Home Compostable vs Industrial Compostable: What's the Real Difference?
Home compostable means a product breaks down in a standard backyard compost pile at ambient temperature, while industrial compostable means it requires the high heat (55-60 degrees C) and controlled conditions of a commercial composting facility. Understanding home compostable vs industrial compostable is the first step to choosing the right compostable bag or wrap for how you actually plan to dispose of it.
This distinction matters because a product certified for one environment will not necessarily break down in the other within a reasonable timeframe. A bag that says "compostable" on the package without specifying which certification it holds leaves you guessing, and guessing is exactly what leads to compostable products ending up in landfill instead of a compost pile where they can actually do what they're designed to do.
What Does "Compostable" Actually Mean?
Certified compostable means a product breaks down into carbon dioxide, water, and organic matter, leaving no toxic residue and no microplastics behind. It is not the same as "biodegradable," which is a broader, less regulated term that doesn't specify a timeframe, a required environment, or a residue standard. A material can be labeled biodegradable and still take decades to break down, or leave behind fragments. Certified compostable products, by contrast, must meet defined disintegration timeframes and pass toxicity testing under recognized standards.
One point applies to both home and industrial compostable products: composting only begins when the material is exposed to heat, moisture, and microbial activity. A compostable bag sitting in a kitchen drawer, a sealed trash bin, or a landfill is not composting, because those environments don't provide the active conditions the material needs to break down. Like all organic materials, compostable bags decompose more slowly in landfill conditions where oxygen and moisture are limited. Compostable bags are designed for active composting environments, not landfills.
How Do Home and Industrial Composting Actually Work?
The two systems differ in temperature, timeframe, and where the composting happens.
Home composting takes place in a backyard compost bin or pile at ambient outdoor temperature. There's no added heat source, no controlled humidity, and no industrial equipment, just organic waste, air, moisture, and naturally occurring microbes. Under the TUV OK Compost HOME standard, a certified product must achieve 90% disintegration within 180 days under these standard backyard conditions.
Industrial composting takes place at a commercial composting facility, where temperatures are maintained at 55-60 degrees C alongside controlled humidity and active microbial management. These elevated, consistent conditions break materials down faster than a backyard pile can. Under ASTM D6400 (the U.S. standard), certified products must reach 90% disintegration within 84 days. Under EN 13432 (the EU standard), the equivalent threshold is 90 days.
The practical takeaway: home composting works, but it takes roughly twice as long as industrial composting, because it relies on ambient heat rather than the sustained high temperatures a commercial facility can maintain. Neither system is "better," they're built for different infrastructure and different users.
What Certifications Prove a Product Is Actually Compostable?
Because "compostable" isn't a protected term everywhere, certifications are the only reliable way to verify a claim. Here are the ones that matter, and what each one confirms:
- BPI Certified (Biodegradable Products Institute) confirms compliance with ASTM D6400 for industrial composting in the U.S. BPI certification requires independent third-party laboratory testing, it is not a self-declared claim, and products must demonstrate compliance before certification is granted.
- TUV Austria OK Compost INDUSTRIAL confirms a product meets industrial composting requirements, generally aligned with EN 13432 in the EU.
- TUV Austria OK Compost HOME confirms a product has been tested and verified to break down in a home composting environment, meeting the 90% disintegration within 180 days benchmark at ambient temperature. This certification is what separates a genuinely home-compostable product from one that only works in an industrial facility.
- ASTM D6400 is the U.S. standard for compostability in municipal or industrial facilities.
- EN 13432 is the equivalent EU standard for industrial composting.
When evaluating any compostable product, including outside the GreeneWrap line, look for the specific certification name and logo, not just the word "compostable" on its own. A product labeled home compostable should reference TUV OK Compost HOME specifically. A product labeled industrially compostable should reference BPI or ASTM D6400. If a package uses the word "compostable" with no certification listed at all, that's a signal to look closer before assuming it will break down in your compost bin.
It's also worth noting that some compostable products on the market may contain PFAS, so certification alone doesn't guarantee a product is free of it, always check the specific claim rather than assuming it applies industry-wide.
How Do You Know Which One You Need?
The right choice depends entirely on where the material will end up after use, not on which certification sounds more rigorous.
Choose home compostable if you:
- Maintain a backyard compost bin or pile
- Compost food scraps, yard waste, or kitchen trash at ambient temperature
- Don't have access to a municipal green-bin or industrial composting program
Choose industrial compostable if you:
- Have access to a municipal curbside compost program or green bin that sends waste to a commercial facility
- Live in a city or region with an established industrial composting infrastructure
- Are managing waste at a business, job site, or facility that contracts with a commercial composting service
Products certified under both standards, such as those carrying both OK Compost HOME and OK Compost INDUSTRIAL certification, give you flexibility either way. This matters in practice because many households don't know in advance whether their waste will go to a backyard pile or a municipal facility, and dual certification removes the guesswork.
Municipal programs vary by city in what they accept, so it's worth checking with your local composting or waste management program directly before assuming a certified compostable bag is accepted curbside.
What Are Compostable Bags Made Of?
Certified compostable bags are typically made from plant-based materials such as PLA (polylactic acid, derived from fermented plant starch), PBAT (a biodegradable polyester often blended with PLA for flexibility and strength), and cornstarch-based resins. These materials are engineered to behave like plastic during use, holding shape, resisting tears, containing liquids, but to break down into carbon dioxide, water, and organic matter once exposed to the right composting conditions. This is different from conventional plastic, which is petroleum-based and does not break down into organic matter under any composting condition.
Does Size or Bag Type Change Which Certification You Need?
No. Certification is a property of the material itself, not the bag's size or intended use. A small 1-2 gallon kitchen scrap bag and a 90-95 gallon yard waste bag can both carry the same OK Compost HOME and OK Compost INDUSTRIAL certifications if they're made from the same certified compostable material. What changes with size is typically the use case: heavier-gauge bags in the 50 gallon and above range are commonly used for contractor cleanup, job-site debris, and large volumes of yard waste, while smaller, thinner bags are designed for kitchen scraps and everyday household trash. The composting standard a bag meets is independent of how large it is.
Practical Tips for Using Compostable Bags Correctly
- Match the bag to your composting system. Use home compostable bags for a backyard pile, and industrially compostable bags if your waste goes to a municipal or commercial facility.
- Don't leave wet waste sitting for long. Compostable bags are suitable for wet food scraps for short-term use, but moisture accelerates breakdown, so avoid leaving wet waste in the bag for more than 1-2 days.
- Store bags properly before use. Compostable bags are stable under normal indoor storage conditions in a cool, dry place, and should be used within 12 months of purchase to ensure they perform as intended.
- Watch for sharp objects. Broken glass, bones, or other sharp items can puncture any compostable bag, a limitation common to all compostable bags regardless of brand.
- Don't expect landfill breakdown. Biodegradation occurs significantly slower in landfill conditions due to limited oxygen and moisture, so compostable bags should be routed to an actual composting environment whenever possible.
How Can You Spot Greenwashing in Compostable Claims?
The single most reliable check is whether a specific, named certification appears on the package, BPI, TUV Austria OK Compost HOME or INDUSTRIAL, ASTM D6400, or EN 13432. Vague language like "eco-friendly," "green," or "plant-based" without a certification reference doesn't confirm compostability under any tested standard. Similarly, a product that only says "compostable" without specifying home or industrial leaves an important gap, since the two environments have different requirements and timeframes. When in doubt, look up the certification number or logo directly with the certifying body, since legitimate certifications are independently verifiable and require third-party lab testing rather than a manufacturer's self-declaration.
FAQ
Can industrial compostable bags be composted at home?
Not reliably. Industrial compostable bags are designed for the sustained high heat (55-60 degrees C) of a commercial facility, and a backyard pile typically won't reach or maintain that temperature. A bag certified only under ASTM D6400 or EN 13432, without OK Compost HOME certification, isn't verified to break down under home conditions within a reasonable timeframe.
Are GreeneWrap bags certified for both home and industrial composting?
Yes. GreeneWrap compostable trash bags and food storage bags are BPI certified, TUV Austria certified, OK Compost HOME certified, and OK Compost INDUSTRIAL certified, and meet both ASTM D6400 (USA) and EN 13432 (EU) standards, giving flexibility for either a backyard pile or a municipal composting program.
How long does it take for a compostable bag to break down?
Under industrial conditions, certified compostable bags reach 90% disintegration within 84 days (ASTM D6400) or 90 days (EN 13432). Under home composting conditions, certified bags reach 90% disintegration within 180 days at ambient temperature.
Is "biodegradable" the same as "compostable"?
No. Biodegradable is a general term with no required timeframe, environment, or residue standard, so a biodegradable product could take years to break down or leave fragments behind. Certified compostable products must meet specific disintegration timeframes and pass toxicity testing under standards like ASTM D6400, EN 13432, or OK Compost HOME.
Will a compostable bag break down if it ends up in the trash or landfill?
Compostable bags are designed for active composting environments, not landfills. Biodegradation occurs significantly slower in landfill conditions due to limited oxygen and moisture, so a compostable bag should be composted through a backyard pile or municipal program to break down as intended.