Green360 Technologies has signed its first binding supply deal with Holcim Australia for up to 4,800 tonnes of MKX calcined clay over 12 months, targeting Victoria concrete operations amid fly ash and slag shortages.
Green360 Technologies (G360) has signed its first binding commercial supply agreement with Holcim Australia for MKX-CC, its calcined clay cement replacement. The deal covers up to 4,800 tonnes of MKX over an initial 12-month period for Holcim’s concrete operations in Victoria.
The Australian company began commercial production in April 2026 and estimates the 12-month agreement will generate between $1m and $2m in revenue. Holcim is its first binding commercial customer, following an extended technical evaluation of the material.
G360 secured commercial calcination capacity through an agreement with Calix and has completed its first commercial production campaign from its Pittong resource. It has already supplied MKX to infrastructure projects including Melbourne Airport Business Park, the Eastern Freeway Extension and the Suburban Rail Loop.
Calcined clays are supplementary cementitious materials that replace part of the clinker in cement, which cuts the CO2 in each tonne. Demand is rising because supplies of two traditional additives, fly ash from coal power and blast furnace slag from steelmaking, are shrinking as those industries decarbonise. That leaves concrete producers short of low-carbon inputs.
“We believe this agreement represents the first step in establishing G360 as a meaningful supplier into a market facing structural shortages of fly ash and blast furnace slag,” said executive chair Aaron Banks.
The volume is small against Australia’s cement market, but a binding order from a global producer moves G360 from development into commercial supply. For the wider sector, locally produced calcined clay is one of the few scalable answers to the loss of fly ash and slag, and a test of whether concrete buyers will pay for domestically made low-carbon materials.
