Are PLA Cold Cups Really Compostable? Understanding EN1

Are PLA Cold Cups Really Compostable?

For international packaging importers and food service chains, switching to PLA (Ácido poliláctico) cups is a major step toward sustainability. Sin embargo, introducing these products to markets like the European Union or North America comes with strict regulatory scrutiny. Customs officials and local environmental agencies frequently ask: Is this packaging genuinely compostable, or is it just another form of microplastic-leaving bioplastic?

To clear customs seamlessly and protect your brand from “greenwashing” penalties, you must understand the technical reality of PLA degradation and the international standards that govern it: EN 13432 y ASTM D6400.

The Science: “Biodegradable” vs. “Industrial Compostable”

One of the biggest misconceptions among B2B buyers is that a PLA cup will simply disappear if left in a landfill or the ocean. It will not.

PLA is derived from plant starches (like corn), haciéndolo de base biológica, but its chemical structure requires specific ambient conditions to break down entirely.

• Home Composting/Landfills: In standard soil or backyard compost piles, temperatures rarely reach the threshold required to break PLA’s polymer chains. In these environments, degradation can take years.
• Industrial Composting Facilities: This is where PLA functions as designed. These managed environments maintain a consistent temperature of 58°C to 60°C (136°F to 140°F), high relative humidity, and rich microbial activity. Under these precise parameters, PLA breaks down into water, $CO_2$, and nutrient-rich biomass, leaving absolutely zero toxic residues behind.

The Two Gold Standards of Composting

To prove to customs, supermercados, and consumers that your imported cups will fully degrade in an industrial system, your manufacturer must supply test reports matching two primary standards:

                  ┌────────────────────────────────────────┐
                  │      Industrial Compost Standards      │
                  └───────────────────┬────────────────────┘
                                      │
                   ┌──────────────────┴──────────────────┐
                   ▼                                     ▼
       ┌───────────────────────┐             ┌───────────────────────┐
       │   EN 13432 (Europe)   │             │   ASTM D6400 (USA)    │
       └───────────────────────┘             └───────────────────────┘

1. EN 13432 (European Standard)

This European harmonized standard sets the requirements for packaging recoverable through composting and biodegradation. For a PLA cup to pass EN 13432, it must undergo laboratory testing to prove four specific criteria:

• Biodegradation: At least 90% of the organic carbon must convert to $CO_2$ within 6 meses.
• Disintegration: After 12 semanas of composting, no more than 10% of the original dry weight of the cup may fail to pass through a 2milímetros sieve mesh.
• Ecotoxicity: The resulting compost is tested on plants (such as summer barley and cress). The plant growth rate must exceed 90% compared to control compost, ensuring no heavy metals or chemical residues harm the soil.
• Chemical Composition: Limits are set on heavy metals (such as Lead, Mercury, and Cadmium) and volatile solids allowed in the starting material.

2. ASTM D6400 (American Standard)

This is the equivalent standard issued by the American Society for Testing and Materials. It dictates the specifications for plastics designed to be composted in municipal and industrial facilities.

• Its parameters closely mirror EN 13432, requiring 90% conversion to carbon dioxide within 180 días, ensuring that the plastic degrades at a rate comparable to known compostable materials (like paper) and does not diminish the value or safety of the final compost.

Procurement Checklist: How to Verify Supplier Compliance

When sourcing bulk PLA cold cups from China, do not rely on a simple text print on the cup that says “100% Biodegradable.” You must request verifiable technical documentation from your supplier.

1. Look for Third-Party Certification Logos: Genuine compostable PLA products are certified by recognized third-party bodies. Ask your supplier for certificates from TÜV AUSTRIA (Ok compost industrial) for Europe, or the BPI (Biodegradable Products Institute) for North America.
2. Verify the Testing Body: Ensure the test report originates from accredited international testing labs such as SGS, TÜV, or DIN CERTCO.
3. Check Item Matching: Ensure the certificate explicitly covers the specific material grade and thickness of the cups and lids you are purchasing, as thicker plastic sections take longer to break down.

Compliance Assurance at YSTPACK

En YSTPACK, we manufacture our eco-friendly line using pure, high-grade PLA resins that fully comply with both EN 13432 y ASTM D6400 frameworks.

• Our PLA cold cups and matching flat/dome lids carry valid certifications, eliminating customs clearance risks at major global ports.
• We use zero traditional plastic additives, ensuring that your branded packaging completely converts to organic matter without generating microplastics.
• Every batch undergoes strict internal dimensional and structural testing, guaranteeing that our compostable cups maintain the exact rigidity and snap-fit lid tolerances of traditional PET alternatives.

Need a copy of our compliance certificates for your local environmental audit?

[Contact the YSTPACK compliance team today] to receive full SGS test reports and request factory-direct pricing for your custom-printed eco-packaging.