Being applied over the individually insulated conductors, arranged in a particular pattern, dielectric binding multiplies cumulative dielectric attributes of the cable composition. SDB (Standard Dielectric Binding) is a 2-layer bi-directional X-Cross PTFE tape overlaying process. It is currently used in some Special cables.
SASDB® (Semi-Air-Spaced Dielectric Binding, patent RU No.144590U) is a 4-layer bi-directional X-cross PTFE tape overlaying, where each successor winding of the 3 opposite inner layers is set with an air gap and the final layer completed with a 30% overlay. This sophisticated method ensures a strikingly low signal energy loss thanks to the solid material being partially replaced by air spacing, with extremely low and frequency independent relative permittivity. Furthermore, due to the ease of mechanical interlayer tensions, vibrations are absorbed efficiently and better flexibility is obtained. Different SASDB® versions are used primarily in Classic, Reference & Ultimate cables.