The Ultimate Guide to Compostable Bag Certifications

Introduction

In the transition to a circular economy, not all “eco-friendly” plastics are created equal. Only certified compostable bags meet rigorous international standards, ensuring they break down safely and completely, leaving no microplastics behind.

In the transition to a circular economy, businesses and distributors are increasingly seeking sustainable packaging alternatives. However, navigating the market can be tricky because not all “eco-friendly” plastics are created equal. For businesses, stocking the right product is essential for brand reputation and legal compliance. Only certified compostable bags meet rigorous international standards, ensuring they break down safely and completely, leaving no toxic residue or microplastics behind.

Whether you are a distributor looking to upgrade your product catalog or a business aiming to green your supply chain, understanding compostable bag certifications is your first step toward true sustainability.

Why Compostable Bag Certifications Matter

For distributors and businesses, selling uncertified products carriers immense reputational and legal risks. Here is why prioritizing certified compostable bags is non-negotiable:

Eliminating Greenwashing

The market is flooded with misleading terms. “Degradable” or “oxo-biodegradable” bags often contain chemical additives that cause the plastic to fragment into harmful elements rather than returning to nature. True compostable bags, on the other hand, are consumed by microorganisms and turn into nutrient-rich biomass, water, and carbon dioxide. Certifications provide undeniable proof that your products are genuinely compostable, protecting your business from accusations of greenwashing.

Regulatory Compliance

Governments worldwide are cracking down on plastic pollution and false environmental claims.

• EU Single-Use Plastics Directive: The European Union has implemented strict bans on oxo-degradable plastics and enforces rigid standards for what can legally be introduced to the market.

• United States Regulations: California leads the US with stringent labeling laws. Products cannot be labeled “biodegradable,” “degradable,” or “decompostable,” and to be labeled “compostable,” they must meet strict certification standards. False advertising can result in hefty fines and product recalls.

The Gold Standards of Certification

To guarantee environmental integrity, compostable bags must adhere to the strictest global standards.

North America—BPI Certified to ASTM D6400 Standard

The Biodegradable Products Institute (BPI) provides the leading certification for North America. Using the ASTM D6400 standard, it verifies that materials will biodegrade at a rate comparable to known compostable materials in industrial facilities. This certification ensures the bags are chemically safe and leave no persistent synthetic polymers in the soil.

Explore more of ASTM D6400 standard in this post: ASTM D6400 Standard: Certification of Compostable Plastic Bags.

European Union—EN 13432 Standard

The EN 13432 is the benchmark for compostable packaging across Europe. It requires a rigorous four-part testing process: disintegration during composting, biodegradation, absence of negative effects on the composting process, and low levels of heavy metals. This standard guarantees that the material will fully transform into high-quality organic fertilizer.

Discover the science behind the EN 13432 standard here: What is the EN 13432 Standard: A Guide to Truly Compostable Packaging.

Australia—AS 4736 and AS 5810 Standard

The AS 4736 standard certifies that products are suitable for industrial composting, featuring rigorous heavy metal restrictions and unique eco-toxicity testing (including earthworm toxicity). Meanwhile, the AS 5810 standard certifies “Home Compostable” products, ensuring they break down at the lower, more variable temperatures found in backyard compost bins.

Dig into the Australian testing criteria in this post: AS 4736 vs. AS 5810: Understanding Australian Compostable Standards.

Global Recognition—OK Compost HOME & OK Compost INDUSTRIAL

Issued by TÜV Austria, these are among the most prestigious and globally recognized labels in the industry. OK Compost INDUSTRIAL ensures the bag is suited for professional composting plants, while the OK Compost HOME label is the “holy grail” of certifications, guaranteeing that the bag will safely and completely decompose in a domestic garden heap without the need for high-heat industrial processing.

Uncover the difference between OK Compost HOME and INDUSTRIAL labels here: A Guide to OK Compost Certification.

Comparison Table

Certification Standard	Region	Composting Condition
ASTM D6400	North America	Industrial
EN 13432	Europe	Industrial
AS 4736	Australia	Industrial
AS 5810	Australia	Home
OK Compost HOME	Global / Europe	Home
OK Compost INDUSTRIAL	Global / Europe	Industrial

How to Verify Compostable Certificate

As a distributor or buyer, you must verify the authenticity of a manufacturer’s claims before bringing their bags to market. Always check for two crucial elements:

• The Official Logo: Legitimate compostable bags will clearly display the official trademarked logo of the certifying body (e.g., the BPI Compostable logo, the seedling logo for EN 13432, or the OK Compost logos).

• The Certificate Number: A logo alone isn’t enough. Authentic products must print their unique certificate number beneath or next to the logo. You can cross-reference this number on the official database of certifying bodies (like the BPI product catalog or TÜV Austria’s certified product search) to ensure the certification is active and valid.

Which Certification Should I Choose?

Selecting the right certification depends entirely on your target market, local regulations, and how the end consumer will dispose of the product. Use this quick guide to find your perfect match:

1. For Industrial/Commercial Composting Facilities

Best for: Supermarket produce bags, municipal food waste liners, and takeaway packaging collected via city-wide organic waste programs.

• EN 13432 (Europe): The gold standard for the European market. It guarantees the material will break down in industrial composting facilities within 12 weeks without releasing harmful residues.

• ASTM D6400 (USA): The mandatory standard for compostable plastics in North America. It ensures the product will disintegrate at a rate similar to natural organic waste in a commercial facility.

• AS 4736 (Australia): The required certification for industrial composting in Australia, strictly regulating heavy metal content and ecotoxicity. This ensures the material poses no eco-toxicity risks to the resulting compost.

2. For Home Composting (Backyard Bins)

Best for: Direct-to-consumer e-commerce packaging, garden waste bags, and agricultural mulch films where access to industrial facilities is limited.

OK Compost HOME & AS 5810

These certifications verify that the material will break down in the lower, more variable temperatures of a backyard compost bin. They ensure degradation over time, leaving absolutely no toxic residue behind in consumer gardens.

Conclusion

Navigating global compliance and compostable bag certifications can be complex. A misstep in product sourcing can lead to unsellable inventory or legal penalties.

If you are unsure which standard applies to your business or target region, our technical team is ready to assist. We will help you select the right certification to ensure your packaging is not only legally compliant but also a truly eco-friendly solution you can confidently offer to your clients.