LabHEAT-Heating mantles for flasks, round bottom. Flask diameter 131 mm. 2 Heating ares. Designed identical to series KM-G, but the heating element is made of heat-resistant quartz yarn and permits a maximum temperature up to 900°C, 1,5m power supply (earthed) cable with heating-zone switch and RCD (residual current detection), nominal voltage 230V AC.