Heat-On 100 ml Block P/N: 505-80066-00 This Heat-On Block is suitable for 100 ml multineck flasks, as the lateral recesses were designed for this purpose. The maximum temperature for continuous use is 260 °C. In order to measure this precisely with a temperature sensor, a small hole is provided on one side of the Heat-On Block. For comfortable and safe transport of the Heat-On Blocks - especiall..