The PTFE safety cover ensures even more safety for every application with a Heat-On Block for a 200 - 300 ml round bottom flask. Despite the reduced danger when using Heat-On Blocks compared with a conventional heating bath, the risk of burns is not zero. We therefore recommend using a safety cover made of chemical-resistant, easy-to-clean PTFE. Also available for other Heat-On Block sizes. The PTFE safety cover ensures even more safety for every application with a Heat-On Block for a 200 - 300 ml round bottom flask. Despite the reduced danger when using Heat-On Blocks compared with a conventional heating bath, the risk of burns is not zero. We therefore recommend using a safety cover made of chemical-resistant, easy-to-clean PTFE. Also available for other Heat-On Block sizes.