Plastic will not be replaced by a single material. This premise simplifies a problem that is actually a set of completely different problems: food packaging that needs a moisture barrier, disposable cup that needs to be rigid for a few hours, protective foam that cannot weigh down or soften during logistics, flexible film that needs to be vacuum sealed. Each application has specific performance requirements, and the replacements that are emerging are not universal — each solves a slice of the problem. Understanding which material solves which application, at what cost and with which end-of-life infrastructure, is the exercise that most packaging and consumer goods companies have not done with enough rigor.
Bioplastics: the problem is not chemistry
PHA and PLA are the two most commercially developed bioplastics. Both are compostable, both have real applications, and both have the same fundamental problem: end-of-life depends on infrastructure that doesn't exist at the necessary scale. PLA is compostable under industrial conditions — temperature above 60 degrees Celsius and humidity controlled for weeks. Thrown into landfills, it behaves like conventional plastic. Dumped in household compost, it does not degrade within the expected time in most climates. The practical result is a material that has the compostable label but whose environmental benefit depends on an industrial collection and composting chain that, in Brazil, exists in less than 5% of municipalities.
PHA has advantages over PLA in this regard — it is biodegradable in wider environmental conditions, including soil and seawater — but the production cost is between two and four times that of PLA, which in turn already costs between two and three times the price of conventional polypropylene. The cost of PHA has fallen with the increase in capacity of players such as Danimer Scientific and CJ BIO, but parity with petrochemical plastics is not yet a short-term prospect. The economic argument for PHA today depends on product premiums — buyers paying more for the biodegradability attribute — and regulations that make conventional plastic more expensive via environmental impact fees or use restrictions.
Micelium: from the laboratory to the packaging shelf
Mycelium — the network of fungal filaments — is one of the most surprising materials in terms of its speed of commercialization. Ecovative, a North American company founded in 2007, already supplies mycelium packaging to Dell, IKEA and Sealed Air. The process is simple in concept: agricultural waste — wheat straw, rice husks, sugarcane bagasse — are mixed with fungus spores, placed in molds, and after a few days of growth they have the desired structure. Mycelium binds plant fragments into a composite that can be dried to stop growth and has mechanical properties close to polystyrene foam for cushioning applications.
The cost is still higher than EPS, but in applications with high unit value — consumer electronics, industrial equipment — the difference in packaging cost is irrelevant given the value of the protected product. And the marketing argument for premium brands is genuine: packaging is visibly different and communicates environmental commitment in a tangible way, not with a recycling symbol on the bottom of the box. Italian company Mogu extends the concept to acoustic insulation panels and wall coverings, showing that mycelium is not just a solution for packaging.
The limitation of mycelium is humidity performance — fungus-based materials absorb water and lose mechanical properties in humid environments without additional treatment. For moist food packaging or exposure to weather conditions, the material would require coating or treatment which complicates the biodegradability argument.
Algae and bacterial cellulose films
Materials derived from algae and bacterial cellulose are at an earlier stage of commercialization, but with clear applications in specific segments. Algae-based films have barrier properties that make them candidates for replacing plastic films in sachets and individual food packaging. Notpla, a British company, has already produced edible sauce capsules — the packaging is part of the product, without residue. The challenge for scale is the algae supply chain with consistent quality and volume, and the sensitivity of the material to processing and storage conditions.
Bacterial cellulose — produced by bacteria such as Komagataeibacter xylinus in a fermentation medium — generates a material with high purity, transparency and mechanical properties superior to paper, with the potential to replace transparent PET films in applications that do not require a gas barrier. The production cost is still high because the fermentation process is slow and the yield per liter of culture medium is low. But companies like Scoby and Nanollose are working on process optimization that could change this equation in the next five years.
What Packaging and Consumer Goods Companies Should Do Now
Regulatory pressure on single-use plastic is real and growing. CONAMA Resolution 498/2020 and Law 14,026/2020 created progressive obligations for recycling and reducing plastic. The European SUP directive has already banned a number of single-use plastic items and serves as a reference for where Brazil tends to go. Companies that wait for regulation to be fully implemented to start testing substitutes will arrive late to the market and without learning.
The exercise that makes sense to do per specific application has four variables: performance of the substitute versus original plastic in the technical requirements of the application, current cost of the substitute and expected cost trajectory over the next three to five years, end-of-life infrastructure available for the substitute in the target market, and customer perception of the environmental attribute. Not every substitution closes on all four. In secondary packaging of a premium product, mycelium closes. In low-cost foodservice condiment sachet, not closed yet. Knowing where to close and where not to close is more valuable than having a generic position of commitment to sustainability.
The risk of making a decision to replace material without this mapping is replacing one problem — plastic — with another, like the confusion that the PLA created in the compostable packaging market, where consumers discard organic waste because they see "compostable" on the packaging, and the material goes to landfill anyway. A sustainability credential that is not sustained throughout the entire life cycle is a reputational liability, not an asset.
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