EN 13432 vs ASTM D6400: Compostability Standards Compared

EN 13432 and ASTM D6400 are technical twins - 90% biodegradation within 180 days, 90% disintegration within 12 weeks, the same ecotoxicity threshold - but they are enforced under two different legal systems. This guide walks through seven parameters side by side, then maps the regional compliance paths you need before a cellulose film can carry a "compostable" claim in either market.

1. Why Two Standards Govern One "Compostable" Claim

Walk into any European trade show and the word "compostable" appears on at least half the packaging booths. Walk into a US supermarket and the same word appears on maybe one in ten. The asymmetry is not about chemistry — it is about which regulator has decided that "compostable" is a legally enforceable claim.

In the EU, the EU waste and recycling policy framework — soon to be replaced by the Packaging and Packaging Waste Regulation (PPWR) 2025/40 under the EU single market framework — defines compostable packaging through EN 13432. If a packaging product carries the word "compostable" anywhere in the European Union, passing EN 13432 is a legal requirement, not a voluntary label.

In North America, ASTM D6400 plays a parallel role. ASTM International publishes the technical rulebook; the Biodegradable Products Institute (BPI) operates the third-party certification scheme that verifies compliance. The two systems cover the same chemistry but live under different legal frameworks — one anchored to the EU single market, the other to US and Canadian state-level waste and labeling laws.

The practical consequence: a natural cellulose film sold into both regions typically needs two certifications. A film certified to one only is blocked or legally restricted in the other. At Zhejiang Xiade New Material Co., Ltd. (XIADE), we have spent more than 14 years engineering regenerated cellulose films that meet both standards, and the way to think about the choice is parameter-by-parameter rather than "better" vs "worse."

The seven parameters that actually matter

The standards converge on four technical requirements (biodegradation, disintegration, ecotoxicity, heavy metals) and diverge on three institutional requirements (scope, region, certifying body). The table in Section 4 spells them out. The narrative below explains each row.

2. EN 13432: The European Composting Passport

EN 13432 is a European harmonised standard published by the European Committee for Standardization (CEN). Officially titled "Packaging — Requirements for packaging recoverable through composting and biodegradation — Test scheme and evaluation criteria for the final acceptance of packaging," it defines the test scheme and evaluation criteria for any packaging claiming industrial compostability in the EU market.

The standard sets four parallel requirements that a packaging product must meet to be considered EN 13432-compliant:

1. Biodegradation: at least 90% of the organic carbon must convert to CO2 within 180 days under controlled industrial composting conditions, measured per ISO 14855 (the aerobic composting test aligned with ASTM D5338) or OECD 301B.
2. Disintegration: after 12 weeks of composting with biowaste, less than 10% of the original dry mass may remain on a 2 mm sieve. This is the "you can't see it anymore" test.
3. Ecotoxicity: the final compost must be tested on at least two plant species. Germination and growth results must show no negative effect versus a control compost.
4. Heavy metals: the product must not introduce significant concentrations of regulated heavy metals, with thresholds aligned to the EU Ecolabel and the German Federal Compost Quality Ordinance (BioAbfV).

The TÜV Austria OK Compost Industrial mark and the DIN CERTCO seedling mark are the two most recognised third-party certifications aligned with EN 13432. Testing is conducted in ISO 17025-accredited laboratories; certification cycles typically run 6 to 9 months from sample submission to certificate issuance.

XIADE's regenerated cellulose films are tested under ISO 14855 with 90% conversion achieved within 84 days for uncoated grades and 120 days for coated grades — both comfortably inside the 180-day threshold.

Why EN 13432 is more than a voluntary label in the EU

Under the EU Packaging Waste Directive 94/62/EC and successor regulation PPWR 2025/40, member states are required to recognise EN 13432 as the compliance benchmark for compostable packaging. A product that makes a "compostable" claim without EN 13432 certification is treated as misleading under the Unfair Commercial Practices Directive and may be withdrawn from the market. From August 2026 onward, PPWR Article 8 narrows the use of compostable packaging to organic-waste streams; member states can still impose additional requirements, but the baseline test scheme remains EN 13432.

3. ASTM D6400: The North American Technical Twin

ASTM D6400 is the technical rulebook published by ASTM International for North America. Officially titled "Standard Specification for Labeling of Plastics Designed to be Composted in Municipal or Industrial Facilities," it sets the test scheme and evaluation criteria for any plastic — including films, bags, and coated substrates — claiming industrial compostability in the US and Canadian markets.

The technical requirements are nearly identical to EN 13432:

1. Biodegradation: at least 90% conversion to CO2 within 180 days under controlled industrial composting conditions, measured per ASTM D5338 (the US equivalent of ISO 14855) or OECD 301B.
2. Disintegration: after 12 weeks of composting, less than 10% of the original dry mass may remain on a 2 mm sieve.
3. Ecotoxicity (plant toxicity): the final compost must be tested on at least two plant species; no harmful effects on plant emergence or growth versus a control group.
4. Heavy metals: 11 regulated heavy metals must stay below 50% of the US EPA 40 CFR Part 503 pollutant limits for sewage sludge applied to land.

One additional detail that EN 13432 does not require: ASTM D6400 specifies that any organic polymer or modifier added to the formulation at levels between 1% and 10% of total mass must undergo separate biodegradability testing. This is relevant for cellulose films with surface coatings, plasticizers, or antimicrobial additives — a coated film cannot be approved on the base-film test alone.

Certification is handled by the Biodegradable Products Institute (BPI), which operates the third-party verification scheme for ASTM D6400. BPI's mark on a product is the practical signal that the product has passed ASTM D6400 testing in an ISO 17025-accredited lab and is listed in the BPI Certified Compostable Product Catalog. BPI and TÜV Austria OK Compost Industrial are widely treated as equivalent certifications of equivalent standards.

Why ASTM D6400 sits below EN 13432 in legal weight

ASTM D6400 is not directly enforced by federal law in the US. Federal Trade Commission Green Guides (16 CFR Part 260) restrict unqualified "compostable" claims without competent scientific evidence; ASTM D6400 testing satisfies that burden. At state level, California's SB 54 and similar extended producer responsibility (EPR) statutes increasingly require ASTM D6400 or BPI certification for compostable packaging claims. In Canada, provincial regulations follow the same pattern. The legal framework is more fragmented than the EU's but the practical rule is the same: no certification, no claim.

4. Side-by-Side Comparison: 7 Parameters

The following matrix is the specifier's quick reference. Rows marked identical mean the threshold is the same; rows marked differs point to a divergence that affects certification scope or compliance path.

The "differs" rows are the operational ones. If you ship to the EU only, EN 13432 is the legal requirement. If you ship to the US only, ASTM D6400 plus BPI listing is the practical requirement. If you ship to both, you run both certification programs in parallel — they are not interchangeable.

Three practical consequences of the matrix

First, EN 13432 is mandatory under EU law; ASTM D6400 is technically voluntary but practically required because retailers and brand owners demand BPI listing. Second, EN 13432 has stricter heavy-metals thresholds (notably cadmium at 0.5 mg/kg dry matter and lead at 100 mg/kg dry matter) than ASTM D6400; a film certified to EN 13432 generally meets ASTM D6400, but the reverse is not always true. Third, ASTM D6400 triggers additional testing for additives in the 1%–10% range, which lengthens the certification cycle for coated films.

5. Industrial vs Home Composting: What EN 13432 and ASTM D6400 Do Not Cover

Both EN 13432 and ASTM D6400 certify industrial composting only. Industrial facilities maintain 58 °C aerobic conditions with controlled humidity and aeration — conditions a backyard pile rarely reaches. A film that disintegrates in 12 weeks in an industrial facility may take 6 to 18 months to disappear in a home pile, depending on local climate, pile maintenance, and microbial activity.

For products sold to home composting consumers, separate certifications apply:

• TÜV Austria OK Compost HOME: the European baseline for home-compostable packaging. Tested at ambient temperatures (typically 20–30 °C) with garden compost.
• AS 5810 (Australia): the Australian home-composting standard, aligned with TÜV OK Compost HOME.
• NF T51-800 (France): the French home-composting standard, recognised by ADEME.

Natural cellulose films degrade well in home piles — the polymer is biologically accessible — but a manufacturer must verify that performance under one of these home-composting standards before making a home-compostable claim. Inferring home compostability from EN 13432 alone is a greenwashing risk that the EU and US regulators increasingly flag.

The home-composting paradox for cellulose films

Regenerated cellulose actually has a structural advantage in home composting versus PLA or PHA: it does not require industrial temperatures to initiate microbial breakdown. Wood-pulp-derived cellulose films have been observed to fully disintegrate in 8 to 14 weeks in well-maintained home piles under ambient European conditions. At XIADE, we recommend that home-composting marketing claims be backed by TÜV OK Compost HOME or AS 5810 testing, not by EN 13432 extrapolation. The chemistry is on your side; the documentation has to follow.

6. Why Cellulose Films Pass Both Standards Without Certification Theater

One structural advantage of regenerated cellulose is that the polymer itself is the compostable substrate. There is no need to blend with PLA, PHA, starch, or other biodegradable additives to hit the 90% threshold. The cellulose chain — a glucose polymer repeating unit — is enzymatically accessible to microbial breakdown across a wide pH and temperature range.

The chemical pathway is straightforward. Under aerobic composting conditions, cellulose is hydrolysed by cellulase enzymes produced by bacteria and fungi in the compost microbiome. The resulting glucose monomers are mineralised to CO2 and water through standard aerobic respiration. The biomass that remains is indistinguishable from the rest of the compost matrix within the 180-day window.

Coatings complicate the picture slightly. A nitrocellulose or PVdC coating on a cellophane film reduces the rate of enzymatic access and can extend biodegradation beyond 180 days. XIADE's R&D practice is to design coatings that are themselves biodegradable (wax-based or acrylic emulsion grades) so the composite film still passes ISO 14855 within the threshold. Coatings using conventional plastics (PE, PP, PET) cannot meet either standard.

What we measure in our own R&D

XIADE runs biodegradation testing under ISO 14855 on every new film grade before commercial release. The 180-day threshold is met with a comfortable margin for all uncoated cellulose grades; coated grades are tested in their final laminated form. For customer projects that require formal certification, we coordinate with TÜV Austria and BPI-listed labs to manage the dual certification cycle.

One operational note: certification cycles for a new formulation take 9 to 14 months total when running EN 13432 and ASTM D6400 in parallel. Most of that calendar time is the 180-day biodegradation incubation plus 12-week disintegration incubation; lab scheduling and report review add another 6 to 8 weeks. Plan certification into a new product timeline at the start, not at the end.

7. Regional Compliance Paths: EU EPR, PPWR 2025/40 & US EPR Programs

Standards compliance is the chemistry half of the problem. The other half is registration in the Extended Producer Responsibility (EPR) schemes that the standards ride on. Skipping EPR registration is one of the most common reasons compostable packaging gets held at customs or refused by retailers.

EU: LUCID, Triman, CITEO and PPWR 2025/40

Germany's LUCID register (Verpackungsregister) requires every producer / first-distributor of packaging to register before placing packaged goods on the German market. France's Triman logo and CITEO compliance scheme require similar registration for household packaging. With PPWR 2025/40 entering force, all member states will harmonise around a central EPR register from 2027; until then, country-by-country registration is the rule.

PPWR 2025/40 adds one specific requirement for compostable packaging: from August 2026 onward, any compostable-labeled packaging must be destined for biowaste collection — meaning it must be compatible with the member state's organic waste stream. EN 13432 is the technical baseline; PPWR is the legal wrapper.

North America: BPI Listing + State EPR Programs

In the US, seven states have enacted packaging EPR laws as of 2026: California (SB 54), Maine, Oregon, Washington, Minnesota, Connecticut, and Colorado. Each program requires producers to join a Producer Responsibility Organization (PRO) and pay eco-modulation fees that are reduced for certified compostable packaging. BPI listing is the standard evidence accepted by PROs to qualify for the compostable fee tier.

For Canadian distribution, provincial regulations in British Columbia, Quebec, and Ontario mirror the US pattern. If your product is sold in any of these jurisdictions, ASTM D6400 plus BPI listing is the practical entry ticket; EN 13432 alone will not satisfy the North American PROs.

One last detail that catches first-time exporters: EPR registration is separate from compostability certification. The two processes are run in parallel, with different application forms, fees, and renewal cycles. Your packaging can be EN 13432-certified and BPI-listed and still be non-compliant in California if you have not registered with a PRO and paid the applicable eco-modulation fee.

8. XIADE's Specifier Guide: Choosing EN 13432, ASTM D6400, or Dual-Cert

Three questions determine which certification path a cellulose film project needs. They take about ten minutes to answer and save the typical 9–14 month certification cycle from going down the wrong path.

1. Where is the product sold? EU only → EN 13432 (TÜV Austria or DIN CERTCO). North America only → ASTM D6400 (BPI). Both → dual certification run in parallel.
2. Is the end consumer a household or industrial user? Household → consider OK Compost HOME in addition to EN 13432 if home-compostable marketing is planned. Industrial foodservice or institutional composting → EN 13432 or ASTM D6400 alone is sufficient.
3. Is the film coated, laminated, or printed? Pure cellulose → standard test cycle, ~6–9 months. Coated or laminated → ASTM D6400's 1–10% additive testing adds time; confirm coating chemistry is itself biodegradable before starting.

For most XIADE customers in the medical device, food packaging, and aerospace subcontracting segments, the answer is dual certification. The cellulose film passes both standards without reformulation, the certifying bodies accept parallel testing, and the EU and US EPR registration cycles are independent of the lab testing window.

Frequently Asked Questions