Home Compostable vs Biodegradable: Certification Loopholes to Avoid

Home Compostable vs Biodegradable: Certification Loopholes to Avoid

You’re sourcing eco-friendly food packaging for your brand. The supplier shows you a certificate that says “biodegradable.” Looks legit, right? Not so fast. In our 15 years running a bagasse and PLA tableware factory, we’ve seen countless buyers get burned by vague claims. The difference between “home compostable” and “biodegradable” isn’t just semantics—it’s the difference between a product that breaks down in your backyard bin in 90 days and one that sits in a landfill for decades. Let’s cut through the greenwash.

What Do These Terms Actually Mean?

Biodegradable is a broad term. It means something can be broken down by microorganisms, but it says nothing about time, environment, or toxicity. A plastic bottle is technically biodegradable—it just takes 450 years. Home compostable, on the other hand, has a specific definition under standards like EN 13432 (industrial) or the newer home compost certifications like TÜV Austria’s “OK Compost HOME” and AS 5810 (Australian). These require disintegration into CO2, water, and biomass within 180 days at ambient temperatures (20-30°C). Industrial compostable materials, like PLA, need 58°C and high humidity—conditions you won’t find in a home pile.

Here’s the kicker: many “biodegradable” plastics are actually oxo-degradable—they fragment into microplastics. That’s not composting; it’s pollution. In our factory, we only use materials that pass the ASTM D6400 (US) or EN 13432 (EU) industrial standards, and we test for home compostability separately. If your supplier can’t show you a certificate with a specific standard number, walk away.

Why “Biodegradable” Is Often a Loophole

Let’s get contrarian: “biodegradable” is the most abused word in packaging. A 2020 study by the European Commission found that 42% of products labeled “biodegradable” didn’t meet any recognized standard. Why? Because there’s no universal law requiring certification. In the US, the FTC Green Guides allow “biodegradable” claims only if the product will completely break down within a reasonably short time after customary disposal. But “reasonable” is vague. So suppliers slap the word on anything from PLA-lined paper cups (which don’t break down at home) to kraft paper bowls with plastic film.

Tip: Always ask for the specific test method. For home compost, look for “OK Compost HOME” (TÜV Austria) or “DIN CERTCO Home Compostable.” For industrial, ASTM D6400 or EN 13432. If they say “biodegradable per ISO 14855,” that’s just a test for biodegradation rate—not a certification. Our own bagasse plates are certified home compostable under AS 5810, and we provide the lab report. If a supplier hesitates, it’s a red flag.

Key Certifications You Can Trust (and One to Avoid)

Here’s a quick breakdown of the major certifications and what they actually guarantee:

Avoid: “Biodegradable” without a standard. Also avoid “oxo-biodegradable”—that’s just plastic with additives that fragment. The EU has banned oxo-degradable plastics under Directive 2019/904. If your supplier pushes that, they’re selling you a liability.

Real-World Examples: What Happens in a Home Compost Bin?

We tested our own products. A 9-inch bagasse plate (no coating) breaks down in 60 days in a home pile, turning into crumbly organic matter. A PLA-coated paper cup? After 180 days, it’s still intact—the PLA layer doesn’t degrade at 25°C. That’s why many “compostable” paper cups are only industrial compostable. In our factory, we use a water-based coating on kraft paper that passes OK Compost HOME. It costs about 15% more than PLA coating, but it actually works.

Common misconception: “All plant-based plastics are home compostable.” Wrong. PLA is made from corn, but it needs industrial heat. Cornstarch blends (like Mater-Bi) can be home compostable if formulated correctly. Check the certificate, not the raw material name.

How to Vet Your Supplier’s Claims

When you’re sourcing, don’t just take their word. Here’s a checklist we give our own clients:

• Ask for the certificate number and verify it online (e.g., TÜV Austria’s database).
• Request a lab test report showing biodegradation >90% within 180 days for home compost.
• Check if the coating or adhesive is also certified—a bagasse plate with a non-compostable laminate fails.
• For PLA products, ask if they’re labeled “industrial compostable” only. If they claim home compost, demand proof.
• Beware of “green” logos that aren’t third-party—like a leaf icon with no standard number.

One more thing: price. A home compostable bagasse clamshell (8x8x3) runs about $0.25-0.35/pc at 10k MOQ. Industrial compostable PLA versions are $0.15-0.20. If a supplier offers “biodegradable” for $0.10, they’re likely cutting corners. You get what you pay for.

Regulatory Risks and Consumer Trust

In 2022, the FTC fined several companies for misleading “biodegradable” claims. The EU’s Green Claims Directive will soon require all environmental claims to be substantiated by third-party certification. If you’re exporting to Europe or California (where AB 1201 bans “compostable” claims without certification), you could face fines or product removal. Beyond legal risk, consumers are savvier. A 2023 survey by McKinsey found that 67% of consumers check labels for compostability claims. If your packaging says “biodegradable” but ends up as microplastics, your brand trust evaporates.

Our advice: Stick to certified home compostable materials for food packaging. Bagasse, kraft paper (with compostable coating), and cornstarch blends are proven. Avoid PLA unless you’re sure your customers have industrial composting access. And never, ever use the word “biodegradable” without a standard. It’s not worth the backlash.

FAQ: Common Questions About Compostable Certifications

Can I put home compostable packaging in my backyard bin?

Yes, if it’s certified home compostable (e.g., OK Compost HOME). It will break down within 180 days at ambient temperatures. But check the label—some products are only industrial compostable and won’t degrade in a home pile.

What’s the difference between ASTM D6400 and EN 13432?

Both are industrial compost standards. ASTM D6400 is US-focused, EN 13432 is EU. They require similar conditions (58°C, high humidity) and >90% biodegradation within 180 days (ASTM) or 90 days (EN). For home compost, look for separate certifications like AS 5810 or OK Compost HOME.

Is “biodegradable” the same as “compostable”?

No. Compostable is a subset of biodegradable with specific time and environment requirements. Biodegradable has no defined timeframe—a product can be called biodegradable even if it takes centuries. Always look for a compostable certification.