Loss factor is the product of the dissipation factor and the dielectric constant of an insulating material, indicating how much signal energy the dielectric absorbs.
Loss factor combines two properties of an insulation into a single value: the dissipation factor, which reflects how much energy the dielectric absorbs and converts to heat, and the dielectric constant, which describes its ability to store electrical energy. Their product indicates the overall energy loss the dielectric introduces. As a combined figure, it offers a convenient way to compare the loss behavior of different insulating materials.
In commercial and industrial cable, a low loss factor is desirable because it means the insulation absorbs less signal energy, preserving signal strength and quality over the run. The effect becomes more significant at higher frequencies, where dielectric losses can meaningfully reduce performance. Engineers compare loss factors when selecting insulation for high frequency and signal applications, where preserving the signal is a priority.
Because the effect compounds over distance and frequency, a difference in loss factor that seems minor on a short bench test can become significant across a long installed run carrying high frequency content, making material choice an early design decision.
Accounting for loss factor early in a design helps avoid surprises once a cable is carrying real signals over its full installed length.
At Windy City Wire, the focus on engineered low-voltage cable involves attention to dielectric properties like loss factor that influence signal performance. Selecting insulation with favorable loss characteristics helps ensure that cable delivers strong, clean signals in demanding commercial communication and AV systems.