If your packaging is labeled “compostable” in the U.S., regulators and retailers increasingly expect proof, not just a marketing claim. ASTM D6400 is the technical standard behind that proof, and third-party certification (most commonly through the Biodegradable Products Institute, or BPI) is how you demonstrate compliance to customers, brand partners, and state legislatures that now restrict unverified compostability claims.
This guide walks through what ASTM D6400 actually requires, how the certification process works from lab testing to logo approval, realistic costs and timelines, and the mistakes that most often delay approval.
Quick Answer
ASTM D6400 is a specification (not itself a certification) that sets pass/fail thresholds for a plastic or packaging item to be labeled compostable in a municipal or industrial composting facility. To make a certified compostable claim, you send samples to an accredited lab for disintegration, biodegradation, and ecotoxicity testing, then submit the results to a certifier such as BPI for technical review and logo licensing. Budget for a multi-month, multi-thousand-dollar process — testing alone can take 6-12 months.
What ASTM D6400 Actually Tests
ASTM D6400 evaluates three separate properties, and a product must pass all three to qualify. Disintegration measures physical breakdown: after 12 weeks in a controlled composting test, no more than 10% of the original dry weight can remain on a 2.0 mm sieve. Biodegradation measures whether microorganisms actually consume the material as food: the standard requires roughly 90% conversion to carbon dioxide within 180 days, tested against a positive control (typically cellulose) using a respirometry method such as ASTM D5338. Ecotoxicity/plant growth testing confirms the resulting compost isn’t harmful — regulated heavy metals must stay under 50% of the limits set for composts or sludges in the country of sale, and germination rate and plant biomass in finished compost must reach at least 90% of a control batch.
The current standard in force is ASTM D6400 (periodically revised by ASTM International, most recently updated in 2026), so always confirm you’re testing against the active edition rather than an older superseded version — your lab or certifier can confirm which edition applies.
The Certification Process, Step by Step
1. Confirm scope and feedstock fit. Certifiers like BPI require that your product realistically belongs with food scraps or yard trimmings in a composting stream — items unlikely to end up there (or that could contaminate compost) may be ineligible regardless of test results.
2. Submit an application with full packaging artwork and formulation documentation. This is also when fluorinated-chemical (PFAS) compliance is checked — BPI, for example, requires no intentionally added PFAS and total organic fluorine under 100 ppm.
3. Run preliminary lab tests. Metals content, ash, FTIR resin identification, and thickness/basis weight testing are relatively fast (often under a month) and screen out obvious disqualifiers before you invest in the long biological tests.
4. Run disintegration and biodegradation testing at an approved lab. This is the long pole: disintegration testing typically runs a minimum of about 3 months for commercial composting conditions (longer for home-compostable claims), and biodegradation testing typically runs a minimum of about 6 months (roughly double for home compostability).
5. Submit results for technical review. The certifier’s technical team reviews lab reports, formulation data, and artwork together — this review generally takes a few weeks once every required test is in hand.
6. Receive certification and license the mark. Once approved, you’re added to the certifier’s public database and licensed to display their certification mark, which typically must be renewed on a recurring cycle (BPI recertification runs on roughly a three-year cycle) alongside ongoing annual licensing and periodic batch checks.
Costs and Timeline to Expect
Certification fees are separate from lab testing fees, and both add up. As a reference point, BPI’s application fee is $1,500 for a commercial-only certification or $3,000 if you also want home-compostable certification, with recertification roughly $1,000–$2,000 every three years plus annual licensing and a modification fee (around $500) if you change artwork or formulation later. Lab testing costs vary by facility and are billed separately from certification fees, so get quotes directly from an accredited lab before budgeting.
On timeline, treat 12 months as a realistic planning horizon end-to-end, especially if biodegradation and home-compostable testing are both required. Companies that start testing early — well before a launch date or a retailer’s compliance deadline — avoid the most common bottleneck, which is lab queue time, not the review itself.
Tips / Common Mistakes
Don’t test an old formulation. Any material change — resin blend, ink, adhesive, coating — can affect disintegration and biodegradation results, so lock your final formulation before submitting samples; a late tweak can mean restarting months of testing.
Don’t assume ‘ASTM D6400 compliant’ and ‘certified’ are the same claim. Passing the standard’s technical thresholds is not the same as holding a licensed certification mark — many state compostability labeling laws require the latter, not just internal test data.
Watch for PFAS. Fluorine-based grease-resistant coatings are a common reason otherwise-compostable packaging fails certifier eligibility screens, independent of the ASTM D6400 lab results themselves.
Check which composting environment you’re certifying for. Commercial/industrial composting and home composting have different, non-interchangeable pass criteria and timelines — don’t market a commercially-certified product as home-compostable.
Explore more: More packaging compliance guides.
ASTM D6400 certification FAQs
Is ASTM D6400 itself a certification?
No. ASTM D6400 is a technical specification defining pass/fail test thresholds. A certification (such as BPI Certified) is the third-party program that verifies a specific product actually meets those thresholds and licenses a mark you can print on packaging.
How long does ASTM D6400 certification take?
Plan for roughly 6-12 months end-to-end. Preliminary tests (metals, FTIR) take under a month, but the required biodegradation testing alone typically needs a minimum of about 6 months, plus several weeks for technical review afterward.
How much does compostable packaging certification cost?
Certifier application fees commonly run in the low thousands of dollars (for example, BPI charges $1,500 for commercial-only certification), separate from lab testing fees, which vary by facility and should be quoted directly.
Does ASTM D6400 certification mean a product is home compostable?
No. ASTM D6400 and standard commercial certification cover industrial/municipal composting conditions. Home compostability requires separate, longer testing and a distinct certification, since home compost piles run cooler and slower than industrial facilities.
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Photo: SuSanA Secretariat / CC BY 2.0, via Wikimedia Commons.