Resin Saturation
Woven E-glass cloth specified as glass weave 1078 provides a thin foundational reinforcement for multilayer printed circuit boards. Resin impregnation fills the interstitial spaces of the fabric during prepreg production to establish a uniform dielectric layer. Spreading individual filaments reduces yarn bundle thickness and creates a flat profile for high density interconnect fabrication.
Electrical performance depends on consistent resin content and uniform thickness across the dielectric substrate.
Dimensional Stability
Thermal expansion coefficients along the x and y axes remain tightly controlled during multilayer lamination cycles. Glass weave 1078 restricts resin flow during high pressure presses to prevent internal layer displacement and registration errors. Residual stress accumulation within the core material directly influences copper foil adhesion and etching precision.
Subsequent thermal excursions during component soldering require reliable planar stability to avoid conductor cracking.
Signal Propagation
Relative permittivity values vary according to the exact ratio of glass reinforcement to cured epoxy resin in the dielectric core. Glass weave 1078 determines impedance stability for high frequency transmission lines routed through inner layers. Dielectric thickness tolerances govern insertion loss performance across broad frequency spectra in high speed digital hardware.
Impedance matching relies entirely on the precise volumetric fraction established by this specific reinforcement style.
