Designed for use when high temperatures are encountered in the welding process, such as pre & post-heating. They are heat resistant up to 350°c for up to 24 hours and 500°c for short periods. Mirroring the features of the standard range of inflatable purging systems, the heat-resistant range comes with a luminous positioning band for rapid centring and set-up. These systems can be in place throughout the pre-heating, welding and post-heat treatment cycles, allowing the weld to be purged continuously for up to 24 hours if necessary.