In most recycling systems, soft plastics are a problem. They tangle machinery, contaminate paper streams, and rarely find a viable second life. For years, the default destinations have been landfill or export.
At SupaCell, we saw something different. We saw a functional material hiding in plain sight.
Through years of research and development, we found a way to repurpose soft plastics as a binding agent within our insulation. What was once a contaminant became a core ingredient in a high-performance, Australian-made product.
This article explains the science behind that transformation, and why it matters for Australia’s recycling future.
Why Soft Plastics Are Australia’s Hardest Recycling Problem
Australia’s plastic challenge continues to grow. According to the Australia Institute, only 14 percent of plastic waste is currently kept out of landfill, and national plastic consumption is projected to more than double by 2050.
Soft plastics sit at the heart of this problem. Bags, wrappers, and flexible packaging are lightweight, low in value, and difficult to sort. Data from the DCCEEW shows plastic waste reached 3.2 million tonnes in 2023–24, with 39 percent coming from packaging.
Collection is only half the battle. As soft plastics processing scales back up across Australia, the critical challenge is demand. Recovered material needs reliable, long-term end markets, as highlighted in recent ABC News coverage.
That is exactly where SupaCell fits.
From Contaminant to Component
Every insulation batt needs something to hold its fibres together. In many conventional products, that job is done by virgin binders, including low-melt polyester manufactured specifically for the purpose.
We asked a different question: What if recovered soft plastics could do that job instead?
The answer sits at the core of the SupaCell innovation. In our process, soft plastics are repurposed as part of the binding agent, replacing a portion of the virgin low-melt polyester and adding functional value to a material most systems reject.
The result is a batt where the binder itself carries a recycling story:
- Mixed paper and cardboard form the structural core, delivering strength and thermal stability
- Soft plastics act as the bonding element, reducing the need for virgin materials
- Every fibre is locally sourced, collected, and reimagined into a product that closes the loop
For a closer look at where this idea began, read here: Building the Future, One Fibre at a Time: The SupaCell Story of Australian Innovation
The Role of Low-Temperature Bonding
The binding process relies on heat, but far less than you might expect.
Our nonwoven manufacturing line blends cellulose fibres and processed soft plastics into a consistent mat. The ovens operate at around 160°C, which is enough to activate the plastic binder and lock the fibre structure in place.
Compare that with traditional glasswool production, which requires temperatures of around 1500°C to melt glass. The difference in energy demand is enormous.
This low-temperature approach delivers several benefits:
- Lower energy consumption during manufacturing, reducing embodied carbon
- Preserved fibre integrity, since the cellulose is bonded rather than degraded
- Consistent batt formation, with uniform density and reliable recovery to full loft
Getting this right took extensive trial and refinement. To understand how the machinery was adapted for Australian materials, read here: Inside the Machine: How Nonwoven Technology Turned Kerbside Waste into SupaCell Insulation
Taming a Variable Material
Soft plastics are not a uniform input. They arrive with different compositions, melting points, and levels of consistency, which is precisely why most manufacturers avoid them.
Our development process treated this variability as an engineering problem to be solved, not a reason to walk away. Blends were trialled, feed systems were redesigned, and processing parameters were repeatedly tested and refined.
Working closely with iQRenew, feedstock quality was studied in detail. Improvements at the recycling stage informed adjustments on the manufacturing line, creating a feedback loop between processing and production.
The outcome is a system designed to deliver consistent performance from variable recycled inputs. That capability is what allows circular manufacturing to work at commercial scale.
For more on how that partnership took shape, read here: Engineering the Circular Economy: How Regional Collaboration Redefined Manufacturing
Proof You Can See
Look closely at a SupaCell batt and the story reveals itself. You may spot faint fragments of print, a trace of cardboard, or the familiar yellow of a Curby soft-plastics collection bag.
These are not imperfections. They are proof of purpose.
Every visible fleck connects the finished product back to a household recycling bin. It makes the circular economy tangible, something builders and homeowners can literally see and touch in their own walls and ceilings.
Creating a Stable End Market for Soft Plastics
Recovery alone does not solve Australia’s soft plastics problem. Without reliable demand, collected material risks stockpiling, export, or a return to landfill.
By converting soft plastics into a long-life building product, SupaCell creates a stable, ongoing end market. Insulation stays in service for decades, locking recovered material into productive use rather than short-term cycles.
This is circularity in action. A material that once had nowhere to go now helps insulate Australian homes, reduce energy bills, and keep value within regional communities.
We believe it is proof that the hardest recycling problems can also be the biggest opportunities.
Have questions about this article, or anything else about SupaCell? We would love to hear from you. Get in touch with our team today.