Compostable Straw Certifications: B2B Buyer Guide

Compostable Straw Certifications: B2B Buyer Guide

B2B buyers verify compostable straw certifications for EU/UK compliance by checking three things: a valid EN 13432 test report, a recognised certification logo (TÜV Austria OK compost, DIN CERTCO, or BPI), and a certificate that names the exact straw SKU, resin grade, and production site. Self-declared “biodegradable” labels do not satisfy regulators, retail auditors, or EU SUP directive enforcement in 2026.

As of 2026, greenwashing scrutiny has shifted from marketing copy to paperwork. Retail groups, foodservice chains, and customs authorities now request certificate numbers before purchase orders are confirmed. This guide explains which standards matter and the questions that separate certified suppliers from claim-only suppliers.

What Compostable Straw Certifications Must Prove

EN 13432 certification is the European benchmark for industrially compostable packaging and tableware. It is not a resin test — it applies to the finished article. A straw must pass four requirements:

• Disintegration: 90% of the material breaks into fragments smaller than 2 mm within 12 weeks.
• Biodegradation: 90% conversion to CO₂, water, and biomass within 6 months.
• Chemical safety: heavy metals and fluorinated compounds below strict limits.
• Ecotoxicity: the resulting compost supports plant growth without harm.

Because certification follows the finished product, a supplier holding a certified resin pellet is not automatically selling a certified straw. Ask for the certificate that names the straw dimensions and material composition you are buying. Our guide to compostable straw certification requirements breaks the document checklist down market by market.

BPI Compostable Straws and the North American Bridge

BPI (Biodegradable Products Institute) certification is the dominant North American scheme and is built on ASTM D6400. The technical thresholds mirror EN 13432 closely, so many manufacturers obtain both. For buyers shipping to the US, Canada, or to global foodservice chains that standardise on a single logo, BPI compostable straws are usually the required specification.

Other schemes worth recognising include TÜV Austria’s OK compost INDUSTRIAL and OK compost HOME, DIN CERTCO’s seed logo, Australia’s AS 4736, and the international ISO 17088 standard. Home-compostable marks (OK compost HOME, AS 5810) use lower temperatures and are stricter — useful for retail, rarely required for foodservice.

Biodegradable Straw Regulations Under the EU SUP Directive and UK Law

The EU Single-Use Plastics Directive (EU) 2019/904 banned plastic straws from 3 July 2021, and its definition of “plastic” includes bio-based and compostable polymers. Several member states, including France and Italy, operate national derogations permitting certified compostable straws where home-compostability or separate collection is demonstrated. The practical consequence: certification evidence decides whether a shipment is compliant or detained. Buyers can review the European Commission’s single-use plastics rules for current scope.

In the UK, England’s single-use plastic ban also covers compostable and biodegradable plastics, with exemptions for medical and pharmacy use; Scotland and Wales apply comparable rules. In both markets, “biodegradable” is not a legal claim — only certified compostability backed by documentation is. Our explainer on biodegradable straw certification covers how these claims differ technically.

Seven Questions to Ask Every Straw Supplier

1. Which certificate number covers this exact straw SKU, and can I verify it on the issuing body’s public database?
2. Does the certificate name the manufacturing site, or only the parent company?
3. Is the certification industrial or home compostable — and does that match my waste stream?
4. What is the maximum shelf life, and how does compostability hold after 12 months in storage?
5. Will you provide the full test report, not just logo artwork?
6. What is the MOQ for certified stock sizes versus custom-printed straws?
7. Can you supply a declaration of compliance for EU customs and retail audits?

At ZTstraw, a 30-year manufacturer exporting to more than 30 countries, standard compostable straw sizes ship from 10,000 units and custom-printed runs from 50,000 units, each order accompanied by a full documentation pack.

FAQ: Compostable Straw Certifications

Q: Is EN 13432 the same as BPI certification?
A: No. EN 13432 is the European standard, while BPI certification is based on ASTM D6400. Both require 90% biodegradation within 6 months under industrial composting conditions, so many suppliers hold both marks.

Q: Do compostable straws need to be home compostable for EU or UK compliance?
A: Usually not. Industrial compostability under EN 13432 is the standard requirement. Home-compostable marks such as OK compost HOME or AS 5810 are stricter and mainly relevant to retail packaging and specific national schemes.

Q: How long does certification take and what does it cost?
A: Independent labs typically need 8–16 weeks and charge roughly €3,000–€8,000 per product family. Certificates are usually valid for 3–5 years with annual surveillance fees.

Conclusion

Compostable straw certifications are a procurement control, not a marketing accessory. Verify the certificate number, confirm that the SKU and production site are named, and match the certification type to your actual waste infrastructure before you sign. Buyers who do this avoid greenwashing exposure, customs delays, and retail delisting.

Need certified compostable straws with documentation ready for EU and UK audits? Email sales@ztstraw.com or browse the full range at https://ztstraw.com/products/.