized proof.

• Customs and import: Keep certificates, test reports, and declarations with commercial invoices. Mismatched SKUs can trigger delays or product seizure.
• Restaurant procurement: Chains often require BPI or EN 13432 certificates before adding a straw to approved lists. Certification also protects against greenwashing lawsuits.
• Retail compliance: Packaging claims such as ‘compostable’ must be substantiated. FTC Green Guides in the US and EU consumer protection rules both expect competent and reliable evidence.
• Cost and MOQ: As of 2026, MOQ is typically 50,000-100,000 pieces per size and color. Unit costs range from $0.012 to $0.035 depending on material and printing; lead time is 15-25 days after sample approval.

For a deeper comparison of the two most requested programs, read BPI vs EN 13432. The key procurement takeaway is simple: ask for product-level certificates, not brand-level claims.

FAQ: BPI Certified Compostable Straw Supplier

Q: Is BPI certification legally required in the US?
A: No federal law requires BPI certification. However, some states, cities, composters, and large foodservice buyers require ASTM D6400 certification or BPI approval for compostable products. In practice, BPI is the most accepted US verification.

Q: Can EN 13432 replace BPI certification for US buyers?
A: No. EN 13432 is an EU standard. US buyers should request ASTM D6400 certification and, where required, BPI listing. Dual certification is common for suppliers exporting to both regions.

Q: What is the typical MOQ for certified compostable straws?
A: Most factories quote 50,000-100,000 pieces per size and color. Custom-printed or specialty-material straws may require 100,000 pieces or more. Lead time is commonly 15-25 days after artwork and sample approval.

Conclusion

Cut through greenwashing by matching BPI, EN 13432, ASTM D6400, and AS 4736 to your market. Request product-level straw compliance documentation and verify the SKU before ordering. ZTstraw has manufactured eco-friendly straws and tableware for 30 years and exports to 30+ countries. Contact sales@ztstraw.com or visit our products page for certified samples and documentation.