This is a sample case study illustrating the kind of project write-up that will appear here — replace with details from your own work.
Marine-recovered plastic is one of the hardest waste streams to upcycle: it's a mix of polymer types, heavily weathered by UV and salt exposure, and often contaminated with sand, biofilm, and other debris. A recent project set out to answer a specific question — could this material be reinforced into a structural composite panel, rather than downcycled into low-grade filler?
Characterizing the feedstock
The first step was understanding what we actually had. Sorted batches were analyzed to identify polymer types present (predominantly polyethylene and polypropylene, with minor contamination from PET and nylon fishing line fragments), along with degree of UV degradation via melt flow index and molecular weight testing. This characterization step is where most upcycling projects succeed or fail — you can't design a process for a material you haven't measured.
Process design
Given the polymer mix and degradation level, a pure mechanical reprocessing approach wasn't going to hit structural performance targets on its own. The process that emerged combined three elements: a compatibilizer system to stabilize the mixed PE/PP blend, chain-extending additives to partially recover molecular weight lost to UV degradation, and reinforcement with recycled glass fiber to reach the target flexural strength.
Results
The resulting composite panel met flexural strength and stiffness targets within range of standard glass-reinforced polypropylene sheet, at a substantially lower material cost than virgin-resin alternatives. Consistency batch-to-batch remains the main ongoing challenge, given the inherent variability of ocean-recovered feedstock — an area of continued process refinement.
Takeaways
- Mixed, degraded feedstocks can still hit structural performance targets — but usually need a combination of methods, not one silver-bullet process.
- Upfront characterization work is what makes the rest of the process design possible.
- Batch-to-batch consistency, not peak performance, is often the harder engineering problem with recovered ocean plastic.
Working with a difficult or highly mixed waste stream? Let's talk about it.