We all create waste every day, but not all waste is equal. Some materials stay in landfills for centuries, while others break down naturally and return to the earth. That’s the big idea behind biodegradable materials.
Last Updated on December 16, 2025 by Gentle Packing Team
If you’re looking for sustainable ways to create products, especially reusable bags, choosing biodegradable materials is one of the smartest decisions you can make—for the planet and your brand. Let’s take a closer look at what makes a material biodegradable, which ones break down easily, and how you can use them in your packaging and products.
What Are Biodegradable Materials?
Biodegradable materials are substances that can naturally break down into non-toxic components when exposed to microorganisms, moisture, and oxygen. These materials decompose without harming the environment, usually turning into water, carbon dioxide, and biomass.
Biodegradable materials are made from organic matter like plants, animals, or natural fibers. You see them in things like paper bags, cotton t-shirts, compostable mailers, and even some food containers. Unlike synthetic plastics, which can take hundreds of years to disappear, biodegradable materials vanish in a much shorter time—sometimes in just a few weeks. This is why they’re becoming a top choice for eco-conscious brands and businesses.
When a material is biodegradable, that doesn’t just mean it disappears. It means it returns to nature in a safe and useful way. However, not all biodegradable materials are created equal. Some break down quickly. Others need special conditions. And some labeled “biodegradable” might not be so harmless after all.
Let’s break down the types that actually decompose easily—and which ones work best for your business.
How Does Biodegradation Actually Work?
When a material is biodegradable, that doesn’t just mean it disappears. It means it returns to nature in a safe and useful way.
The process happens thanks to the work of microorganisms—think bacteria, fungi, and other tiny critters found in soil, water, and compost heaps. As they break down the material, its structure changes, not just on the surface but at a chemical level. Over time, the core elements that make up the material—like hydrogen, carbon, and oxygen—are released back into the environment as water, carbon dioxide, and organic matter.
This natural recycling loop is what sets biodegradable materials apart from their synthetic cousins. But it’s worth noting that not all biodegradable materials are created equal. Some break down quickly. Others need special conditions. And some labeled “biodegradable” might not be so harmless after all.
Let’s break down the types that actually decompose easily—and which ones work best for your business.
Understanding this process helps you make better choices for your products and packaging—and for the planet.
Biodegradable vs. Oxodegradable: What’s the Difference?
You might have come across both “biodegradable” and “oxodegradable” labels while shopping for eco-friendly products. While they sound similar, there’s a crucial difference in how these materials break down—and what they leave behind.
Biodegradable materials break down naturally with the help of microorganisms like bacteria and fungi. Over time, they turn into harmless substances such as water, carbon dioxide, and organic matter. This natural process means they don’t pollute the environment with residue or unwanted byproducts.
Oxodegradable materials, on the other hand, degrade through exposure to oxygen and sunlight. Instead of fully turning into elements nature can easily absorb, oxodegradable materials simply fragment into smaller plastic pieces. These microplastics can persist in the environment for years, contributing to soil and water pollution—a bit like chopping a plastic straw into invisible confetti rather than making it vanish entirely.
So, if your goal is true sustainability, it’s important to understand that not all “degradable” materials are equal. Biodegradable options are genuinely safe for the planet, while oxodegradables can cause more harm than good by increasing the microplastic problem.
Let’s break down the types that actually decompose easily—and which ones work best for your business.
Biodegradable vs. Compostable: What’s the Real Difference?
At this point, you might be wondering: aren’t “biodegradable” and “compostable” just different words for the same thing? Not quite. While they sound interchangeable, some key distinctions matter—especially when you’re thinking about packaging, bags, or any product that’s meant to break down.
Biodegradable materials are a broad category. They’re designed to break down naturally, thanks to microorganisms in the right setting. That could mean a backyard pile, a landfill, or even just left out in nature. However, “biodegradable” doesn’t promise a specific timeframe or leave behind something useful. Some so-called biodegradable plastics need years (or even special conditions) to disappear, and might still leave microplastics behind.
Compostable materials, on the other hand, are a little stricter. To be labeled compostable, a product needs to fully break down within a specific time frame (usually less than six months) and turn into nutrient-rich compost, without leaving toxins or microplastics.
International standards, like EN 13432, set the bar for what counts as compostable. That’s why you’ll find trusted certifications, such as “OK Compost Home” and “OK Compost Industrial”. These stamps tell you whether the material can fully compost in a simple home setup (like a backyard bin), or if it needs the higher temperatures and managed conditions of an industrial composting facility.
So, here’s the bottom line:
- All compostable materials are biodegradable, but not all biodegradable materials are compostable.
- If you want your products to not just break down, but also help nourish the soil, look for compostable materials with a certification badge—either for home or industrial composting.
This distinction can make all the difference for your eco-friendly goals and for customers looking for cleaner, greener options.
What Materials Are Easily Biodegradable?
Some materials naturally break down faster than others. Easily biodegradable materials include cotton, bamboo, hemp, jute, paper, cardboard, wood, cork, silk, wool, and even feathers. Natural organic waste, such as food scraps or leaves, also breaks down quickly and safely in composting environments.
The Role of Cellulose in Easy Biodegradation
One of the biggest reasons these materials decompose so efficiently is their high cellulose content. Cellulose, the main building block of plant cell walls, is found in everything from cotton and paper to some types of biodegradable plastics. Because cellulose is naturally derived and readily digested by microorganisms, it breaks down swiftly in composting environments—leaving behind no toxins.
You’ll spot cellulose-based materials in eco-friendly packaging, compostable sponges and wipes, filters, and even disposable cleaning cloths. These products are designed to return safely to the earth, making them a reliable choice for reducing synthetic waste in everyday life.
So why do these materials degrade more easily than other biodegradable options? It comes down to how simple and natural their structure is. These materials come straight from nature, with minimal processing. Most of them are made of cellulose (in plants) or proteins (in animal-based fibers), which microorganisms in soil or compost can digest with very little effort. The fewer chemical treatments and synthetic additives involved, the easier it is for bacteria and fungi to break them down.
On the other hand, some materials—even if labeled biodegradable—go through heavy processing or include blended compounds. For example, certain bioplastics may require industrial composting conditions, high heat, or specific microbes to start breaking down. That makes them technically biodegradable, but not exactly easy to deal with.
Take plant starch-based bioplastics, for instance. You might come across compostable resealable bags or cling wraps made from these materials, which look and feel just like regular plastic. The catch? While they’re designed to break down faster than traditional plastics, they typically need to be sent to commercial composting facilities rather than your backyard compost pile. In the right environment, they can decompose within weeks instead of decades—but if tossed in the regular trash or a home compost, they may linger much longer than you’d expect.
Bottom line: Always check what kind of composting setup a material needs before assuming it’ll vanish on its own. Not all “biodegradable” options are created equally simple—or equally eco-friendly—to dispose of. If you’re looking for materials that decompose naturally, without needing special handling, the ones listed above give you the cleanest, quickest breakdown—and a much smaller footprint.
Cotton
Cotton is one of the most widely used biodegradable materials. It’s soft, and strong, and decomposes in as little as a few months. It’s also compostable if it’s untreated and undyed.
Cotton comes from the cotton plant, making it 100% natural. You’ll often see it used in reusable shopping bags, t-shirts, and home textiles. If you run a brand that wants to offer high-quality, sustainable products, cotton is a reliable choice.
Wood & Cork
Wood and cork are biodegradable when untreated and not varnished. They come from renewable resources and decompose in months or years, depending on thickness and the environment.
You’ll see them used in specialty packaging, tags, closures, and eco-luxury products. For brands that want a more natural, upscale feel, these materials can add both function and style.
Hemp & Jute
Hemp and jute are both plant-based fibers with a long history in textile and packaging industries. Jute bags are especially popular in wholesale and grocery markets.
Hemp is incredibly strong and decomposes faster than cotton. Jute is coarse but highly breathable and biodegradable. Both are excellent for businesses that need bulk, natural-looking packaging with a short environmental footprint.
Jute, often called the “golden fiber” for its warm hue and versatility, is a staple in everything from totes and twine to rugs and decorative accents. This humble material is not only stylish and durable, but also one of the easiest fibers to break down when composted. As a plastic alternative, jute offers a chic, earthy look in shopping bags or home décor—and you can feel good knowing it won’t linger in a landfill for decades. Both hemp and jute are truly soil-friendly options, perfect for brands and individuals wanting a blend of utility, sustainability, and style.
Bamboo
Bamboo is one of the fastest-growing plants in the world. It doesn’t need pesticides or much water, which makes it extremely eco-friendly. Bamboo fabric and paper products are not only biodegradable—they’re also antibacterial and durable.
You’ll find bamboo used in everything from paper straws to reusable bags. When it comes to biodegradable options that also feel premium, bamboo is hard to beat.
Coconut Coir
Coconut coir is the fibrous material found between the hard shell and the outer husk of coconuts. Thanks to its toughness and natural biodegradability, coir has become a favorite in eco-conscious packaging and everyday products.
You’ll spot coconut coir in things like scrub brushes, doormats, garden liners, compostable sponges, and even as a growing medium for seedlings. Once these items have served their purpose, you can toss them straight into the compost. Not only does coir break down efficiently, but it also enriches the soil as it decomposes—making it a practical and earth-friendly choice for both businesses and home gardeners.
Paper & Cardboard
Paper and cardboard are among the most common biodegradable materials. When uncoated and free of synthetic inks or plastic films, they break down quickly in soil or compost.
Not all paper is created equal, though. The uncoated kind—free from gloss, lamination, or plastic films and made from recycled fibers—decomposes the fastest and safest. Everyday items like egg cartons, paper packaging, and even seed-embedded greeting cards are great examples of how simple swaps can make a big difference in your waste reduction goals.
They’re ideal for packaging, especially when you want a clean, minimal, and recyclable look. At Gentle Packing, we offer washable paper bags that combine the biodegradability of paper with the durability of fabric—a great option if you want a product that looks and feels premium but still breaks down naturally.
Silk
Silk is a protein fiber made by silkworms. It decomposes in just months under the right conditions. Despite its delicate feel, silk is durable, luxurious, and fully biodegradable.
Brands using silk in product linings, custom silk bags, or specialty pouches can proudly say their material won’t linger in landfills.
Wool
Wool, like silk, is protein-based. It’s often used in textiles, but it’s also great in insulation or padding in packaging. It breaks down naturally, especially when cut into small pieces and added to compost.
Wool takes longer to decompose than cotton, but it leaves behind nutrients that enrich soil.
Organic & Agricultural Waste
Organic waste like fruit peels, leaves, coffee grounds, and corn husks is highly biodegradable and often used in industrial composting. Some companies, such as Biofase and Ecovative, turn avocado pits or mushroom mycelium into innovative biodegradable packaging—reducing waste at both the production and consumer levels.
Mushroom-Based Packaging
This might sound like science fiction, but it’s real—mushroom roots, or mycelium, are being used to grow packaging materials. These soft, cushiony forms work just like foam but break down completely within a month. They’re safe to compost and don’t leach anything toxic into the environment. You’ll start to see mushroom packaging popping up more and more in online orders, especially as brands look for alternatives to polystyrene and other plastics.
These advancements show how agricultural by-products and even fungi can be part of a smarter, low-waste packaging solution.
Animal-based materials like eggshells, manure, and feathers also break down easily. In some industries, they’re used to make fertilizers, biodegradable insulation, or natural fiber blends.
Feathers decompose quickly and are made of keratin, the same protein found in human hair. They are used in biodegradable insulation and filler material. If you’re in a niche industry that uses feathers or similar animal by-products, it’s good to know they can still be part of a low-waste solution.
These materials highlight how waste from food or farming can be transformed into something useful—and fully biodegradable.
Biodegradable Materials in Packaging
Packaging is one of the largest sources of waste in the world. Biodegradable packaging isn’t just good for the planet—it’s practical, versatile, and increasingly in demand. Here are some of the most common materials used to create biodegradable packaging across different industries.
Kraft Paper: Kraft paper comes from wood pulp. It handles wear and tear well and breaks down quickly in nature. You can use it for shopping bags, wrapping paper, or mailers when you want a clean, recyclable alternative to plastic.
Washable Paper: This innovative material is made from natural cellulose and mimics leather in texture. Washable paper bags are tear-resistant, reusable, and biodegradable—great for stylish packaging that also lasts.
Jute Fabric: Jute is a coarse plant fiber used for sturdy tote bags and grocery sacks. It’s strong, breathable, and decomposes naturally over time, making it perfect for everyday reusable bags.
Bamboo Pulp: Bamboo pulp is molded into trays, inserts, or box structures. It’s especially useful in product packaging for electronics, cosmetics, and gift items, offering a sleek but compostable solution.
Cotton & Hemp: These natural fibers are soft, strong, and break down within months. Cotton is common in drawstring pouches and canvas totes, while hemp provides a coarser texture and higher strength for bulk packaging.
Silk: Silk is a biodegradable protein fiber, typically used in luxury pouches, product wraps, or high-end gift packaging. It adds elegance while staying eco-friendly.
What Is the EN 13432 Standard for Compostable Materials?
If you’ve ever seen packaging labeled as “compostable” in Europe, it’s likely measured against the EN 13432 standard. This European certification sets clear criteria: for a material to earn the “compostable” badge, at least 90% of its total mass must break down into carbon dioxide within six months in an industrial composting setting.
In other words, compostable products—like certain bioplastics or plant-based packaging—must decompose efficiently and almost entirely within a standard compost environment. This ensures they won’t leave harmful residue behind and truly return to nature as intended.
With this standard in mind, you can be confident that compostable packaging choices genuinely support a lower-impact, circular economy.
Whether you’re packaging fashion accessories, natural foods, or promotional gifts, these materials offer eco-friendly solutions without compromising style or function. At Gentle Packing, we specialize in helping brands create custom biodegradable packaging that aligns with their values and elevates their products.
How Long Does Biodegradation Take?
The question of “How long will this material break down?” doesn’t have a one-size-fits-all answer. Just like a compost pile in Vancouver will work differently than one in the Arizona desert, the time it takes for biodegradable materials to decompose depends on a whole mix of factors.
Generally, the breakdown window looks like this:
- Organic waste: Think food scraps or yard trimmings—these can disappear in a home compost heap within a few weeks to a few months.
- Plant-based packaging: Materials like kraft paper or jute bags often degrade within months under the right conditions.
- Thicker textiles or denser items: Such as bamboo trays or cotton totes, may take anywhere from several months to over a year.
- Conventional plastics: Even “biodegradable” blends of plastic can take years—or decades—especially if they’re not disposed of in the proper setting.
The Environment Matters
Temperature, moisture, oxygen, and the microscopic workforce of bacteria and fungi all influence the pace. Hot, damp, microbe-packed environments (like industrial composting facilities) speed things up, while landfill conditions can slow everything to a crawl.
No two pieces of packaging are identical, and—just to complicate things—there’s no strict official definition or time limit for the word “biodegradable.” Depending on who you ask, and where a product ends up, “biodegradable” might mean anywhere from a few weeks to several years.
This is why it pays to look at both the material and the disposal method when considering environmental impact.
Certifications for Biodegradation and Composting
Not all biodegradable materials break down under the same conditions—and that’s where third-party certifications come in. To help businesses and consumers understand where and how their materials will decompose, organizations like TÜV Austria provide clear labeling systems.
These certifications let you know if a material can biodegrade or compost in the following environments:
- Marine: “OK Biodegradable Marine” indicates a product will break down safely in ocean or sea conditions, helping tackle marine pollution.
- Soil: “OK Biodegradable Soil” means the item will decompose completely in the ground—ideal for agricultural films or garden products.
- Fresh Water: “OK Biodegradable Water” assures the material will degrade in rivers or lakes, preventing long-term pollution.
For composting, there are two main designations:
- Home Compostable: “OK Compost Home” certifies that materials break down in backyard compost bins, without the need for industrial facilities.
- Industrial Compostable: “OK Compost Industrial” signifies that the product requires higher temperatures and controlled environments, like those found in commercial composting plants, for complete breakdown.
These labels take the guesswork out of sustainability claims, ensuring you—and your customers—can be confident about the eco-friendly credentials of your packaging or products.
How to Tell if a Material Is Compostable?
If you’re wondering how to spot truly compostable products, look for the “OK Compost” stamp. This label isn’t just a feel-good sticker—it actually indicates which composting environment the material is suited for:
- OK Compost Home: Suitable for use in a home composter, where breakdown happens at lower, backyard-level temperatures and less controlled conditions.
- OK Compost Industrial: Requires the higher heat and specific conditions found in commercial composting facilities. Materials with this label won’t fully compost in a backyard pile.
Understanding which certification a product carries helps you determine the right disposal method and ensures that composting actually works as intended—whether in your own garden or at a community plant. This way, you can match your packaging choices to real-world composting capabilities and avoid wishful recycling.
Factors That Affect Biodegradation Speed
Biodegradation doesn’t happen at the same rate for every material. Several factors affect how fast something breaks down.
- Moisture: Water helps activate microbial activity.
- Oxygen: Aerobic conditions speed up decomposition.
- Microorganisms: Bacteria and fungi are essential for breaking down natural material.
- Temperature: Warm environments break down materials faster.
- Material form: Thin, shredded, or soft items break down more quickly than thick or dense ones.
- Surface treatments: Coatings, dyes, or synthetic blends can slow down or block decomposition.
When you choose biodegradable packaging or textiles, it’s important to think about not just the material—but also how it’s processed and where it will end up.
Advantages of Using Biodegradable Materials
Using biodegradable materials isn’t just about feeling good—it actually benefits your business.
- Lower disposal costs: These materials often qualify for composting or green waste programs.
- Positive brand image: You show your commitment to sustainability with every product.
- Product storytelling: You can highlight eco-friendly choices in your marketing.
- Customer satisfaction: Eco-conscious customers feel better about their purchase.
Switching to these materials doesn’t mean giving up convenience or comfort. It comes down to making intentional choices—ones that help shrink your footprint without stretching your budget. Biodegradable options are practical, effective, and increasingly available across a variety of applications, from packaging to textiles.
But the advantages go even deeper. Biodegradable materials are designed to break down efficiently—often within a matter of months, rather than decades or centuries like conventional plastics. As they decompose, they don’t leave behind harmful residues or microplastics, meaning they don’t generate lingering waste in the environment. This not only helps keep landfills and oceans cleaner, but it actively reduces the burden of poor waste management—a major issue with traditional plastics.
The benefits aren’t just at the end of life, either. The production process for most biodegradable materials typically generates less pollution than the manufacturing of conventional plastics, further reducing your environmental footprint. By choosing these materials, you’re helping make a more sustainable, less wasteful lifestyle accessible to your customers.
If you’re selling reusable bags, switching to biodegradable options sets you apart. It shows you’re not only offering value—you’re offering values.
Practical Uses of Biodegradable Materials
Biodegradable materials are everywhere. Here’s how they’re used in everyday products—and how you can include them in your line.
- Shopping Bags: Cotton, jute, hemp, and washable paper are all popular options for reusable shopping bags. They’re strong, stylish, and safe for the environment. Hemp-based bags, for example, are sturdy alternatives to synthetics, and once you’re done with them, you can toss them into the compost or garden—they break down fast and leave nothing harmful behind.
- Food Packaging: PLA films, compostable trays, and molded pulp from bamboo or sugarcane work well for food storage. They’re safe, hygienic, and break down easily. Mushroom packaging is also showing up in more e-commerce shipments; it’s fully compostable and disappears within weeks in the right conditions.
- Clothing: Natural fibers like cotton, hemp, silk, and wool are staples in biodegradable fashion. Brands that care about slow fashion and low-waste use these fabrics. Use them for dishcloths, wardrobe basics, or even reusable gift wrap—once worn out, they go right into your compost, nourishing the soil as they decompose.
- Shipping & E-commerce: Compostable mailers, paper-based void fillers, mailer boxes, and tape made of starch glue reduce plastic use in packaging and shipping. Paper-based options, like packing paper and egg cartons, are easy swaps that make a big difference in waste reduction.
- Personal Care Products: Biodegradable wipes, cotton swabs, bamboo toothbrushes, and shampoo bars are changing how we approach hygiene. Bamboo is a go-to for toothbrushes, utensils, fabrics, and even toilet paper—use these, then compost or recycle as appropriate.
- Agriculture: Mulch films, seedling pots, and feed bags made of biodegradable plastic or natural fibers help reduce farm waste. After use, these can often be composted onsite, enriching the soil and minimizing impact.
- Medical & Hygiene: Some medical gauze, gloves, and packaging are now made with biodegradable materials for single-use but low-impact solutions.
- Pet Products: Biodegradable poop bags, pet wipes, and bedding make it easy for pet owners to care for their animals without hurting the planet.
Whether it’s compostable resealable bags in the kitchen or seed-embedded greeting cards for special occasions, these materials offer low-effort swaps with a high impact. The key is to choose intentionally—focus on one category at a time, starting with what’s easiest for your lifestyle or business.
How to Properly Dispose of Biodegradable Materials?
Not all biodegradable materials break down the same way. Some need composting, others can go in the soil, and a few require industrial facilities.
To make biodegradable materials work the way they should, you need to dispose of them the right way. If you’re using cotton, wool, or silk, and they haven’t gone through heavy chemical treatment, you can toss them into your home compost pile. If your area offers textile recycling, that’s another great option.
You can recycle most paper and cardboard through your regular system. If they don’t have a plastic coating, you can also compost them at home without any problems. Think egg cartons, packing paper, or even seed-embedded greeting cards—these items break down quickly and enrich your soil.
When it comes to PLA or PHA, things get a bit more specific. These plant-based plastics only break down in industrial composting facilities. If you throw them into your backyard compost or the trash, they’ll stay around for a long time. You’ll want to check if your city has the right composting setup for these materials.
You can compost organic waste like fruit peels, coffee grounds, or veggie scraps right in your garden. That kind of waste disappears fast and feeds your soil.
If you’re working with jute, hemp, or bamboo, you can cut them up and compost them too. They may take a little longer, but they still break down and return to the earth, making them a win-win for both your home and your plants.
When you match each material with the right disposal method, you make sure nothing goes to waste. That’s how biodegradable packaging does what it promises—and why it matters.
Don’t Just Toss Biodegradable Materials Anywhere
It might be tempting to throw a “biodegradable” item into nature and expect it to vanish, but it’s not that simple. Biodegradation depends on very specific conditions—temperature, moisture, the presence of microorganisms—that aren’t always found in your backyard (or a random field).
There are actually several types of biodegradation:
- Marine environments: Some materials only break down in saltwater, with the help of marine microorganisms.
- Soil: Others are designed to degrade in soil, given the right mix of bacteria and fungi.
- Freshwater: Certain products need the unique conditions of lakes and rivers.
And when it comes to composting, there’s a difference between home composting (that slow, steady pile in your backyard) and industrial composting (a high-heat, professionally managed facility). Some products need the intense heat and controlled setting of an industrial plant to break down as promised.
You might see certifications like “OK Compost Home” or “OK Biodegradable Soil”—these labels tell you where and how a product will actually break down. Always check the packaging or ask your supplier for details if you’re not sure.
| Material | Disposal Method |
| Cotton, Wool, Silk | Home compost or textile recycling |
| Paper & Cardboard | Recycle or home compost |
| PLA, PHA Plastics | Industrial composting only |
| Organic Waste | Home compost or green bin |
| Jute, Hemp, Bamboo | Compost or natural burial |
Tips: Always check local regulations. Some items labeled “biodegradable” may not break down in landfills, especially if they’re coated or blended with synthetics. The right disposal method ensures the material breaks down fully and safely, so your efforts make the biggest impact.
And remember: being mindful of greenwashing is just as important. If something says “biodegradable,” ask yourself how and where it breaks down. Compostable materials should decompose within a reasonable amount of time in home or municipal compost settings.
Conclusion
Choosing biodegradable materials makes your brand cleaner, smarter, and more future-proof. If you’re ready to switch to packaging that breaks down naturally and speaks to your values, let’s talk.
At Gentle Packing, we help you create custom reusable bags and packaging solutions using materials that are both beautiful and easy on the planet. Reach out today and start building packaging your customers—and the Earth—will love.
FAQs
Q: How are avocados utilized for biodegradable packaging?
A: Avocado pits are turned into bioplastics used in cutlery, food containers, and packaging. They break down naturally and reduce agro-industrial waste.
Q: Is nylon biodegradable?
A: No. Nylon is a synthetic polymer that takes decades or centuries to decompose. It’s not considered biodegradable.
Q: Is PLA biodegradable?
A: Yes, but only in industrial composting conditions. It won’t break down properly in home compost or regular soil.
Q: Is toilet paper biodegradable?
A: Yes. Most toilet paper made from natural pulp is biodegradable and safe for septic systems.
Q: Is kitty litter biodegradable?
A: That depends. Some types of kitty litter are biodegradable, such as those made from corn, wheat, or recycled paper. Clay-based litter is not biodegradable.
Q: Is Styrofoam biodegradable?
A: No. Styrofoam is not biodegradable. It’s a petroleum-based plastic that breaks into microplastics and harms ecosystems.