Turning recycled tyres into pipes

Geelong-based manufacturing companies Polymeric Powders and Austeng are using end-of-life tyre crumb combined with polyolefin plastic to manufacture a high-quality composite material, enabling the production of commercial pipes using an innovative process.

Austeng and Polymeric Powders joined forces on the project following a Geelong Council business development event. Since then, the two companies have been working on perfecting the manufacturing process that turns tyre crumb into a material for the manufacture of high-quality pipes for a range of industrial uses.

The patented Polymeric Powders technology converts rubber crumb, sourced from end-of-life tyres, into a modified rubber powder that can be chemically bonded with other materials. The technology allows the recycled material to be used as a composite in a wide range of applications, including in industrial tools and components, building and construction, mining, oil and gas, irrigation and sewerage, automotive, aerospace and flexible electronics. The composite material also has very desirable properties when compared to traditional plastics, including increased shock absorption (vibration damping), resistance to cracking, thermal insulation and acoustic insulation.

The pipes produced have passed stringent standard performance tests for non-pressure pipe applications, such as irrigation and sewerage. The tests included cold bending and straightening and impact testing ranging in temperatures from 0–50°C.

The new material can be utilised in traditional moulding and extrusion processes, offering opportunities for its use in a global injection moulded plastics market that is expected to reach US$252 billion in 2018. The material has also been produced in a filament form for use in 3D printing, positioning it well in one of the fastest growing industrial manufacturing processes. It thus has the potential to develop markets at both a national and international level.

Tyre Stewardship Australia (TSA) has been central to funding research and testing focused on proving the performance of the product. With the help of TSA’s R&D fund, the work of the two companies offers the potential not only to recycle a significant quantity of tyres, but to create a new industry with opportunities for the skilled manufacturing base that has developed in Geelong over decades of automotive manufacture.

Pictured: A composite pipe from recycled tyre rubber used in citrus irrigation.