Green360 Technologies (ASX: GT3) has achieved a major milestone with the University of Melbourne independently verifying its Eco-Clay product as meeting the Australian Standard for supplementary cementitious materials.
The commercial-scale trials confirm Eco-Clay’s performance equals or exceeds leading international metakaolins, marking a breakthrough in sustainable construction materials.
Executive chair Aaron Banks said the development “represents exactly what Green360 stands for – practical circular economy innovation that creates value from waste, reduces emissions, and delivers real commercial results.”
High-Performance Circular Economy Product
Eco-Clay is a calcined kaolinite (metakaolin) product Green360 derives from tailings and settlement pond residues at its Pittong kaolin operations in Victoria.
By converting this by-product into a high-reactivity pozzolan that can replace up to 40% of Portland cement in concrete, the company is targeting substantial reductions in embodied carbon.
Independent testing confirmed Eco-Clay achieved 96% kaolinite conversion efficiency, with mortars containing 20% Eco-Clay substitution matching or exceeding control mixes for compressive strength at 3, 7 and 28 days.
The material demonstrated reactivity and fineness consistent with Grade 1 classification, positioning it alongside leading global metakaolin products.
Its high performance, combined with extremely low marginal cost—due to being sourced from Green360’s own process tailings—provides a significant competitive advantage for scaling into both industrial and retail markets.
Major Market Opportunity in Low-Carbon Cement
With the cement sector responsible for about 8% of global CO₂ emissions, Green360 sees strong potential for Eco-Clay in Australia’s $3.2 billion cement market and the broader global drive toward net-zero construction.
The company noted that Eco-Clay’s domestic production and “drop-in” compatibility with existing cement formulations make it a viable, sustainable substitute at commercial scale, as traditional supplementary cementitious materials such as fly ash and slag face supply constraints due to a decline in coal-fired power generation.
Green360 is in advanced negotiations to produce Eco-Clay through a toll treating facility to enable near-term market supply, and is also working with major and independent concrete producers to conduct production-scale trials across ready-mix and precast applications.
Mr Banks said Green360’s first-mover advantage and structural cost base position it “as one of the most cost-effective and environmentally responsible building material producers in the world.”
