What is the ideal hot-air temperature for welding the Fatrafol 810/V waterproofing membrane?

The welding window for PVC membranes is quite wide — roughly from 480 °C to 600 °C. Before welding, we recommend determining the optimal temperature with a test seam by adjusting the welder's temperature, feed speed and pressure-roller load, while also taking the outside temperature into account. Start at around 520 °C and find the limit values at which the membrane already burns or, conversely, at which the seam no longer holds and peels apart. This way you will obtain the real welding window; the optimal welding temperature lies in the middle of this range. Note that it may change during the day as the surrounding air temperature rises.