Void Filling - POLY-MOR's process for void-filling employs an array of special high density expanding polymers which are injected through small 5/8” holes drilled directly through the concrete slab. As the resin mixture expands, voids are filled and a controlled mold pressure is exerted on a limited (8 to 10 foot diameter) area. The aggressive nature of our resins not only effectively fill voids under concrete slabs but also effectively under-seal the slabs and helps in preventing water infiltration. Our hydro-insensitive polymer resins work equally effectively in filling voids in wet sub-strates. The composite material quickly cures to a strong, stable and long-lasting replacement base material. Once our crew has completed their work and left the work area, the treated area is immediately ready for normal traffic use.