https://www.avient.com/knowledge-base/case-study/led-manufacturer-innovates-and-saves-polymer-heat-sinks
The company’s product engineers developed specifications that included thermal conductivity in plane from 4 to 21 W/m.K (in compliance with ASTM E1461); glow wire resistance of 850°C/0.8mm (IEC 606095-2-12); and enough dimensional stability to allow it to be overmolded directly on LED components.