GRAPHITE FILLED POLITEF® PACKING-BOX It is a leakage element with square cross-section, which is knitted from thin POLITEF cord strings knitted as diagonal knitted type. It can be used between -260°C/+260°C temperature intervals. It is used in order to provide non-leakage between the active pieces. It is elastic due to its diagonal knitted structure and also it is a very resistant material due to its low friction coefficient.