Green Critical Minerals (ASX: GCM) has confirmed its very high density (VHD) graphite technology to be an effective thermal management innovation with exceptional conductivity and diffusivity results from independent like-for-like testing at the University of New South Wales.
The tests showed VHD could achieve a thermal conductivity of 422 Watts per meter-Kelvin (W/m·K), outperforming conventional materials such as copper (at 328W/m·K) and aluminium (142W/m·K), while offering thermal diffusivity 2.9 times better than copper and 4.6 times better than aluminium.
The results prove VHD can remove heat from a heat-generating source better than conventional materials – thermal conductivity – while offering a lighter, more efficient, and cost-effective alternative for the next-generation cooling demands of data centres, high-performance computing, and power electronics.
Closer to Commercialisation
“This final round of testing marks a significant milestone in the commercialisation of our VHD technology and products, confirming its ability to revolutionise high-performance thermal management,” managing director Clinton Booth said.
“These results — along with excellent feedback received from customer testing — further support our belief that VHD technology will become a leading thermal management product as we move through the final stages of commercialisation.”
Mr Booth said Green Criticals had made impressive progress and exceeded the milestones the company had set.
“[These] include validating the superior thermal performance of VHD, moving from pilot plant to an operating production plant, moving through the customer qualification process, and introducing VHD to global customers for testing of samples,” he said.
“All of this supports our targeted first revenue in the first half of calendar year 2026.”
Conductivity vs Diffusivity
Thermal conductivity measures how readily a material conducts heat, or how well heat flows from and through materials, while thermal diffusivity measures how fast a material’s temperature can change in response to a heat input, or how quickly heat dissipates through a material.
In practical terms, thermal conductivity drives steady state heat flow, whereas thermal diffusivity drives dynamic heating and cooling performance as demand is placed on the power device.
Mr Booth said it was the combination of “superior and exceptional” thermal conductivity and diffusivity that sets VHD apart from copper and aluminium.
“VHD removes heat from a heat-generating source and addresses dynamic heat demands better than conventional materials and we are confident it will eventually become a market-leading mass production thermal management material,” he said.
“Our test results provide further validation of the significant opportunities for VHD in the US$2 trillion global technology and electronics market.”
