Degradable Packaging 3 Certification Standards: Compost / Biodegradable / Recyclable - Sort Out These 3 Before Sending for Testing

In April this year, a printer in Guangdong that makes export food containers received an order from a Dutch customer: 1 million pieces of bagasse food containers, requiring "Biodegradable" certification. The printer sent them for testing and obtained the ASTM D6400 report, but the customer said: "What we want is not D6400 (Compostable), we want EN 13432 OK Compost." The two standard numbers sound similar, but the test scenarios are completely different. The printer had to retest, delaying 2 months and nearly breaching the contract.

This is the most common pitfall when sending degradable packaging for testing: the printer assumes "Biodegradable = Compostable", but in practice the internationally accepted "Biodegradable / Compostable / Recyclable" are 3 independent certification systems, with completely different boundaries. The 3 categories are explained in detail below.

Category 1: Industrial Composting Certification - ASTM D6400 / EN 13432 / GB/T 19277

Industrial Composting certification is the one printers most commonly encounter out of the 3 categories. Its core requirement is: the material must biodegrade by 90% or more into carbon dioxide, water, and humus within 90-180 days under controlled industrial composting conditions (temperature 58+/-2C, humidity, mechanical agitation, specific microbial communities).

ASTM D6400 (USA)

Test items:

• Degradation rate >= 90% within 180 days
• Ecotoxicity (degradation products are non-toxic to plant growth)
• Heavy metal residue limits

Applicable objects: PLA, PHA, starch-based plastics and other bio-based plastics.

The most common pitfall for printers: ASTM D6400 is "Industrial Composting", not "Home Composting". The printer sends samples for testing and obtains the D6400 report, but the customer's actual scenario is household waste - home composting temperatures are only 25-40C, so materials that biodegrade at D6400's "industrial temperature" may not biodegrade for a full year under household conditions.

EN 13432 (EU)

Test items: similar to ASTM D6400, but more stringent. EN 13432 additionally requires:

• Disintegration test (>=90% of particles smaller than 2mm within 12 weeks)
• Ecotoxicity tests (on plants and aquatic organisms)
• Compost quality impact test

EN 13432 is the EU's "threshold"; obtaining EN 13432 certification allows use of the "OK Compost" mark (issued by TUV Austria).

GB/T 19277-2011 (China National Standard)

Test items are similar to EN 13432, but test conditions follow the national standard GB/T 19277. Some domestic brands (especially those making export-oriented degradable products) require both GB/T 19277 + EN 13432 dual reports.

HJ/T 209-2005 (China Industry Standard)

Issued by the Ministry of Ecology and Environment, applicable to degradable plastic packaging. More detailed than GB/T 19277 for plastic packaging scenarios.

Category 2: Biodegradable Plastic Certification - ASTM D7081 / OECD 301

Biodegradable Plastic certification and "Composting certification" are two independent systems. Its core requirement is: the material can be decomposed by microorganisms in natural environments (soil, freshwater, seawater) or under specific conditions.

ASTM D7081 (USA)

Applicable objects: Biodegradable plastics (mainly targeting photodegradable and biodegradable plastics). Test conditions:

• Degradation >=60% in activated sludge within 28 days
• Soil burial 180 days >=70% degradation

Note: ASTM D7081 tests "degradation in activated sludge/soil", not "composting conditions".

OECD 301 / ISO 17540 (International)

The OECD 301 series is the "intrinsic biodegradability" test standard issued by the OECD (Organisation for Economic Co-operation and Development). ISO 17540 is the corresponding version from the International Organization for Standardization.

Test items:

• >=60% mineralization in activated sludge within 28 days (CO2 release)
• 10-day window pass

The most common pitfall for printers: ASTM D7081 and OECD 301 are both "Biodegradable Plastic" certifications, but they are not interchangeable with "Composting certification". The printer submits an OECD 301 report, but the customer wants a D6400 composting report - the two standards differ, and separate testing is required.

Category 3: Recyclable Certification - GB/T 18455 / ISO 14021 / ASTM D5488 / EN 17130

"Recyclable" and "Biodegradable" / "Compostable" are completely different concepts. Recyclable packaging means the material can be reprocessed into new products. There are 4 common recyclable mark standards:

GB/T 18455-2010

Chinese national standard, specifying the graphics, symbols, and meanings of packaging recycling marks. The "triangle arrow" of the recycling mark is defined by GB/T 18455.

ISO 14021

International standard, specifying the specific requirements for "recyclable claims". If a printer prints the "Recyclable" mark on packaging, it must meet the claim requirements of ISO 14021.

ASTM D5488-14

US standard, specifying the terminology and symbol system for recycling marks.

EN 17130

EU standard, specifying the graphics and declaration requirements for packaging recycling marks.

The most common pitfall for printers: treating "Recyclable" as "Biodegradable". Recyclable materials (such as PET, HDPE) may take 100-1000 years to biodegrade in natural environments; Biodegradable materials (such as PLA) may contaminate the recycling stream in the recycling system, causing downgrading of PET recyclate. The two are not interchangeable.

Boundaries of the 3 Certifications: Understand at a Glance

4 Self-Check Items Before Sending for Testing

Self-Check 1: Which scenario does the customer require? Is the customer an "industrial composting facility", "home composting", "landfill", or "recycling stream"? Different scenarios correspond to different certifications. Sending the wrong test equals wasting money.

Self-Check 2: Validity period of the test report. Biodegradable/compostable certification reports are generally valid for 2-5 years, but become void after material formulation changes. The printer must keep the latest test report.

Self-Check 3: Mark usage rights. "OK Compost", "Seedling", and the "triangle arrow" are all copyrighted marks - they cannot be used without authorization, and using them constitutes infringement. The printer must obtain written authorization from the certification body before printing them on packaging.

Self-Check 4: Regulations in the customer's destination country. The USA uses ASTM, the EU uses EN, China uses GB/T, Switzerland uses OK Compost, and Japan uses GreenPla - the same product exported to different countries may require different certifications.

3 Pairs of Concepts Most Often Confused by Printers

Confusion 1: "Biodegradable" and "Compostable". Biodegradable covers a broader scope (including soil degradation and activated sludge degradation), while Compostable is only a subset of Biodegradable (under industrial composting conditions).

Confusion 2: "Industrial Composting" and "Home Composting". EN 13432 covers Industrial Composting, while EN 17427 covers Home Composting - the two have different conditions.

Confusion 3: "Recyclable" and "Biodegradable". Recyclable emphasizes "reprocessing", while Biodegradable emphasizes "decomposing and disappearing". PLA is both Biodegradable and non-Recyclable (it contaminates the mainstream PET recycling stream); PET is both Recyclable and non-Biodegradable (it does not decompose in soil for 100 years).

FAQ

Frequently asked questions have been consolidated in the FAQ section.

Further Reading

• Compostable vs Biodegradable vs Recyclable: 3 Marks - Don't Mix Them Up Again - Compliance Boundaries for Brands Launching in Europe and America
• Bagasse / PLA / Bamboo Fiber / Mycelium: How to Choose Among 4 Bio-Based Packaging Materials?
• Packaging Recycling Mark 4 Standard Execution Gaps: GB/T 18455 / ISO 14021 / ASTM D5488 / EN 17130