Type X Fiber Loading and Slurry Rheology

Adding chopped E-glass fiber to a slurry at 0.4–0.7% bwoc shifts the rheology in a non-linear way. Apparent viscosity rises faster than dose, the slurry becomes more shear-thinning, and the mixer's effective residence time increases.

Plants converting from a standard core to Type X often underestimate this and end up with edge defects and uneven density. The fix is usually a small bump in dispersant dose (3–8% relative) and a recheck of the foam survival across the longer effective transit.

Specify silane-sized fiber. Unsized fiber rolls on the slurry surface and creates surface defects.