Mechanically strong yet metabolizable plastic breaks down in seawater

Coatings, Food Safety, and Heat Limits

• Many are wary that “biodegradable” or new plastics will just be coated with problematic hydrophobic layers (PFAS, parylene C, unknown lacquers).
• Food-safe waxes, soybean wax, mineral oil, shellac, and vegetable oils are discussed; each has issues with hot food, melting above ~50°C, chemical solubility, or being petroleum-derived.
• Several anecdotes note people unintentionally ingesting coatings; others point out that many food-contact substances (waxes, flavors, pill coatings) are already petroleum-derived.
• Debate over real-world temperatures: some argue >50°C is rare for practical use, others cite hot climates, car interiors, and concentrated solar reflections reaching extremely high surface temperatures.

Packaging Alternatives and Lifestyle Changes

• Glass, metal, wood, bamboo, and coated paper are suggested; drawbacks include weight, fragility, cost, and soup/leak issues.
• Some propose bringing personal containers for leftovers or bulk foods; others see this as impractical, especially without cars or with busy lives.
• Food-safety regulations and liability make reusing customer containers difficult for restaurants and supermarkets.
• There is concern that many “biodegradable” paper/board food containers still rely on PFAS or similar chemistries.

Biodegradable Plastics and Ocean Nutrients

• Some worry that “metabolizable” plastics will add nutrients to water and worsen dead zones; others note that typical plastics are mostly C/H and not the limiting nutrients.
• This specific material involves nitrogen- and phosphorus-containing compounds, which are acknowledged as potential eutrophication risks if used at scale.
• Magnitude of impact compared with agricultural runoff is debated and remains unclear.

Greenwashing, Economics, and Policy

• Multiple commenters see repeated announcements about biodegradable plastics as greenwashing that rarely scales or displaces conventional plastics.
• Strong sentiment that real solutions require less single-use plastic, more reusable options, and systemic changes, not just new materials.
• Discussion highlights fossil-fuel subsidies and unpriced externalities as key reasons plastics are so cheap; there is disagreement over the size and definition of “subsidies.”
• Opinions diverge on using taxes vs. subsidies to internalize environmental costs, and on political feasibility given public sensitivity to price increases.

Technology, Performance, and 3D Printing

• Some argue toxic or petrochemical-based materials remain dominant because they are cheaper and higher performing.
• Calls focus on “sustainable plastics production” (e.g., from biomass) rather than abandoning plastics altogether.
• The plastic being thermoplastic raises interest for 3D printing, but cost and real-world performance are unknown; existing PHA filaments are mentioned as a current biodegradable option.