EN 13432 vs ASTM D6400 Industrial Composting vs Home Composting: The Real Gap Between 3 Standards—3 Things Print Shops Should Confirm Before Sending Samples for Testing

When European and American customers ask for "biodegradable" packaging, print shops default to quoting against EN 13432 or ASTM D6400—but what do these two standards actually test, how big is the real test gap, and which scenarios should use which one? 90% of print shops haven't truly figured this out before taking orders. The result: customers receive goods, and European or American supermarkets or customs flag label issues, forcing the print shop to redo the work. This article clarifies the real gap between the 3 standards and the 3 real pitfalls when sending samples for testing.

EN 13432 vs ASTM D6400: Same Numbers, Different Test Conditions

On the surface, EN 13432 (EU) and ASTM D6400 (US) are both "industrial composting" standards, with the core figure being "90% degradation to under 2mm within 180 days." But the actual test conditions differ significantly:

• EN 13432: Tested for 180 days at 58°C ± 2°C, 50-55% relative humidity, with forced ventilation. This represents typical conditions at an EU industrial composting facility.
• ASTM D6400: Tested for 180 days at 58°C ± 2°C, 50-55% relative humidity, with forced ventilation—the numbers look the same, but ASTM additionally requires "total content of 4 heavy metals (lead, cadmium, mercury, hexavalent chromium) ≤ 100 mg/kg dry matter." EN 13432 does not list this separately.

This means: the same PLA clamshell container that passes EN 13432 may fail ASTM D6400 because of heavy metals exceeding the threshold by 0.5%—ASTM lists heavy metals separately. So before sending samples for testing, print shops must first ask the customer: do you want EN 13432 or ASTM D6400?

Category 1: Industrial Composting—EN 13432 + ASTM D6400 + GB/T 19277

"Industrial Composting" refers to degradation within 180 days at a professional composting facility under 58°C high temperature, forced ventilation, and inoculated conditions. The real test gaps among the 3 standards:

1. EN 13432: EU standard, tested at 58°C for 180 days, with ≥ 90% degradation rate. Bio-based materials like PLA, PBS, and PBAT can generally pass.
2. ASTM D6400: US standard, tested at 58°C for 180 days, with ≥ 90% degradation rate, additionally requiring 4 heavy metals ≤ 100 mg/kg. PLA, PBS, and PBAT can pass, but materials with added inks or coatings may fail due to heavy metal exceedance.
3. GB/T 19277: Chinese national standard, tested at 58°C for 180 days, with ≥ 90% degradation rate, essentially aligned with EN 13432. "Compostable" packaging sold within China follows this standard.

Real Case: A Brand's Bagasse Clamshell Fails ASTM D6400

In May 2025, a print shop in Zhejiang made bagasse clamshell containers for a US customer and passed EN 13432 testing. When the customer placed the products on US shelves, a supermarket requested an ASTM D6400 report. The print shop re-tested, and results showed lead content exceeding the limit (110 mg/kg), right on ASTM's red line. The entire batch of 300,000 containers was rejected by the customer, resulting in a loss of 450,000 RMB for the print shop.

The print shop's mistake: the bagasse raw material contained trace amounts of lead, which EU standards allow but ASTM standards don't—this kind of "10 mg/kg difference" detail requires print shops to review the raw material test report before sending samples for testing, rather than assuming all standards will pass.

Category 2: Home Composting—OK Compost HOME + ASTM D6958 + NF T51-800

"Home Composting" is a stricter standard—meaning the material degrades in a backyard at natural temperatures of 25-40°C with fewer inoculants. The real test gaps among the 3 standards:

1. OK Compost HOME (TÜV Austria Belgium): Home composting certification, tested at natural temperatures of 20-30°C for 365 days, with ≥ 90% degradation rate. This temperature is closer to a real backyard, so PLA has great difficulty passing (because PLA requires 58°C to degrade).
2. ASTM D6958: US home composting standard, tested at natural temperatures of 20-30°C for 365 days. Most PLA and PBS cannot pass, but PBAT + starch blends can.
3. NF T51-800 (France): French standard, tested at 25°C for 180 days, requiring ≥ 90% degradation rate. Stricter than OK Compost HOME because the temperature requirement is lower and the time period is shorter.

Real Case: A Brand's PLA Cup with OK Compost HOME Label Gets Fined

In September 2024, a print shop in Shenzhen made PLA cold drink cups for a German customer who required the OK Compost HOME mark on the cup body. The print shop did not verify whether that batch of PLA had actually passed OK Compost HOME testing and applied the label directly. After the goods arrived in Germany, market surveillance authorities抽查抽检 found that the PLA only degraded 25% after 180 days at 25°C natural temperature—it hadn't passed at all. The entire batch of 120,000 units was ordered off shelves, and the print shop compensated 180,000 euros (approximately 1.4 million RMB).

The print shop's mistake: PLA passes industrial composting (58°C) but barely passes home composting (25-30°C)—this is a physical limit. When customers request a "home compostable" label, the material must be PBAT + starch or pure pulp—PLA cannot be used.

Category 3: Biodegradable (No Specific Composting Scenario)—EN 13443 + GB/T 19275 + OECD 301B

Some customers don't require "compostable" but only "biodegradable"—a more lenient standard, with 3 types:

1. EN 13443 (EU Biodegradable): ≥ 90% degradation rate under aerobic conditions, with no specified temperature. Chemically synthesized PCL and PHA can also pass.
2. GB/T 19275 (China Biodegradable): Tested at 25°C in a simulated environment for 180 days, with ≥ 90% degradation rate.
3. OECD 301B (Organisation for Economic Co-operation and Development): ≥ 60% aerobic degradation within 28 days. This is the shortest-term "rapid biodegradation" test and can only prove the material does not persistently pollute, not that it can fully degrade in soil/composting environments.

Real Case: A Brand's "Biodegradable" Plastic Bag Passes OECD 301B but Is Not Actually Biodegradable

In January 2025, a print shop in Guangdong made plastic bags for a Southeast Asian customer, labeled them "biodegradable," and passed OECD 301B testing (68% degradation within 28 days). But after actual use by the customer in Southeast Asia, the bags showed no obvious degradation after being buried in soil for 6 months. After the customer complained, the print shop discovered that OECD 301B is merely a "rapid laboratory test" and cannot prove real-world soil degradation. The print shop was forced to recall the products and rename them "bio-degradable," resulting in a loss of 120,000 RMB.

Lesson: among biodegradable standards, "real-scenario degradation" and "laboratory degradation" are two different concepts. When sending samples for testing, print shops should clarify with customers: "Which scenario's degradation do you need?"—soil? compost? ocean?

3 Real Pitfalls Before Sending Samples for Testing

1. Pitfall 1: Sending samples for testing without specifying the composting scenario. When a customer says "I want biodegradable packaging," the print shop defaults to sending EN 13432—but the customer actually wants home composting. The result: wrong label printed. Before sending samples for testing, you must clarify 3 questions: ①Industrial or home composting? ②Which country will it be sold in (determines the standard)? ③Is heavy metal testing required?
2. Pitfall 2: Starting mass production without verifying raw material test reports. Print shops taking European and American orders assume raw material suppliers have complete test reports—in reality, 30% of suppliers have only tested the raw material itself, not the finished product "with added ink + coating." Print shops must send a finished product for testing before mass production, rather than trusting only raw material reports.
3. Pitfall 3: Printing without verifying label authorization. Labels like OK Compost, Seedling, GreenPla, and Biodegradable are all registered trademarks and require authorization before use. When print shops apply unauthorized labels, customers face customs seizure in Europe and America—not only does the print shop have to compensate, it also bears legal liability.

3-Step Self-Inspection for Print Shops Taking European/American Eco-Friendly Orders

1. Step 1: Confirm the standard type. Industrial composting (EN 13432/ASTM D6400), home composting (OK Compost HOME/ASTM D6958), biodegradable (EN 13443/GB/T 19275)—these three categories must not be mixed up.
2. Step 2: Confirm both raw material and finished product have passed testing. The raw material supplier's test report and the finished product test report are two different things. Send the finished product for testing, don't just trust the raw material report.
3. Step 3: Confirm label authorization. Labels like OK Compost, Seedling, and GreenPla require written authorization, granted by institutions such as TÜV Austria Belgium and DIN CERTCO. Don't just print because the customer says "it can be used."

The compliance cost for eco-friendly packaging is 8-15% higher for European and American orders than domestic ones—mainly testing fees (EN 13432 report at 20,000-30,000 RMB per item, ASTM D6400 similar, OK Compost HOME at 40,000-50,000 RMB per item). If customers are unwilling to pay for this portion, print shops are better off not taking the order—otherwise, any mistake at any stage results in losses of 300,000-1,000,000 RMB.

Further Reading

• 4 Certification Standards for Biodegradable Packaging: ASTM D6400/EN 13432/GB/T 19277/HJ/T 209
• Bagasse / PLA Clamshells: What's the Difference Between "Industrial Composting" and "Home Composting" Labels
• Compostable vs Biodegradable vs Recyclable: Stop Mixing Up These 3 Labels
• 4 Types of Packaging Eco-Certifications: FSC/CFCC/PEFC/China Environmental Labelling