Recycled polymers have significantly lower carbon footprint than oil-based virgin plastics – up to 89% for ABS – according to latest research by Axion Polymers.
The Manchester-based plastic recycler’s 2017 Axpoly Carbon Footprint Analysis also reveals a carbon saving of 82.5% for recycled HIPS and 73% for recycled PP.
According to Axion, the CO2 savings are large. Its team calculated that using just one tonne of Axpoly ABS instead of virgin material to make goods would give a saving of 3,380 kgs of CO2 – equivalent to a 40ft articulated lorry transporting the material 2,272 miles. On one full-load, the same lorry could be driven 45,500 miles or almost twice round the world on the equivalent CO2 savings.
Axion Polymers produces three types of recycled polymer from its advanced reprocessing plants for Automotive Shredder Residue (ASR) derived from End of Life Vehicles (ELV) and WEEE. These are Axpoly PP (polypropylene), ABS (Acrylonitrile Butadiene Styrene) and HIPS (high impact polystyrene) and are the most common plastics used in the automotive and E&E markets over the past 15 years.
The Axpoly polymers can be used as a direct replacement for virgin polymer, or combined with virgin polymers to produce a high-grade polymer with recycled content that can be used in demanding applications.
The new study was prompted by recent investment in more efficient separation processes and improving throughput that has increased the yield of finished polymers. Axion based its methodology on the similar process stages to making oil-based polymer from crude oil to allow a direct comparison between the process routes and resulting carbon emissions.
Calculations were done by Axion head of engineering & research Richard McKinlay. He said: “These ‘new metrics’ of the circular economy are the numbers that need to be considered by designers and specifiers of polymer materials when selecting plastic for use in new parts and components on all types of consumer goods and vehicles.”
Axion director Keith Freegard added: “What we’ve confirmed is that as our process technology has developed, our throughput has increased, our efficiency has improved and our power consumption per unit output has got much better with lower wastage and better yield; then that all pays off in an improved carbon footprint per tonne of output product.”
“This proves to me that actually using a carbon footprint metric is a really good way of tracking if your process is an efficient conversion of waste into finished product.”