{"id":563,"date":"2026-10-21T15:00:59","date_gmt":"2026-10-21T07:00:59","guid":{"rendered":"http:\/\/www.trungtammuasamdongnhi.com\/blog\/?p=563"},"modified":"2026-10-21T15:00:59","modified_gmt":"2026-10-21T07:00:59","slug":"what-are-the-challenges-in-making-biodegradable-pet-cans-4219-b7ca3b","status":"publish","type":"post","link":"http:\/\/www.trungtammuasamdongnhi.com\/blog\/2026\/10\/21\/what-are-the-challenges-in-making-biodegradable-pet-cans-4219-b7ca3b\/","title":{"rendered":"What are the challenges in making biodegradable PET cans?"},"content":{"rendered":"

If you\u2019ve walked down any grocery store aisle in the last five years, you\u2019ve seen the shift: more and more brands are swapping single-use plastic bottles for aluminum cans, then turning to plant-based packaging as consumers demand less waste. As a PET can supplier, I\u2019ve been fielding a lot of questions lately about biodegradable PET cans\u2014questions from brand owners eager to hit net-zero targets, from retailers looking to cut their plastic footprint, and even from customers who\u2019ve heard \u201cbiodegradable\u201d and assumed it\u2019s just a fix for every packaging problem. PET Can<\/a><\/p>\n

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Let me start with something I tell every client who asks: we\u2019ve run our own small trial line for biodegradable PET cans for 18 months, and we\u2019ve nailed some parts, but we\u2019re still fighting to solve the core challenges that make this product far harder to scale than it sounds. The science behind \u201cbiodegradable PET\u201d isn\u2019t new, but applying it to a rigid, pressure-bearing can that has to hold soda, beer, or even liquid cleaners for six months before use? That\u2019s where the wheels start to fall off.<\/p>\n

First, let\u2019s get one thing straight: not all biodegradable PET is created equal. Traditional PET is polyethylene terephthalate, the same stuff that makes soda bottles and most plastic packaging. For it to biodegrade, you need to change its molecular structure so microbes can break it down, right? The most common approach is adding a pro-oxidant additive\u2014something that makes the PET oxidize in sunlight or heat, breaking long polymer chains into smaller pieces that bacteria and fungi can eat. On paper, this works: tests in industrial compost facilities show these modified PET can break down in 180 days, compared to 450+ years for regular PET. But here\u2019s the catch: that pro-oxidant doesn\u2019t care if it breaks down in a compost pile or on a store shelf.<\/p>\n

Last year, we supplied a test run of 5,000 biodegradable PET cans to a craft soda brand for a launch in California. Within two weeks, their regional distributor called in a panic: half the pallets of cans in their warehouse were cloudy, and some were starting to feel brittle around the seams. We traced it back to the pro-oxidant additive we\u2019d used in that trial batch. The cans were sitting in a 75-degree warehouse in the Central Valley, not the cool, controlled space we\u2019d stored them in during our internal tests. The heat sped up the oxidation process, so the cans were breaking down before they even got filled. Brand owners didn\u2019t just lose money on that batch\u2014they lost trust, and that\u2019s a hard thing to rebuild.<\/p>\n

That\u2019s the first big challenge: balancing shelf stability with biodegradability. For a standard PET can, we\u2019re working with a material that\u2019s meant to last. It has to resist oxygen, keep carbonation in soda, keep light out, and hold up during shipping and storage. When you add pro-oxidants, you\u2019re basically priming the plastic to break down, but you have to time that breakdown to happen only after the can has served its purpose. That\u2019s not a simple adjustment. We\u2019ve experimented with different additive levels, with coating the inside of the can to slow oxidation, with even blending in small amounts of biopolymers like PLA\u2014but every tweak has a tradeoff. Add too much barrier coating, and the microbes can\u2019t reach the polymer chains to break it down. Add too little, and the can fails before it hits the shelf.<\/p>\n

Then there\u2019s the issue of mechanical strength, especially around the can\u2019s most critical part: the end. The lid of a PET can is crimped on, has a pull tab, and has to seal tight enough to hold pressure\u2014especially for carbonated drinks. Regular PET cans have a tensile strength that\u2019s been refined over decades; we know exactly how thin we can make the wall, how strong the crimp needs to be, what temperature it can handle. When we switch to biodegradable PET, we\u2019re modifying the polymer structure, and that changes its tensile properties. We ran drop tests on our trial cans last month; a standard 12-oz PET can will bounce and roll without denting even when dropped from three feet. Our biodegradable version? One out of every eight cans cracked on impact, and that\u2019s a problem\u2014no brand wants to ship a can that leaks before it even gets to the store.<\/p>\n

We\u2019ve also run crimping tests, and the biodegradable PET is more prone to cracking along the seam where the lid attaches. The manufacturing equipment we use to crimp cans is calibrated for regular PET, so when we run biodegradable material, we have to slow down the line, adjust the pressure on the crimpers, and even replace some parts of the machine. That means lower output per hour, higher machine maintenance, and more waste during production\u2014all of which add up to a product that\u2019s 20-30% more expensive than regular PET cans right now. For small brands that operate on thin margins, that\u2019s a non-starter.<\/p>\n

Another challenge that almost no one talks about: compatibility with fill processes and food safety. PET cans are used for everything from sparkling water to craft beer, and each brand has their own fill specifications. We had a client last year who wanted biodegradable PET cans for their cold brew coffee, which has a slightly acidic pH. In small-scale tests, the biodegradable PET worked fine, but when they filled 10,000 cans on their commercial line, the cans started to absorb small amounts of the coffee\u2019s acids. Over a two-week period, the taste of the coffee changed\u2014something we didn\u2019t catch in our initial tests because we\u2019d only tested with distilled water, not actual product. Food safety is non-negotiable here; we can\u2019t supply a can that leaches chemicals or changes the taste of what\u2019s inside. We\u2019ve had to spend months working with food scientists to adjust the inside coatings so they\u2019re compatible with a wider range of beverages, and we\u2019re still not where we want to be.<\/p>\n

Then there\u2019s the end-of-life piece, which is part of the confusion around \u201cbiodegradable\u201d packaging. A lot of consumers think a biodegradable PET can will break down in their backyard compost, or even in a landfill. That\u2019s not the case. Industrial compost facilities require specific conditions: high heat (130-170 degrees Fahrenheit), consistent moisture, and the right mix of microbes. Most landfills are compacted and oxygen-poor, so even biodegradable plastics just sit there, same as regular PET. Backyard compost? The temperature rarely gets high enough, so the can will break down over decades, not months. We\u2019ve had clients get pushback from customers who thought our biodegradable cans would decompose in their home gardens, and that\u2019s a conversation we can\u2019t win\u2014especially when the science doesn\u2019t support it. We\u2019ve had to become educators, too, and that\u2019s an extra layer of work that most suppliers don\u2019t prepare for.<\/p>\n

I\u2019m not saying it\u2019s impossible, though. We\u2019re still investing in this, because the demand is real. Last quarter, we got three separate inquiries from major beverage brands that want to switch to biodegradable PET cans for their national rollouts. We\u2019re working with a new additive manufacturer that\u2019s developed a pro-oxidant that triggers degradation only when exposed to industrial compost conditions, not regular room temperature. We\u2019ve redesigned the can\u2019s wall thickness and the crimping process to improve tensile strength, and we\u2019re testing new food-grade coatings that are compatible with 90% of the common beverages we work with.<\/p>\n

But here\u2019s the thing: we\u2019re not there yet. We can make a biodegradable PET can that works in small batches, in controlled conditions, for specific products. We can\u2019t yet make one that works for every brand, every fill line, every supply chain, and every end-of-life scenario at a price that makes sense for consumers. That\u2019s the hard part\u2014scaling a product that\u2019s still in the trial stage, without cutting corners on safety, performance, or sustainability.<\/p>\n

A lot of people in the packaging space act like biodegradable is a magic bullet. It\u2019s not. It\u2019s another material that has its own set of tradeoffs, same as aluminum, same as glass, same as regular PET. As a supplier, I can\u2019t just sell you a \u201cgreen\u201d product and walk away. I have to be honest about what it can do, what it can\u2019t do, and what it will cost\u2014now and in the future.<\/p>\n

If you\u2019re a brand owner looking to make the switch to more sustainable packaging, I\u2019d encourage you to ask the hard questions. Don\u2019t just take \u201cbiodegradable\u201d at face value. Ask about shelf stability: how long will the cans last in a warehouse at 75 degrees? Ask about mechanical strength: have they passed drop and crimp tests for your product? Ask about food safety: have they been tested with your specific beverage? And ask about end-of-life: what facilities can actually process these cans, and will your customers understand how to dispose of them correctly?<\/p>\n

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We\u2019re still solving these problems, but we\u2019re making progress. And if you\u2019re looking for a supplier that\u2019s willing to work through the challenges with you, that\u2019s transparent about the hurdles, not just the hype, let\u2019s connect. We can run small trials, adjust the material to fit your needs, and build a solution that actually works for your brand and for the planet.<\/p>\n

Paper Cup<\/a> References<\/p>\n

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  1. European Bioplastics. (2022). Biodegradable Polymers: Types, Applications and End-of-Life Considerations.<\/li>\n
  2. Plastic Industry Association. (2021). Performance Characteristics of Modified PET for Biodegradable Packaging.<\/li>\n
  3. Food and Drug Administration. (2020). Food Contact Substances for Biodegradable Plastic Packaging.<\/li>\n
  4. Journal of Packaging Technology and Science. (2023). Mechanical Properties of Rigid Biodegradable PET Containers.<\/li>\n
  5. Composting Council. (2022). Industrial Compostability Standards for Plastic Packaging.<\/li>\n<\/ol>\n
    \n

    Wuhan Xinyongan Industry and Trade Co., Ltd.<\/a><\/p>\n

    Address: No. 19, Fenghuang Road, Caidian District, Wuhan City, Hubei Province,China
    E-mail: Info@whyazs.com
    WebSite:     https:\/\/www.ipackpartner.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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