For flasks, round bottom. Flexible glass yarn heating element in plastic coated, chemical-resistant metal casing with built-in mains and heating zone switch. Max. heating element temperature 450 °C. 1.5 m power supply (earthed) cable and residual-current circuit-breaker. Mains supply: 230 V AC. For flasks, round bottom. Flexible glass yarn heating element in plastic coated, chemical-resistant metal casing with built-in mains and heating zone switch. Max. heating element temperature 450 °C. 1.5 m power supply (earthed) cable and residual-current circuit-breaker. Mains supply: 230 V AC.